Methods and apparatus for multiple-stage CTLE adaptation

摘要

A method of equalizing an input data signal using a multiple-stage continuous-time linear equalization (CTLE) circuit. A zero-forcing least-mean-square (ZF LMS) procedure is applied to adapt the settings of the CTLE stages. The amplitude settings and the frequency boost settings of the CTLE stages are adapted within the ZF LMS procedure. In an exemplary implementation, an error screening threshold may be applied to an error signal within the ZF LMS procedure to generate a reduced error signal such that weight updates do not occur if the error signal is below the error screening threshold. In addition, if an accumulated sign error signal within the ZF LMS procedure reaches a predetermined maximum indicative of a high loss channel, then a setting for a variable gain amplifier may be increased, and an amplitude setting for the CTLE circuit may be decreased. Other embodiments, aspects and features are also disclosed.

主权项

1. A method of equalizing an input data signal using a continuous-time linear equalization (CTLE) circuit, the method comprising:
receiving the input data signal using the CTLE circuit comprising a plurality of CTLE stages; applying a zero-forcing least-mean-square (ZF LMS) procedure to adapt the settings of the plurality of CTLE stages; adapting amplitude settings of the plurality of CTLE stages within the ZF LMS procedure; adapting frequency boost settings of the plurality of CTLE stages within the ZF LMS procedure; and if an accumulated sign error signal within the ZF LMS procedure reaches a predetermined maximum indicative of a high loss channel, then increasing a setting for a variable gain amplifier and decreasing an amplitude setting for the CTLE circuit.