Method and apparatus for DC offset cancellation

Details Method and apparatus for DC offset cancellation Method and apparatus for DC offset cancellation

2006-07-11

2006-07-11

Vo, Nguyen T. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S340000, C455S341000

Reexamination Certificate

active

07076232

ABSTRACT:
A radio transceiver includes amplification circuitry that is coupled to receive a down converted signal and to provide infinite rejection of any DC component added by the down conversion circuitry. Specifically, an amplification stage includes a voltage integrator that is coupled within a feedback loop of the amplification circuitry to produce a DC charge having a magnitude that equals the added DC component but a polarity that is opposite. Accordingly, the voltage produced by the voltage integrator is added to the signal received from the down conversion circuitry to cause the amplification circuitry to merely amplify the wireless communication signals characterized by a frequency of oscillation. Logic circuitry is used for selectively coupling the voltage integrator to an output port of the amplification circuitry.

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