Patent ID: 7228109
Filing Date: 2007-06-05
Classification: H04B,H04L

Abstract:
1. A radio-frequency (RF) receiver circuitry, comprising: down-converter circuitry configured to accept a received radio-frequency signal, the down-converter circuitry further configured to process the received radio-frequency signal to provide an in-phase down-converted signal and a quadrature down-converted signal; analog-to-digital converter (ADC) circuitry configured to receive the in-phase and quadrature down-converted signals and to provide an in-phase digital output signal and a quadrature digital output signal; DC offset reduction circuitry coupled to the analog-to-digital converter circuitry, wherein the DC offset reduction circuitry tends to reduce a DC offset transmitted to the in-phase and quadrature digital output signals; and a combiner circuitry configured to provide to the analog-to-digital circuitry an in-phase difference signal and a quadrature difference signal, wherein the combiner circuitry subtracts an in-phase output signal of the DC offset reduction circuitry from the in-phase down-converted signal to produce the in-phase difference signal, and wherein the combiner circuitry subtracts a quadrature output signal of the DC offset reduction circuitry from the quadrature down-converted signal to produce the quadrature difference signal.