DC offset calibration for a radio transceiver mixer

Details DC offset calibration for a radio transceiver mixer DC offset calibration for a radio transceiver mixer

2006-05-02

2006-05-02

Nguyen, Simon (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S285000, C455S302000, C455S326000

Reexamination Certificate

active

07039382

ABSTRACT:
A mixer for a radio transceiver includes a commutating mixer switch having a first differential input port coupled to a DC offset cancellation path. The first differential input port of the mixer switch includes a first terminal coupled to a first end of a first resistor and a second terminal coupled to a first end of a second resistor. Second ends of the first and second resistors are configured to receive a differential input signal. The DC offset cancellation path may provide a resistively coupled DC calibration signal for reducing the magnitude of DC offsets that may be present at the input of the mixer switch. The concept can be used for either image or non-image reject mixers.

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