Asynchronous data receiver

Details Asynchronous data receiver Asynchronous data receiver

H - Electricity

04

B

354/106, 340/207

H04B 1/22 (2006.01) H04B 10/158 (2006.01) H04L 25/493 (2006.01)

Patent

CA 1141452

BRACKETT-3 - 15 - ASYNCHRONOUS DATA RECEIVER Abstract A transitionally encoded data signal, which has a DC component and a bipolar AC component, is detected in an asynchronous receiver which includes a filter 16 for separating the AC and DC components into separate circuit paths, an amplifier 22 in the AC path, a feed-forward network 28 in the DC path for establishing a pair of threshold levels Vth+ and Vth- for detecting the positive and negative bipolar pulses, respectively, a dual comparator 26 for comparing the output of the amplifier with each of said threshold levels and for generating an output pulse whenever the thresholds are exceeded, and a flip-flop 34 responsive to the output pulses for reconstructing the binary signal which was transitionally encoded at the transmitter. Use of the receiver in a fiber-optic lightwave system is specifically described (FIG. 4).

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