Title of Invention

A QUADRATURE MIXER ARRANGEMENT

Abstract A quadrature connected passive mixer arrangement for frequency converting analog signals from a first to a second frequency. The arrangement comprises two parallel connected mixers provided as transistors. First and second LO signals and their inverse signals having separated phases are provided for driving the transistors. Signal path switches are provided between the RF terminals and the mixer transistors. The switches are driven by signals having a different phase than the signal driving the corresponding mixer transistor. Thus, any short circuit between IF terminals- of the arrangement may be eliminated.
Full Text FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10, rule 13)



&L"MBM.i$^

"MIXER ARRANGEMENT"

TELEFONAKTIEBOLAGET LM
(PUBL), of S-164 83 Stockholm, Sweden

ERICSSON

The following specification particularly describes the invention and the manner in which it is to be performed.

WO 2005/060089 PCT/EP2004/013000
2
MIXER ARRANGEMENT
Technical Field of the Invention
The present invention relates to an arrangement for 5 mixing analog signals, and more particularly to a mixer arrangement for converting a first signal having a first frequency to a second signal having a second frequency.
Description of Related Art
10 A mixer for frequency translating a signal having a first frequency, such as a radio frequency (RF), to a signal having a second frequency, such as an intermediate frequency (IF), is provided in a wide variety of implementations, such as in radio transceiver front-ends.
15 Bluetooth® is a communication standard where the major goal has been to remove cable connections between electrical equipment. One area, where Bluetooth® is of particular interest, is communication involving portable equipment, such as mobile terminals. The terminals may also be adapted
20 to communicate according to e.g. a telecommunication
technology, such as GSM, UMTS, cdma2000, PCS, DCS etc. A mixer may be necessary for the radio transceiver front-end of the Bluetooth® radio and the telecommunication radio. In portable communication equipment, low power
25 solutions for all electronic components are important.
Thus, the tendency in integrated circuit design is to apply low supply voltage for e.g. the mixer. Also, it is often required that the implementation of the mixer is cheap. MOS (Metal Oxide Semiconductor) technology offers a solution,
30 with which is possible to implement fully integrated mixers. However, it is essential to find circuit architectures capable of high performance at supply voltages at or below 2V.
In modern radio communication architectures, such as
35 direct-conversion and low-IF, quadrature mixers are needed.


WO 2005/060089 PCT/EP2004/013000
will also introduce additional noise. This is particularly-severe for low voltage circuits.
Summary of the Invention
5 It is an object of the present invention to provide a quadrature mixer arrangement comprising two mixers for converting a signal having a first frequency to a signal having a second frequency. More specifically, it is an object of the invention to provide a mixer arrangement
10 comprising two quadrature mixers, which are isolated from each other without substantially effecting the noise performance of the arrangement. Moreover, it is an object of the invention to provide a mixer arrangement that is suitable for implementation using MOS technology.
15 According to a first aspect of the invention, the above objects are achieved by a quadrature mixer arrangement for converting a first signal at a first frequency to a second signal at a second frequency. The arrangement comprises input means for receiving the first
20 signal and output means for outputting the second signal. A first mixing means is connected a first and a second terminal for inputting or outputting the first or second signal. A second mixing means is connected in parallel with the first mixer and connected to the first and second
25 terminals. A set of switch devices is provided in the
signal path between the mixers and the first and second terminals. Thus any short-circuit path occurring when the mixing means are at least partly conducting simultaneously may be eliminated.
3 0 The first mixer may be arranged to be conductive for
a first and/or a second state of a mixing signal and to mix a first input signal with a first mixer signal to provide a first output signal. The second mixer is connected in parallel with the first mixer, and may be arranged to be
3 5 conductive for a first and/or a second state of a second

