Mixer circuit and method

Details Mixer circuit and method Mixer circuit and method

2006-07-14

2009-10-20

Vo, Nguyen (Department: 2618)

Telecommunications

Transmitter

Noise or interference elimination

C455S115200, C455S118000

Reexamination Certificate

active

07606538

ABSTRACT:
A mixer circuit includes a mixer having input terminals and an output terminal, to provide an output signal by mixing input signals, wherein the mixer exhibits leakage. The circuit also includes a signal generator coupled to one of the input terminals of the mixer to provide a correction signal, an up-conversion mixer coupled to the mixer to provide an up-converted signal by mixing a test signal with the output signal of the mixer, and a down-conversion mixer coupled to the up-conversion mixer to provide a down-converted signal by down-converting the up-converted signal. A signal detector is coupled to the down-conversion mixer and detects a spurious signal in the down-converted signal, the spurious signal indicating the leakage, and a control unit is coupled to the signal detector and the signal generator to control generation of the correction signal depending on the detected spurious signal to compensate the leakage.

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