HIGH-SPEED SIGNALING SYSTEMS AND METHODS WITH ADAPTABLE, CONTINUOUS-TIME EQUALIZATION

摘要

A receiver includes a continuous-time equalizer, a decision-feedback equalizer (DFE), data and error sampling logic, and an adaptation engine. The receiver corrects for inter-symbol interference (ISI) associated with the most recent data symbol (first post cursor ISI) by establishing appropriate equalization settings for the continuous-time equalizer based upon a measure of the first-post-cursor ISI.

主权项

1. An integrated-circuit receiver to receive a series of symbols over a communication channel, the receiver comprising:
a differential input port to receive a differential signal representing a series of symbols, the input port including a pair of pads; termination elements coupled to the pads to terminate the differential signal; continuous-time gain-control and equalization circuitry coupled to the pads, the circuitry to control gain and equalize a frequency range encompassing interference from a most-recently received symbol in the series of symbols; a decision-feedback equalizer coupled to the gain-control and equalization circuitry, the equalizer to equalize a frequency range only encompassing interference from arising from symbols other than the most-recently received symbol in the series; a data sampler to produce data samples from an equalized signal representing equalization by the gain-control and equalization circuitry and the decision-feedback equalizer; and an adaptation engine to generate a gain control value to adjust the gain provided by the gain-control and equalization circuitry and an equalization-control value to adjust a low-frequency gain of the gain-control and equalization circuitry relative to a high-frequency gain of the gain-control and equalization circuitry.