WO 2005/060089 PCT/EP2004/013000
mixer signal. Furthermore, the second mixer is arranged to provide a second output signal in quadrature to the first output signal. The mixers are connected to common first and second RF terminals of the arrangement. When transistors of 5 the mixers are conducting simultaneously a path is created between a first and a second IF terminal. The set of switch devices interrupts any potential short-circuit path between the IF terminals.
The first and second mixing signals and their
10 respective inverse signals are provided by four local oscillator (LO) signals, which are phase shifted JI/2 radians in relation to each other.
The first and second mixers may comprise a set of mixing means, each having a first, second, and third
15 terminal. The first mixer is adapted to be driven by a
first LO signal and its inverse signal having a first and a third phase, respectively, received at the third terminals of the mixing means of the first mixer. The second mixer is adapted to be driven by a second LO signal and its inverse
2 0 signal having a second and a fourth phase, respectively,
received at the third terminals of the mixing means of the second mixer.
In each mixer, first and second switch devices may be provided in the signal path between the first terminals of
2 5 the first and the third mixing means and the first RF
terminal. Similarly, third and forth switch devices may be provided between the second terminals of the second and fourth mixing means and the second RF terminal. Thus any short circuit between the IF terminals may be avoided.
3 0 The mixers and/or the switch devices may comprise FET
transistors provided in CMOS technology.
The mixer arrangement may be provided either as a transmitter or receiver mixer. In a transmitter mixer, a quadrature IF signal will be provided as input signal and 35 an RF signal as output signal. In a receiver mixer, an RF

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be conductive for the first and/or the second state of the
first mixing signal.
Further embodiments of the invention are defined in
the dependent claims.
5 It is an advantage of the invention that the IF short
circuit paths between the parallel connected mixers of the
invention are eliminated. Furthermore, it is an advantage
that the noise performance compared with the known art is
substantially improved such that the mixer arrangement is 10 well suited for implementation in MOS technology and may be
adapted for low supply voltage and low (or zero) IF
frequency.
It should be emphasized that the term
"comprises/comprising" when used in this specification is 15 taken to specify the presence of stated features, integers,
steps or components but does not preclude the presence or
addition of one or more other features, integers, steps,
components or groups thereof.
20 Brief Description of the Drawings
Further objects, features, and advantages of the invention will appear from the following description of several embodiments of the invention, wherein various aspects of the invention will be described in more detail
2 5 with reference to the accompanying drawings, in which:
Fig. 1 is a block diagram of a prior art mixer arrangement;
Fig. 2 is a front view of a mobile telephone and the environment in which it may operate;
3 0 Fig. 3 is a block diagram of a the mixer arrangement
according to the invention; and
Fig. 4 is a signaling scheme illustrating the local oscillator signals for controlling the mixer arrangement.

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Detailed Description of Embodiments
Fig. 2 illustrates a mobile telephone 1 as one exemplifying electronic equipment, in which the mixer according to the present invention may be provided, and a 5 possible environment in which it may operate. The invention is not limited to a mobile telephone 1. The invention may be provided in a wide variety of electronic equipment wherein a mixer is required for converting a first input signal having a first frequency to a second signal having a
10 second frequency. The mobile telephone 1 may comprise a first antenna 10 and a second auxiliary antenna 11. A microphone 12, a loudspeaker 13, a keypad 14, and a display 15 provide a man-machine interface for operating the mobile telephone 1.
15 The mobile telephone may in operation be connected to a radio station 20 (base station) of a mobile communication network 21, such as a GSM, UMTS, PCS, and/or DCS network, via a first radio link 22 by means of the first antenna 10. Furthermore, the mobile telephone 1 may in operation
20 establish a second wireless link to a peripheral device 3 0 via a second wireless link 31 by means of the auxiliary antenna 11. The second link 31 is e.g. a Bluetooth® link, which is established in the 2.4 (2.400-2.4835) GHz frequency range. To establish the wireless links 22, 31,
25 the mobile telephone 1 comprises radio resources, which are adapted according to the relevant technologies that are used. Thus, the mobile telephone 1 comprises a first radio access means, such as a transceiver, for communicating with the base station 20, and a second radio access means for
30 communicating with the peripheral device 30.
The peripheral device 3 0 may be any device having wireless communicating capabilities, such as according to Bluetooth® technology or any other wireless local area network (WLAN) technology. It comprises an antenna 32 for
35 exchanging signals over the second link 31, and a

