Broadcom Corporation

Ati Technologies Inc.

Yiwen Yu

Raul Alejandro Casas

Azzedine Touzni

Ajay Bhaskaran

Mark Hryszko

Raghuram Behara

Thomas John Meyer

Supat Wongwirawat

A digital filter pre-calculates C(1)*S(n&#x2212;1), C(2)*S(n&#x2212;2) . . . C(p&#x2212;1)*S(n&#x2212;p+1), prior to the arrival of sample S(n). As such may be calculated as a result of a single further multiply and accumulate operation, upon arrival of the symbol S(n). This, significantly reduces the latency of the filter.

Low latency digital filter and method

A digital receiver, that may be used to receive VSB/QAM digital television signals, includes an adaptive fine carrier recovery circuit that compensates for deviations in the carrier frequency or phase. The carrier recovery circuit de-rotates a signal including phase errors. Estimations of phase errors are filtered using a filter whose gain and bandwidth are adjusted adaptively. This allows the carrier recovery circuit to track phase/frequency offset without introducing significant jitter. In one embodiment, the receiver includes a DFE, and the adaptive carrier recovery circuit mitigates instability that might be associated with the DFE.

Digital receiver having adaptive carrier recovery circuit

Growing community of inventors

Holland, PA, United States of America

Yiwen Yu