Patent ID: 7777546
Filing Date: 2010-08-17
Classification: H03F,H03K

Abstract:
1. A DC offset calibration apparatus comprising: a first adjustment unit, for receiving a first input signal and a first offset calibration signal and for adjusting the first input signal to generate a first output signal according to the first offset calibration signal; a first offset calibration circuit, coupled to the first output signal and the first adjustment unit, for determining the first offset calibration signal according to the first output signal and at least one predetermined threshold value, the first offset calibration circuit comprising: a second adjustment unit, for receiving a second input signal and a second offset calibration signal and for adjusting the second input signal to generate a second output signal according to the second offset calibration signal; and a second offset calibration circuit, coupled to the second output signal and the second adjustment unit, for determining the second offset calibration signal according to the second output signal and the predetermined threshold value, the second offset calibration circuit comprising: wherein the first input signal and the second input signal are a differential signal pair.