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°transceiver (not shown) adapted according to the communication technology that the peripheral device 30 uses. The device may be a wireless headset, a remote server, a fax machine, a vending machine, a printer etc. A 5 wide variety of electronic equipment may have such
communication capabilities and have a need for wirelessly transferring of data.
When receiving signals having radio frequencies (RF), the RF signals may have to be down converted to a signal
10 having a lower frequency, such as an intermediate frequency (IF) before further signal processing is applied. Similarly, an IF signal may have to be up converted to a signal having a higher frequency, such as a RF frequency, before transmitted. Thus, the radio access means of the
15 mobile telephone 1 may comprise one or several mixers
according to the invention for converting a signal having a first frequency to a signal having a second frequency.
Fig. 3 illustrates a mixer arrangement according to the invention. The mixer arrangement is arranged to
20 generate intermediate frequency signals IFr and IFQ having I and Q phases, respectively, based on an RF signal provided at RF" and RF+ terminals, or vice versa. The arrangement is a balanced passive quadrature mixer arrangement comprising a first and a second mixer 200, 300
25 connected in parallel and arranged to be driven in
quadrature. Each of the mixers 2 00, 300 comprises a set of mixing devices 210, 220, 230, 240, and 310, 320, 330, 340. Here the number of mixing devices of each mixer 2 00, 300 is four. However, the number is only exemplary and should not
30 be taken as limiting the scope of the claims. The mixing
means 210-240, 310-340 may comprise a FET transistor, such as a MOSFET, which may be provided using CMOS technology. Each of the mixing means 210-240, 310-340 provides a voltage switch for enabling mixing of the RF signal and
35 first and second LO signals, or mixing of the IF signal and

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10
the LO signals. The MOS transistor has true voltage switch characteristics. Therefore, it is possible to provide switching in the voltage domain. This makes it possible to reduce or even eliminate the DC current flow through the 5 transistor, and thereby avoid the 1/f noise, which would be a problem especially for direct conversion and low IF-receiver characteristics.
Each mixing means 210-240, 310-340 may be provided as an NMOS transistor or a PMOS transistor. The NMOS
10 transistor has better switch performance than the PMOS transistor due to the better mobility of electrons than holes. Other voltage controlled switches, such as the junction field effect transistor (JFET) may still alternatively be utilized as the mixing means.
15 The topology of the first and second mixers 200, 300 is basically the same. Thus, a first terminal of the first mixing means 210, 310 is operatively connected to a positive RF terminal, which may be connected to any of the antennas 10, 11. A second terminal of the first mixing
20 means 210, 310 is connected to a first terminal of the second mixing means 220, 320. A second terminal of the second mixing means 220, 320 is operatively connected to a negative RF terminal. A first terminal of the third mixing means 230, 330 is operatively connected to the positive RF
25 terminal. A second terminal of the third mixing means 230, 330 is connected to a first terminal of the fourth mixing means 240, 340. A second terminal of the fourth mixing means 240, 340 is operatively connected to the negative RF terminal. Also, a connection is provided between the second
30 terminals of the first and third mixing means 210, 230, 310, 330, and thus between the first terminals of the second and fourth mixing means 220, 240, 320, 340. At said connection, IF terminals are provided for providing, or receiving, first and second IF signals IFj and IFQ, as will
3 5 be explained below.

