Adaptive threshold control circuit and method within high speed receivers
AssigneeLucent Technologies Inc.
InventorJohannes Gerardus Ransijn
Life of this patent
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Abstract
Disclosed is a data regeneration circuit including a decision gate for regenerating a symbol stream (e.g., bit stream) by comparing the amplitude of individual symbols thereof to a decision threshold and outputting a logic level in accordance with each comparison. Threshold optimization circuitry dynamically measures first and second probability distribution points of each symbol, and based on the measurements, optimizes the decision threshold applied to the decision gate. A parallel pseudoerror path including a pseudoerror decision gate and pseudoerror counter may be employed to facilitate the measurements.
Claims20
A data regeneration circuit comprising:
- a main decision gate for regenerating an input symbol stream by comparing the amplitude of individual symbols thereof to a decision threshold and outputting a logic level in accordance with each comparison;
- and
- threshold optimization circuitry operable to dynamically measure first and second probability distribution points of each symbol, and based thereupon, to optimize said decision threshold applied to said decision gate.
An integrated circuit comprising:
- a data regeneration circuit including:
- a main decision gate for regenerating an input symbol stream by comparing the amplitude of individual symbols thereof to a decision threshold and outputting a logic level in accordance with each comparison;
- and
- threshold optimization circuitry operable to dynamically measure first and second probability distribution points of each symbol, and based thereupon, to optimize said decision threshold applied to said decision gate.
A receiver comprising:
- a data regeneration circuit including:
- a main decision gate for regenerating an input symbol stream by comparing the amplitude of individual symbols thereof to a decision threshold and outputting a logic level in accordance with each comparison;
- and
- threshold optimization circuitry operable to dynamically measure first and second probability distribution points of each symbol, and based thereupon, to optimize said decision threshold applied to said decision gate.
A method for setting an optimized decision threshold for application to a main decision gate that performs data regeneration of an input symbol stream based on a comparison of the amplitude of individual symbols thereof to said decision threshold, comprising:
- dynamically measuring first and second predetermined probability distribution points of each symbol;
- and
- computing and setting said optimized decision threshold based upon said measured distribution points.
Dependencies are inferred from the claim text.