RECEIVER WITH TIME-VARYING THRESHOLD VOLTAGE
First Claim
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1. An apparatus, comprising:
- an input node to receive a signal representing a series of logical values, wherein a given logical value is within a corresponding bit-duration;
a threshold generator circuit to generate a time-varying threshold voltage during the bit-duration; and
a slicer, coupled to the input node and the threshold generator circuit, to resolve the logical values from the signal based at least on the time-varying threshold voltage.
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Abstract
A system for communicating information between circuits is described. A transmit circuit provides pulse-amplitude-modulation (PAM) signals via a communication channel to a receiver. A circuit in the receiver determines digital values from the received signals using a time-varying threshold voltage, which varies during the bit-time. This approach may compensate for inter-symbol interference (ISI) to increase the voltage and timing margins of the system.
78 Citations
28 Claims
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1. An apparatus, comprising:
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an input node to receive a signal representing a series of logical values, wherein a given logical value is within a corresponding bit-duration; a threshold generator circuit to generate a time-varying threshold voltage during the bit-duration; and a slicer, coupled to the input node and the threshold generator circuit, to resolve the logical values from the signal based at least on the time-varying threshold voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An apparatus, comprising:
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an input node to receive a signal that representing a series of logical values, wherein a given logical value is within a corresponding bit-duration; a threshold generator circuit to generate a time-varying threshold voltage during the bit-duration; and a means, coupled to the input node and the offset-voltage generator circuit, for determining the logical values from the received signal based at least on the time-varying threshold voltage.
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24. An apparatus, comprising:
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an input node to receive a signal representing a series of logical values, wherein a given logical value is within a corresponding bit-duration; a threshold generator circuit to generate a time-varying threshold voltage during the bit-duration; and a decision circuit to determine the logical values from the received signal based at least on the time-varying threshold voltage, wherein the decision circuit includes two instances of; a difference circuit, coupled to the input node, to compare the received signal and a given time-varying threshold voltage in the pair of time-varying threshold voltages; an integrator circuit, coupled to the difference circuit, to integrate the comparison result of the received signal and the given time-varying threshold voltage; and a slicer, coupled the integrator circuit, to determine the digital values; and
wherein the decision circuit further comprises a feedback circuit that includes;a memory to store a digital value from an immediately preceding bit-duration; and a multiplexer, coupled to the memory and slicers in the first and second instances of the difference circuit, the integrator circuit, and the slicer, to select an output from one of the slicers during a current bit-duration based at least on the stored digital value in the memory. - View Dependent Claims (25)
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26. A system, comprising:
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a transmitter to provide a signal, which corresponds to a data sequence that is characterized by a series of logical values, wherein a given logical value is within a corresponding bit-duration; a communication channel, coupled to the transmitter, to convey the signal; and a receiver, coupled to the communication channel, wherein the receiver includes a circuit to determine digital values corresponding to the data sequence from the received signal, and wherein the circuit has a time-varying threshold voltage during the bit-duration. - View Dependent Claims (27)
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28. A method for determining digital values from a signal representing a series of logical values, wherein a given logical signal is within a corresponding bit-duration, the method, comprising:
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using a digital receiver to receive the signal; comparing the signal to a time-varying threshold voltage, wherein the time-varying threshold voltage varies during the bit-duration; and determining the digital values from the comparison of the received signal and the time-varying threshold voltage.
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Specification