| Title of Invention | A METHOD FOR PERFORMING CALIBRATION FOR SECOND ORDER INTERMODULATION (IM2) DISTORTION AND AN INTEGRATED CIRCUIT THEREOF |
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| Abstract | A downconversion mixer with IM2 cancellation includes a mixer, an IM2 generator, and a scaling unit. The mixer frequency downconverts an input RF signal with an LO signal and generates an output baseband signal. The IM2 generator includes first and second field effect transistors (FETs) that receive the input RF signal and generate an intermediate signal having IM2 distortion. The scaling unit scales the intermediate signal to generate a scaled signal and further combines the scaled signal with the output baseband signal to cancel IM2 distortion in the output baseband signal. The IM2 generator may further include first and second amplifiers coupled between the source and gate of the first and second FETs, respectively. Different amounts of IM2 distortion and different temperature variation patterns may be generated in the intermediate signal by using different gains for the amplifiers. |
| Full Text | IN a digital communication system, a transmitter process traffic data to generate data chip and further modulates a local oscillator (LO) signal with the data chips to generate a radio frequency (RF) modulated signal.................................... |
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| Patent Number | 258957 | |||||||||
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| Indian Patent Application Number | 539/MUMNP/2008 | |||||||||
| PG Journal Number | 08/2014 | |||||||||
| Publication Date | 21-Feb-2014 | |||||||||
| Grant Date | 18-Feb-2014 | |||||||||
| Date of Filing | 24-Mar-2008 | |||||||||
| Name of Patentee | QUALCOMM INCORPORATED | |||||||||
| Applicant Address | 5775 MOREHOUSE DRIVE, SAN DIEGO, CA 92121. | |||||||||
Inventors:
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| PCT International Classification Number | H03D7/14 | |||||||||
| PCT International Application Number | PCT/US2006/033936 | |||||||||
| PCT International Filing date | 2006-08-30 | |||||||||
PCT Conventions:
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