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Each of the mixing means 210-240, 310-340 comprises a third terminal for receiving a signal from a local oscillator (not shown). During operation of the mixing arrangement, the RF signal will be mixed with mixing 5 signals, i.e. the LO signal to provide a down converted IF signal. In use in a transmitter arrangement, the IF signal will be mixed with the LO signal to provide an up converted RF signal. The mixer arrangement is driven in quadrature. Thus, the first and fourth mixing means 210, 240 of the
10 first mixer 200 will in operation receive a first LO signal LOi+ having a first phase 6 and frequency at their third terminals. The second and third mixing means 220, 230 of the first mixer 200 will in operation receive the inverse of the first LO signal Loi+, i.e. a LO signal phase shifted
15 by J1 radians. The second and third mixing means 320, 330 of the second mixer 300 will in operation receive a second LO signal LOQ+ having a second phase G+JI/2 and a frequency corresponding to the first LO signal at their third terminals. The first and fourth mixing means 310, 340 of
20 the second mixer 300 will in operation receive the inverse of the second LO signal LOQ", i.e. a LO signal phase shifted JI radians in relation to the second LO signal.
To avoid short circuit paths between the IF terminals, signal path switches are provided between the
25 mixers and the RF terminals. Thus, the first mixer 200 comprises a first set of signal path switches 250, 260, 270, 280, and the second mixer 3 00 comprises a second set of signal path switches 350, 360, 370, 380. In this embodiment, the signal path switches are provided by mixing
30 means corresponding to the mixing means 210-240, 310-340 of the mixers 200, 300. The first and fourth signal path switches 250, 280 of the first mixer 2 00 correspond to the second and third mixing means 320, 330 of the second mixer 300. The second and third signal path switches 260, 270 of
35 the first mixer 200 correspond to the first and fourth

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mixing means 310, 340 of the second mixer 3 00. The first and fourth signal path switches 350, 380 of the second mixer 300 correspond to the first and fourth mixing means 210, 240 of the first mixer 200. The second and third 5 signal path switches 360, 370 of the second mixer 300
correspond to the second and third mixing means 220, 230 of the second mixer 300.
A first terminal of the first and third signal path switches 250, 270, 350, 370 is connected to the positive RF
10 terminal, and a second terminal of said switches are
connected to the first terminal of the first and third mixing means 210, 230, 310, 330, respectively. Correspondingly, a first terminal of the second and fourth signal path switches 260, 280, 360, 380 is connected to the
15 second terminal of the second and forth mixing means 220, 240, 320, 320, and a second terminal of said switches is connected to the negative RF terminal, respectively.
Third terminal of the switches 250-280, 350-380 are connected to receive LO signals correspondingly to their
20 corresponding mixing means 210-240, 310-340 of the mixers 200, 300. Thus, in this embodiment the switches will be a part of the frequency translation from a first to a second frequency.
The mixer arrangement is arranged to achieve
25 quadrature mixing. Thus, two switches driven by the second LO signal LOQ are for some time intervals conducting simultaneously as two mixing means driven by the first LO signal LOr are conducting.
Fig. 4 illustrates the local oscillator (LO) signals
30 LOi+, LO3;", L0Q+, and L0Q". LOi and L0Q can each have a first and a second state, i.e. a specific frequency and phase, for turning a mixing means connected to the signal on or off. The first mixer 200 is conductive for a first and/or a second state of the first LO signal LO^ The second mixer
35 300 is conductive for a first and/or a second state of the

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second mixing signal. As can be seen from the scheme of Fig. 4, two LO signals can be positive simultaneously, which corresponds to the gray areas. If the phases of the LO signals are chosen as described above, LOi+ and LOQ", LOi+ 5 and LOQ+, LOQ+ and LOi", and LO;r" and LOQ", respectively, will be positive simultaneously, as is illustrated in Fig. 4. To avoid short circuits, the switches are therefore arranged such that in each potential path between the IF terminals IF;: and IFQ there are at least two switches controlled by
10 signals having opposite phases, such as LOi+ and LCV,
wherein there will be no risk of interference between the IF terminals. The switches 250-280 connected to the first mixer 200 are arranged to be conductive for the first and/or second state of the LO or mixing signal driving the
15 second mixer 300. The switches 350-380 connected to the second mixer 300 are arranged to be conductive for the first and/or second state of the LO or mixing signal driving the first mixer 200. Thus, any short circuit between the mixers 200, 300 is avoided without
2 0 substantially introducing any noise.
The embodiment of Fig. 3 illustrates one possible combination of providing the mixing means and the switches. There are a number of combinations, which will achieve the same result. Each of the switches may e.g. be interchanged
2 5 with the mixing means to which it is connected. The
combination that achieves the best performance has to be tested in each specific case and should not be limited by the embodiment shown.
The mixer arrangement may be arranged to down convert
3 0 an RF signal received as an input signal at the RF
terminals to an IF output signal provided at the IF terminals. Alternatively, an IF signal provided as an input signal at the IF terminals may be up converted to an RF output signal provided at the RF terminals. Thus, the 3 5 present invention may be incorporated in either a receiver

