Patent ID: 7606538
Filing Date: 2009-10-20
Classification: H04B

Abstract:
1. A mixer circuit, comprising: a frequency mixer, having input terminals and an output terminal, configured to provide an output signal by mixing input signals provided at the input terminals, wherein the frequency mixer exhibits a leakage from one of the input terminals into the output terminal; a signal generator coupled to one of the input terminals of the frequency mixer, and configured to generate and provide a correction signal thereto; an up-conversion mixer coupled to the frequency mixer, and configured to generate an up-converted signal by mixing a test signal with the output signal of the frequency mixer; a down-conversion mixer coupled to the up-conversion mixer, and configured to generate a down-converted signal by down-converting the up-converted signal; a signal detector coupled to the down-conversion mixer, and configured to detect a spurious signal in the down-converted signal, the spurious signal indicating the leakage; and a control unit coupled to the signal detector and the signal generator, and configured to control generation of the correction signal depending on the detected spurious signal to compensate for the leakage.