Patent ID: 7489740
Filing Date: 2009-02-10
Classification: H03G,H04L

Abstract:
1. A receiver with baseline wander compensation applicable to a network system, the receiver comprising: an Analog-to-Digital Converter (ADC) for receiving a compensated communication signal from the network system and performing an analog-to-digital conversion on the communication signal so as to produce a digitalized signal; a slicer for receiving and mapping the digitalized signal; a baseline wander compensator for receiving a pre-mapping voltage and a post-mapping voltage of the slicer, and computing and filtering the two voltages to obtain a baseline wander voltage value; a threshold value detector for receiving the baseline wander voltage value output from the baseline wander compensator, detecting whether the voltage value exceeds a predetermined threshold value, and outputting binary word control signals if the voltage exceeds the predetermined threshold value; a gain controller for receiving the binary word control signals from the threshold value detector, so as to provide analog and digital gain control signals based on the binary word control signals; an analog gain stage for receiving the analog gain control signal output from the gain controller and a communication signal from the network system, so as to compensate the communication signal according to the analog gain control signal and input the compensated communication signal to the ADC; a delay circuit for delaying the digital gain control signal output from the gain controller; a digital gain stage for receiving the delayed digital gain control signal, so as to adjust and compensate amplitude of the digitalized signal output from the ADC; and an adder for computing the baseline wander voltage value output from the baseline wander compensator and the digitalized signal completed with the amplitude adjustment and compensation from the digital gain stage, so as to achieve baseline wander correction.