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US 5,430,766 AGranted
Burst mode digital data receiver
AssigneeAT&T Corp.
InventorsYusuke Ota, Robert G. Swartz
Life of this patent
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Abstract
A dc-coupled packet mode digital data receiver, for use with an optical bus uses peak detectors to adaptively establish an instantaneous logic threshold at the beginning of a data burst. A dc compensator, responsive to outputs of the peak detectors, shunts dc or low frequency currents, corresponding to "dark level" optical signals, from the input of the receiver.
Claims18
A digital data receiver comprising
- a dc-coupled differential input amplifier circuit having first input means for receiving a digital data input signal, second input means for receiving a first reference signal, and differential output means for outputting a positive and a negative data output signals;
- first detector means for detecting a first polarity peak amplitude of said positive data output signal and for generating said first reference signal;
- second detector means for detecting a second polarity peak amplitude of said negative data output signal and for generating a second reference signal, said first and second polarities being the same;
- and
- proportional means, responsive to a difference of said first and second reference signals, for continuously subtracting a proportional amount of a low frequency current of said data input signal from said first input means.
2 more elements
The receiver of claim I wherein said second detector means includes
- means for storing said second polarity peak amplitude of said data output signal and
- amplifier means for controlling the discharge rate of said means for storing.
A digital data receiver comprising
- a dc-coupled differential amplifier circuit having first input means for receiving a digital data input signal, second input means for receiving a reference signal, and differential output means for outputting a first and second polarity data output signals;
- first detector means for detecting a peak amplitude of said first polarity data output signal and for generating said reference signal;
- and
- second detector means for detecting a difference between a first and second peak amplitudes of said first and second polarity data output signals, respectively, said first and second peak amplitudes being of the same polarity, and in response thereto continuously subtracting a proportional amount of a low frequency current from said data input signal at said first input means.
1 more element
A digital data receiver comprising
- a dc-coupled differential amplifier circuit having first input means for receiving a digital data input signal, second input means for receiving a reference signal, first output means for outputting a first data output signal and a second output means for outputting a second data output signal;
- first detector means for detecting a first polarity peak amplitude of said first data output signal and for generating said reference signal;
- second detector means for detecting a second polarity peak amplitude of said second data output signal, said first and second polarity being the same;
- and
- means, responsive to a difference signal from said first and second detector means, for continuously subtracting a portion of said data input signal from said first input means.
2 more elements
A digital data receiver comprising
- a dc-coupled amplifier circuit having first input means for receiving a digital data input signal, having a dc current component, second input means for receiving a first reference signal, and in response thereto generating a positive and negative data output signals;
- first detector means for detecting a first peak amplitude of said first data output signal and for generating said first reference signal;
- and
- second detector means for detecting a difference between a first polarity peak amplitude of said positive data output signal and said first polarity peak amplitude of said negative data output signal and for generating a second dc current which is continuously subtracted from said dc current component of said data input signal.
1 more element
An optical signal receiver comprising
- means for receiving a digital optical signal,
- means for converting the received digital optical signal into an electronic data signal,
- a dc-coupled differential input amplifier circuit having first input means for receiving said electronic data signal, second input means for receiving a first reference signal, and differential output means for outputting first and second data output signals;
- first detector means for detecting a first peak amplitude of said first data output signal and for generating said first reference signal;
- and
- second detector means for detecting a difference between a first polarity peak amplitude of said first data output signal and said first polarity peak amplitude of said second data output signal and in response thereto continuously subtracting a proportional amount of a low frequency current from said data input signal at said first input means.
3 more elements
Dependencies are inferred from the claim text.