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PCT/EP2004/013000

or a transmitter for providing frequency conversion from a first to a second frequency.
The present invention has been described above with reference to specific embodiments. However, other 5 embodiments than the above described are equally possible within the scope of the invention. Different method steps than those described above, performing the method by hardware or software, may be provided within the scope of the invention. The different features and steps of the 10 invention may be combined in other combinations than those described. The invention is only limited by the appended patent claims.

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CLAIMS
1. A quadrature mixer arrangement for converting a
first signal at a first frequency to a second signal at a
5 second frequency, comprising:
a first mixer (2 00) operatively connected to a first and a second terminal; and
a second mixer (300) connected in parallel with the first mixer and operatively connected to the first, and 10 second terminals;
characterized by
a set of switch devices (250, 260, 270, 280, 350, 360, 370, 380) provided in the signal path(s) between the mixers and the first and second terminals. 15
2. The arrangement according to claim 1, wherein
the first mixer (200) is arranged to be conductive
for a first and/or a second state of a first mixing signal, and arranged to mix the first signal with the first mixing
20 signal to provide the second signal;
the second mixer (300) is arranged to be conductive for a first and/or a second state of a second mixing signal, and arranged to mix the first signal with the second mixing signal to provide the second signal; and
25 switch devices (250, 260, 270, 280) connected to the first mixer arranged to be conductive for the first and/or second state of the second mixing signal, and switch devices (350, 360, 370, 380) connected to the second mixer arranged to be conductive for the first and/or the second
3 0 state of the first mixing signal.
3. The arrangement according to claim 1 or 2, wherein
the first and second mixing signals are first and second
local oscillator (LO) signals (LOx, L0Q) , and/or their
35 inverse signals, having a common frequency and phases,

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which are phase shifted Jl/2 radians in relation to each other.
4. The arrangement according any of the previous
5 claims, wherein the first and second mixer (2 00, 300)
comprises a set of mixing means (210, 220, 230, 240, 310, 320, 330, 340), each of said mixing means having a first, second, and third terminal, the first mixer (200) is adapted to be driven by the first mixing signal being an LO
10 signal and/or its inverse signal having first and third
phases received at the third terminals of the mixing means (210-240) of the first mixer (200) , and the second mixer is adapted to be driven by the second mixing signal being a second LO signal and/or its inverse signal having second
15 and fourth phases received at the third terminals of the mixing means (310-340) of the second mixer (300) .
5. The arrangement according to claim 4, wherein in
each of the mixers (200, 300) first terminals of a first
20 and a third mixing means (210, 230, 310, 330) of said set of mixing means are operatively connected to the first terminal of the arrangement and second terminals of said first and third mixing means are connected to first terminals of a second and a fourth mixing means (220, 240,
25 32 0, 340) of said set of mixing means, second terminals of said second and fourth mixing means are operatively connected to the second terminal of the arrangement, and wherein IF terminals are provided at the second terminals of said first and third mixing means.
30
6. The arrangement according to claim 5, wherein the
mixing means (210-240, 310-340) are provided by
transistors, and wherein the first and fourth mixing means
(210, 240) of the first mixer (200) are adapted to be
35 driven by the first mixing signal, the second and third

