Asynchronous data receiver
First Claim
1. An asynchronous receiver for generating a binary electrical signal from a three-level electrical signal having a DC component and a bipolar AC component superimposed on said DC component, in which a positive pulse of the bipolar component corresponds to one transition of the binary signal and a negative pulse of the bipolar component corresponds to the opposite transition of the binary pulse, characterized byfilter means (16) for separating said DC component from said AC component into separate circuit paths,amplifier means (22) in one of said paths for amplifying said AC component,feed-forward means (28) in the other of said paths for generating from said DC component a pair of voltage thresholds,comparator means (26) for comparing said amplified AC component with each of said thresholds and for generating an electrical pulse whenever said AC component is more positive than one of said thresholds or more negative than the other of said thresholds, andflip-flop means (34) responsive to the output of said comparator means for regenerating said binary electrical signal.
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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 set-reset 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.
32 Citations
8 Claims
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1. An asynchronous receiver for generating a binary electrical signal from a three-level electrical signal having a DC component and a bipolar AC component superimposed on said DC component, in which a positive pulse of the bipolar component corresponds to one transition of the binary signal and a negative pulse of the bipolar component corresponds to the opposite transition of the binary pulse, characterized by
filter means (16) for separating said DC component from said AC component into separate circuit paths, amplifier means (22) in one of said paths for amplifying said AC component, feed-forward means (28) in the other of said paths for generating from said DC component a pair of voltage thresholds, comparator means (26) for comparing said amplified AC component with each of said thresholds and for generating an electrical pulse whenever said AC component is more positive than one of said thresholds or more negative than the other of said thresholds, and flip-flop means (34) responsive to the output of said comparator means for regenerating said binary electrical signal.
Specification