Patent ID: 6826372
Filing Date: 2004-11-30
Classification: H04B,H04L

Abstract:
An optical communications receiver circuit, comprising:a limiter amplifier having differential inputs and differential outputs, one differential input receiving a binary electrical waveform generated by an optical-to-electrical converter receiving an optical communications signal; two low-pass filter circuits each having an input and an output, the input of each low-pass filter circuit being coupled to a corresponding differential output of the limiter amplifier; a differential amplifier having an output and differential inputs, each input being coupled to the output of a corresponding one of the low-pass filter circuits; an integrator circuit having an output and a pair of differential inputs, the output being coupled to the other differential input of the limiter amplifier, one differential input being coupled to the output of the differential amplifier, and the other differential input having a set point signal supplied thereto; and set point adjustment circuitry operative to generate the set point signal, the set point signal indicating a desired difference between the respective average DC values of the differential outputs of the limiter amplifier.