Balanced biphase transmitter using reduced amplitude of longer pulses
First Claim
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1. A data communication system for transmitting digitally encoded data, comprising:
- an encoder connected to receive nonreturn-to-zero data signals and converting said nonreturn-to-zero signals to biphase signal pulses;
a current mode transmitter for transmitting said biphase signal pulses;
a communication link connected to said transmitter; and
a receiver connected to said communication link for receiving biphase signal pulses and converting said biphase signal pulses into nonreturn-to-zero data signals;
whereinsaid encoder comprises means for sensing transitions in said nonreturn-to-zero data signals, and means for controlling the amplitude of pulses transmitted by said current mode transmitter based on said sensed transitions, said transition sensing means comprising means for inverting and delaying said nonreturn-to-zero data signals, and an exclusive OR gate for receiving said nonreturn-to-zero data signals and said inverted and delayed nonreturn-to-zero data signals, said exclusive OR gate outputting a signal for controlling said amplitude of pulses transmitted by said current mode transmitter.
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Abstract
The data communication system includes an encoder to receive nonreturn-to-zero data signals and convert them to biphase signals, a current mode transmitter for transmitting the biphase signals, and a communication link connected to the transmitter. The encoder senses transitions in the nonreturn-to-zero data signals and controls the amplitude of the biphase signals in response to the sensed transitions. These transitions are sensed by inverting and delaying the nonreturn-to-zero data signals and exclusively ORing these delayed and inverted signals with the nonreturn-to-zero data signals.
40 Citations
14 Claims
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1. A data communication system for transmitting digitally encoded data, comprising:
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an encoder connected to receive nonreturn-to-zero data signals and converting said nonreturn-to-zero signals to biphase signal pulses; a current mode transmitter for transmitting said biphase signal pulses; a communication link connected to said transmitter; and a receiver connected to said communication link for receiving biphase signal pulses and converting said biphase signal pulses into nonreturn-to-zero data signals;
whereinsaid encoder comprises means for sensing transitions in said nonreturn-to-zero data signals, and means for controlling the amplitude of pulses transmitted by said current mode transmitter based on said sensed transitions, said transition sensing means comprising means for inverting and delaying said nonreturn-to-zero data signals, and an exclusive OR gate for receiving said nonreturn-to-zero data signals and said inverted and delayed nonreturn-to-zero data signals, said exclusive OR gate outputting a signal for controlling said amplitude of pulses transmitted by said current mode transmitter. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A data communication system comprising:
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an encoder comprising means for receiving nonreturn-to-zero data signals and converting said nonreturn-to-zero data signals to biphase signal pulses, and means for sensing transitions in said nonreturn-to-zero data signals and outputting an amplitude control signal in response thereto for controlling the amplitude of said biphase signal pulses such that pulses corresponding to a half bit period preceding a change in state of said nonreturn-to-zero data signal and a half bit period following said change in state having a different amplitude than other transmitted pulses, said transition sensing means comprising means for inverting and delaying said nonreturn-to-zero data signals, and an exclusive OR gate for receiving said nonreturn-to-zero data signal and said inverted and delayed nonreturn-to-zero data signal, said exclusive OR gate outputting a signal for controlling said amplitude of pulses transmitted by said current mode transmitter; transmitter means for receiving said amplitude control signal and said biphase pulse signals and transmitting variable amplitude biphase pulses across a communication link in response thereto. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of transitting data across a communication link, comprising:
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receiving nonreturn-to-zero data signals and converting said nonreturn-to-zero data signals to biphase signal pulses; sensing transitions in said nonreturn-to-zero data signals by inverting and delaying said nonreturn-to-zero data signals, exclusively ORing said nonreturn-to-zero data signals and said inverted and delayed nonreturn-to-zero data signals to provide a signal indicating said transitions; and controlling the amplitude of said biphase signals in response to said signal indicating said transitions by producing biphase signal pulses at a low amplitude corresponding to a half bit period preceding a transition of said nonreturn-to-zero data and a half bit period following said transition and producing other biphase signal pulses at a high amplitude. - View Dependent Claims (14)
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Specification