Latch-up recovery in quantized feedback dc restorer circuits

Details Latch-up recovery in quantized feedback dc restorer circuits Latch-up recovery in quantized feedback dc restorer circuits

H - Electricity

04

L

H04L 25/06 (2006.01)

Patent

CA 2234037

A method and apparatus for avoiding and or recovering from the latch-up condition in a quantized feedback DC restorer circuit for use in a digital data communication system receiver. An automatic gain control (AGC) circuit controls the level of the received data by comparing the AGC output with a quantized output signal from the DC restorer. A carrier detect circuit detects the presence of data transitions in the quantized output signal, and in the absence of such transitions continuously ramps up the gain of the AGC until such transitions are detected. The carrier detect circuit can be further used to disable, either entirely or partially, the positive feedback path of the DC restorer in the absence of transition in the quantized output signal. The present invention further provides an inherent muting function of the DC restorer output signal in the absence of valid data transitions.

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