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mixing means (220, 23 0) of said first mixer are adapted to be driven by the inverse signal of the first mixing signal, and wherein the first and fourth mixing means (310, 340) of the second mixer (300) are adapted to be driven by the 5 second mixing signal, the second and third mixing means
(320, 330) of said second mixer are adapted to be driven by the inverse signal of the second mixing signal.
7. The arrangement according to any of the previous
10 claims, wherein the set of switch devices (250-280, 350-
380) is provided by transistors.
8. The arrangement according to claim 6 or 7, wherein
in each mixer (200, 300) first and third switch devices
15 (250, 270, 350, 370) are provided in the signal path
between the first terminal of the first and third mixing means (210, 230, 310, 330) and the first terminal of the arrangement, and second and forth switch devices (260, 280, 360, 380) are provided between the second terminals of the
20 second and fourth mixing means (220, 240, 320, 340) and the second terminal of the arrangement.
9. The arrangement according to claim 8, wherein the
first and fourth switch devices (250, 2 80) connected to the
25 first mixer (200) are adapted to be driven by the second mixing signal, the second and third switch devices (260, 270) connected to said first mixer are adapted to be driven by the inverse signal of the second mixing signal, the first and fourth switch devices (350, 380) connected to the
30 second mixer (3 00) are adapted to be driven by the first mixing signal, and the second and third switch devices (360, 370) connected to said second mixer are adapted to be driven by the inverse signal of the first mixing signal.

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10. The arrangement according to any of the previous
claims, wherein the mixers (200, 300) and/or the set of
switch devices (250-280, 350-380) comprise a voltage
controlled switch.
5
11. The arrangement according to any of the previous
claims, wherein the mixers (200, 300) and/or the set of
switch devices (250-280, 350-380) comprise FET transistors.
10 12. The arrangement according to claim 11, wherein the FET transistors are provided in CMOS technology.
13. The arrangement according to any of the previous
claims, wherein the arrangement is provided as a
15 transmitter mixer, the first signal is a quadrature IF
signal to be received as an input signal, and the second signal is an RF signal to be provided as an output signal.
14. The arrangement according to any of the claims 1
20 to 12, wherein the arrangement is provided as a receiver
mixer, the first signal is an RF signal to be received as an input signal, and the second signal is a quadrature IF signal to be provided as an output signal.
25 15. A wireless communication device (1) having a
communication interface for wirelessly communicating with a remote communication device, characterized by a mixing arrangement according to any of the claims 1-14.
3 0 16. The device according to claim 15, wherein the device is a portable radio communication equipment, a. mobile radio terminal, a pager, a communicator, an electronic organizer, or a smartphone.

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18
17. The device according to claim 15, wherein the
device is a mobile telephone (1).
18. A method of mixing signals for converting a first
5 signal at a first frequency to a second signal at a second
frequency, comprising the steps of:
receiving the first signal;
mixing the first signal in a mixer arrangement comprising a first and a second mixer (20 0, 3 00) connected 10 in parallel to provide the second signal, each mixer is connected to a first and a second terminal;
characterized by the step of:
controlling a set of switch devices (250, 260, 270, 280, 350, 360, 370, 380) provided in a signal path between 15 the mixers and a first terminal to operatively connect either the first or the second mixer to the first and second terminals.
19. The method according to claim 18, further
2 0 comprising the steps of
controlling the first mixer (110; 2 00) to be conductive for a first and/or a second state of a first mixing signal for mixing the first signal with the first mixing signal to provide the second signal; 25 controlling the second mixer (120; 300) to be
conductive for a first and/or a second state of a second mixing signal for mixing the first signal with the second mixing signal to provide the second signal;
controlling switch devices (250, 260, 270, 280)
3 0 connected to the first mixer to be conductive for the first
and/or the second state of the second mixing signal, and controlling switch devices (350, 360, 370, 380) connected to the second mixer to be conductive for the first and/or the second state of the first mixing signal.

