Patent ID: 6211716
Filing Date: 2001-04-03
Classification: H03F,H04L

Abstract:
An apparatus for compensating for offset and Baseline Wander Effect in an input signal, comprising:a forward path stage configured to receive a forward path input signal and to generate a first forward path output signal (P) and a second forward path output signal (M);coupled to the forward path stage, a first peak detector configured to receive the first forward path output signal (P) from the forward path stage and capable of detecting a peak of the first forward path output signal (P), the first peak detector further capable of generating a peak signal (Ptop) which is a value of the peak of the first forward path output signal (P);coupled to the forward path stage, a second peak detector configured to receive the second forward path output signal (M) from the forward path stage and capable of detecting a peak of the second forward path output signal (M), the second peak detector further capable of generating a peak signal (Mtop) which is a value of the peak of the second forward path signal (M);a first window generator coupled to the first peak detector and configured to generate a top peak timing window in response to a pulse occurrence in the first forward path output signal (P);a second window generator coupled to the second peak detector and configured to generate a bottom peak timing window in response to a pulse occurrence in the second forward path output signal (M);wherein the top peak timing window enables the first peak detector to process the first forward path output signal (P) to generate the peak signal (Ptop);wherein the bottom peak timing window enables the second peak detector to process the second forward path output signal (M) to generate the peak signal (Mtop);a differential amplifier coupled to the first peak detector and the second peak detector and capable of generating an offset control signal based upon a difference between the peak signal (Ptop) and the peak signal (Mtop); anda compensation stage coupled to the differential amplifier and capable of compensating for offset in the input signal in response to the offset control signal, the compensation stage further configured to generate the forward path input signal for input into the forward path stage.