Radio frequency mixer and method of operation

Details Radio frequency mixer and method of operation Radio frequency mixer and method of operation

2005-01-04

2005-01-04

Nguyen, Simon (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S293000, C455S316000, C455S326000, C455S337000, C375S324000

Reexamination Certificate

active

06839551

ABSTRACT:
There is disclosed a radio frequency (RF) demodulation circuit comprising: 1) a first RF mixer having a first input port for receiving an in-phase RF signal having a frequency of RF and a second input port for receiving an in-phase local oscillator (LO) signal having a frequency of LO, wherein LO is approximately equal to one-half of RF, and wherein the first RF mixer generates a first intermediate frequency (IF) signal having a frequency of LO; 2) a second RF mixer having a first input port for receiving an out-of-phase RF signal having a frequency of RF and a second input port for receiving an out-of-phase local oscillator (LO) signal having a frequency of LO, and wherein the second RF mixer generates a second intermediate frequency (IF) signal having a frequency of LO; and 3) a first signal combiner for combining the first and second IF signals to generate a composite IF signal, wherein the first signal combiner combines a first leakage signal from the first RF mixer and a second leakage signal from the second RF mixer such that the first and second leakage signals at least partially cancel each other to produce an output leakage signal that is less than either of the first and second leakage signals.

REFERENCES:
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patent: 5862466 (1999-01-01), Erickson
patent: 6449471 (2002-09-01), Katsura et al.
patent: 6473606 (2002-10-01), Ecklund et al.
patent: 6683919 (2004-01-01), Olgaard et al.
patent: 6693980 (2004-02-01), Linder et al.

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