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19
20. The method according to claim 18 or 19, wherein
the first and second mixing signals are first and second
local oscillator (LO) signals, and/or their inverse
signals, having a common frequency and first and second
5 phases, which are phase shifted H/2 radians in relation to each other.
21. The method according to any of the claims 18 to
20, comprising the steps of providing a set of mixing means
10 (210, 220, 230, 240, 310, 320, 330, 340) in each of the first and second mixer (200, 300), wherein each of said mixing means has a first, second, and third terminal, driving the first mixer (200) by using the first mixing signal being a first LO signal and/or its inverse signal
15 having first and third phases received at trie third
terminals of the mixing means (210-240) of the first mixer (200) , and driving the second mixer by using the second mixing signal being( a LO signal and/or its inverse signal having second and fourth phases received at the third
20 terminals of the mixing means (310-340) of the second mixer (300) .
22. The method according to claim 21, further
comprising the steps of for each of the mixers (200, 300)
25 operatively connecting a first terminal of a first and a third mixing means (210, 230, 310, 330) of said set of mixing means to the first terminal of the arrangement and a second terminal of said first and third mixing means to first terminals of a second and a fourth mixing means (220,
30 240, 340, 340) of said set of mixing means, operatively connecting a second terminal of said second and fourth mixing means to the second terminal of the arrangement, providing the third and fourth terminals being IF terminals at the second terminals of said first and third mixing
3 5 means.

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23. The method according to claim 22, further comprising the steps of providing the mixing means (210-240, 310-340) as transistors, driving the first and fourth 5 mixing means (210, 240) of the first mixer (200) by using the first mixing signal, driving the second and third mixing means (220, 230) of said first mixer by using the inverse signal of the first mixing signal, driving the first and fourth mixing means (310, 340) of the second 10 mixer (300) by using the second mixing signal, and driving the second and third mixing means (320, 330) of said second mixer by using the inverse signal of the second mixing signal.
15 24. The method according to any of the claims 18-23, comprising the step of providing the switch devices (250-280, 350-3 80) by means of a transistor.
25. The method according to claim 23 or 24,
20 comprising the steps of for each mixer (200, 300) providing the first and third switch devices (250, 270, 350, 370) in the signal path between the first terminal of the first and third mixing means (210, 230, 310, 330) and the first terminal, and second and forth switch devices (260, 280,
25 360, 380) between the second terminals of the second and fourth mixing means (220, 240, 320, 340) and the second terminal.
26. The method according to claim 25, comprising the
30 steps of driving the first and fourth switch devices (250,
280) connected to the first mixer (200) by using the second mixing signal signal, driving the second and third switch devices (2 60, 27 0) connected to said first mixer by using the inverse signal of the second mixing signal signal, 35 driving the first and fourth switch devices (350, 380)

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connected to the second mixer (300) by using the first mixing signal signal, and driving the second and third switch devices (360, 370) connected to said second mixer by using the inverse signal of the first mixing signal.
10
15
27. The method according to any of the claims 18 to 26, comprising the step of providing the mixers (100; 200, 300) and/or the switch devices (140; 250-280, 350-380) as a voltage controlled switch.
28. The method according to any of the claims 18-27, comprising the step of providing the mixers (100; 200, 300) and/or the switch devices (140; 250-280, 350-380) by FET transistors.
29. The method according to claim 28, comprising the step of providing the FET transistors by using CMOS technology.
20 30. The arrangement according to any of the claims 18 to 29, comprising the step of providing the arrangement as a transmitter mixer, the first signal being a quadrature IF signal, and the second signal being an RF signal.
25 31. The arrangement according to any of the claims 18 to 29, comprising the step of providing the arrangement as a receiver mixer, the first signal being an RF signal, and the first signal being a quadrature IF signal.
32. A quadrature mixer arrangement, a wireless communication device and a
method of mixing signals for converting a first signal at a first frequency to a second
signal at a second frequency, substantially as herein described and illustrated with
reference to the-accompanying drawings.
Dated, this 4th day of May, 2006.
(G. DEEPAK SRINIWAS)
OF K & S PARTNERS
AGENT FOR THE APPLICANT

23
Abstract
A quadrature connected passive mixer arrangement for frequency converting analog signals from a first to a second frequency. The arrangement comprises two parallel connected mixers provided as transistors. First and second LO signals and their inverse signals having separated phases are provided for driving the transistors. Signal path switches are provided between the RF terminals and the mixer transistors. The switches are driven by signals having a different phase than the signal driving the corresponding mixer transistor. Thus, any short circuit between IF terminals- of the arrangement may be eliminated.

