Methods and apparatus for continuous time linear equalizer tuning using decision feedback equalizer adaptation engine

Abstract

The presently-disclosed solution enables continuous time linear equalizer (CTLE) tuning without needing to perform bit error rate (BER) measurements. Because time consuming BER measurements are avoided, the CTLE tuning may be performed more rapidly as to reduce substantially the time required for link training. Furthermore, this solution re-uses decision feedback equalizer (DFE) adaptation circuitry so as to be highly efficient in its implementation. One embodiment relates to a method that tunes the CTLE based on results from the adaptation of the tap values of the DFE. Another embodiment relates to an apparatus that includes an interface for a control module to control a setting of a CTLE and an adaptation engine for a DFE. The value for the setting of the CTLE is selected using the adapted tapvalue of the DFE as a figure of merit. Other embodiments and features are also disclosed.