Packet mode digital data receiver
First Claim
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1. A digital data receiver comprisinga dc-coupled differential input amplifier circuit having first input means for receiving a digital packet data input signal, second input means for receiving a reference signal, and output means for outputting a data output signal;
- a detector means for detecting and storing a peak amplitude of said data output signal and for generating said reference signal; and
reset means, responsive to an end-of-packet reset signal, for discharging said peak amplitude of said data output signal stored by said detector means to a non-zero dc voltage substantially equal to a dc bias voltage which corresponds to a voltage stored by said detector means during an absence of a received data input signal.
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Abstract
A dc-coupled packet mode digital data receiver, for use with an optical bus, uses a peak detector(s) to adaptively establish an instantaneous logic threshold at the beginning of a data burst. A reset circuit resets the peak detector(s) and other circuits of the receiver in response to an end-of-packet reset signal, thereby enabling the reception of closely-spaced burst date packets which have greatly differing power levels.
39 Citations
29 Claims
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1. A digital data receiver comprising
a dc-coupled differential input amplifier circuit having first input means for receiving a digital packet data input signal, second input means for receiving a reference signal, and output means for outputting a data output signal; -
a detector means for detecting and storing a peak amplitude of said data output signal and for generating said reference signal; and reset means, responsive to an end-of-packet reset signal, for discharging said peak amplitude of said data output signal stored by said detector means to a non-zero dc voltage substantially equal to a dc bias voltage which corresponds to a voltage stored by said detector means during an absence of a received data input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A digital data receiver comprising
a dc-coupled differential input amplifier circuit having first input means for receiving a digital packet data input signal, second input means for receiving a first reference signal, and output means for outputting a data output signal; -
detector means for detecting and storing a peak amplitude of said data output signal and for generating said first reference signal; first reset means, responsive to an end-of-packet reset signal, for discharging said data output signal stored by said detector means to a dc bias voltage which is within a predetermined voltage difference of a second reference voltage; and second reset means, responsive to said end-of-packet reset signal, for discharging said peak amplitude of said data output signal stored by said detector means to said second reference voltage wherein said second reference voltage corresponds to a voltage stored by said detector means during an absence of a received data input signal.
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14. 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 output means for outputting a data output signal; -
first detector means for detecting and storing a peak amplitude of said data output signal and for generating said first reference signal; and second detector means for detecting and storing a second peak amplitude of said data output signal and for generating a second reference signal; means, responsive to said first and second reference signals, for shunting a portion of a dc or low frequency current of said data input signal from said first input means; and reset means, responsive to an end-of-packet reset signal, for discharging said first and second peak amplitudes stored, respectively, by said first and second detector means to a non-zero dc voltage substantially equal to a dc bias voltage which corresponds to a voltage stored by said first and second detector means during an absence of a received data input signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. 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 output means for outputting a data output signal; -
first detector means for detecting and storing a first peak amplitude of said data output signal and for generating said first reference signal; second detector means for detecting and storing a second peak amplitude of said data output signal and in response thereto shunting a portion of a current from said data input signal, said current having a frequency which is less than a predetermined frequency; and reset means, responsive to an end-of-packet reset signal, for discharging said first and second peak amplitudes stored, respectively, by said first and second detector means to a non-zero dc voltage substantially equal to a dc bias voltage which corresponds to a voltage stored by said detector means during an absence of a received data input signal.
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28. 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 reference signal, and output means for outputting a data output signal; -
detector means for detecting and storing a peak amplitude of said data output signal and for generating said reference signal; and reset means, responsive to an end-of-packet reset signal, for discharging said data output signal stored by said detector means to a non-zero dc voltage substantially equal to a dc bias voltage which corresponds to a voltage stored by said detector means during an absence of a received data input signal.
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29. 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 first reference signal, and output means for outputting a data output signal; -
first detector means for detecting and storing a peak amplitude of said data output signal and for generating said first reference signal; second detector means for detecting and storing a second peak amplitude of said data output signal and for generating a second reference signal; means, responsive to said first and second reference signals, for shunting a portion of a current of said data input signal from said first input means, said current having a frequency which is less than a predetermined frequency; first reset means, responsive to an end-of-packet reset signal, for discharging said data output signal stored by said first detector means to a dc voltage which is within a predetermined voltage difference of a third reference voltage; and
second reset means, responsive to said end-of-packet reset signal, for discharging said data output signal stored by said second detector means to said third reference voltage wherein said third reference voltage corresponds to a voltage stored by said detector means during an absence of a received data input signal.
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Specification