Documents:

523-MUMNP-2006-ABSTRACT(21-7-2011).pdf

523-MUMNP-2006-ABSTRACT(8-5-2006).pdf

523-MUMNP-2006-ABSTRACT(GRANTED)-(4-10-2011).pdf

523-mumnp-2006-abstract.doc

523-mumnp-2006-abstract.pdf

523-mumnp-2006-abstract1.jpg

523-MUMNP-2006-CANCELLED PAGES(21-7-2011).pdf

523-mumnp-2006-claims(8-5-2006).pdf

523-MUMNP-2006-CLAIMS(AMENDED)-(21-7-2011).pdf

523-MUMNP-2006-CLAIMS(GRANTED)-(4-10-2011).pdf

523-MUMNP-2006-CLAIMS(MARKED COPY)-(21-7-2011).pdf

523-mumnp-2006-claims.pdf

523-mumnp-2006-correspondance-received.pdf

523-mumnp-2006-correspondence(4-12-2007).pdf

523-MUMNP-2006-CORRESPONDENCE(IPO)-(4-10-2011).pdf

523-mumnp-2006-description (complete).pdf

523-mumnp-2006-description(complete)-(8-5-2006).pdf

523-MUMNP-2006-DESCRIPTION(GRANTED)-(4-10-2011).pdf

523-MUMNP-2006-DRAWING(21-7-2011).pdf

523-mumnp-2006-drawing(8-5-2006).pdf

523-MUMNP-2006-DRAWING(GRANTED)-(4-10-2011).pdf

523-MUMNP-2006-EP DOCUMENT(21-7-2011).pdf

523-MUMNP-2006-FORM 1(21-7-2011).pdf

523-MUMNP-2006-FORM 1(8-5-2006).pdf

523-mumnp-2006-form 18(4-12-2007).pdf

523-mumnp-2006-form 2(8-5-2006).pdf

523-MUMNP-2006-FORM 2(GRANTED)-(4-10-2011).pdf

523-MUMNP-2006-FORM 2(TITLE PAGE)-(21-7-2011).pdf

523-mumnp-2006-form 2(title page)-(8-5-2006).pdf

523-MUMNP-2006-FORM 2(TITLE PAGE)-(GRANTED)-(4-10-2011).pdf

523-MUMNP-2006-FORM 26(21-7-2011).pdf

523-MUMNP-2006-FORM 3(21-7-2011).pdf

523-mumnp-2006-form 3(8-11-2006).pdf

523-MUMNP-2006-FORM 3(8-5-2006).pdf

523-mumnp-2006-form-1.pdf

523-mumnp-2006-form-2.doc

523-mumnp-2006-form-2.pdf

523-mumnp-2006-form-26.pdf

523-mumnp-2006-form-3.pdf

523-mumnp-2006-form-5.pdf

523-MUMNP-2006-REPLY TO EXAMINATION REPORT(21-7-2011).pdf

523-mumnp-2006-wo international publication report(8-5-2006).pdf

abstract1.jpg


Patent Number 249139
Indian Patent Application Number 523/MUMNP/2006
PG Journal Number 40/2011
Publication Date 07-Oct-2011
Grant Date 04-Oct-2011
Date of Filing 08-May-2006
Name of Patentee TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Applicant Address S-164 83 STOCKHOLM
Inventors:
# Inventor's Name Inventor's Address
1 SJOLAND, HENRIK GOKBLOMSTERVAGEN 25, SE-246 51 LODDEKOPINGE, SWEDEN
2 TILLMAN, Fredrik Julgranden 5 B, SE-226 49,Lund, Sweden
PCT International Classification Number H03D7/14
PCT International Application Number PCT/EP2004/013000
PCT International Filing date 2004-11-17
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 03028350.1 2003-12-10 EUROPEAN UNION
2 60/529,984 2003-12-16 EUROPEAN UNION