Mixer with carrier leakage calibration
AssigneeMediaTek Singapore Pte. Ltd.
InventorsChoon Yong NG, Ee Sze Khoo
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Abstract
A mixer circuit. The mixer circuit comprises a double-balanced mixer and a carrier-leakage calibration cell. The double-balanced mixer has first and second input pairs whereby the first input pair receives the first differential input signal. The carrier-leakage calibration cell receives the second differential input signal and a differential calibration current and generates first and second output voltages to the second input pair of the double-balanced mixer.
Claims10
A mixer circuit receiving first and second differential input signals and generating a differential output signal, comprising:
- a double-balanced mixer having first and second input pairs and an output pair, wherein the first input pair receives the first differential input signal and the output pair provides the differential output signal;
- and
- a carrier-leakage calibration cell receiving the second differential input signal and a differential calibration current and generating first and second output voltages to the second input pair of the double-balanced mixer.
A quadrature mixer circuit, comprising:
- first and second mixer circuits each receiving first and second differential input signals and generating a differential output signal, each comprising:
- a double-balanced mixer having first and second input pairs and an output pair, wherein the first input pair receives the first differential input signal and the output pair provides the differential output signal;
- and
- a carrier-leakage calibration cell receiving the second differential input signal and a differential calibration current and generating first and second output voltages to the second input pair of the double-balanced mixer;
- wherein the first differential signals of the first and second mixer circuits are of a 90° phase difference.
Dependencies are inferred from the claim text.