Band-pass high-order analog filter backed hybrid receiver equalization

摘要

A channel equalization scheme is provided. A linear equalizer using a continuous-time linear equalization and a decision feedback equalizer using a discrete-time decision feedback equalization are integrated together from a hybrid receiver equalizer. The continuous-time linear equalization scheme and the discrete-time decision feedback equalization scheme are blended using a joint adaptation algorithm to form an equalization scheme for inter-symbol interference cancellation in the hybrid receiver equalizer. The hybrid receiver equalizer controls crosstalk while maintaining signal bandwidth and linearity of a signal by the high-order high frequency roll-off of the linear equalizer used. Using this configuration, the hybrid receiver equalizer eliminates the need for adaptive bandwidth controller used in conventional low-pass receiver equalization schemes. The hybrid receiver equalizer can be used in receivers for dual-speed simultaneous transmission on the same physical link. The hybrid receiver equalizer can also be used in receivers for simultaneous forward and back-channel transmission using differential-signaling in multi-Gbps transceivers.

主权项

1. A hybrid receiver equalizer in a system comprising:
a first circuit that produces linear equalization, wherein the first circuit includes a component that implements an adjustable high-pass function, a variable gain linear amplifier, and an analog adaptive linear equalizer that uses continuous-time linear equalization, wherein the variable gain linear amplifier is connected directly to the component and directly to the analog adaptive linear equalizer, and wherein the variable gain linear amplifier is connected between the component and the analog adaptive linear equalizer; and a second circuit that includes an adaptive decision feedback equalizer that implements a discrete-time decision feedback equalization, wherein the second circuit receives an output of the analog adaptive linear equalizer of the first circuit, and wherein the first and second circuits provide for cancellation of inter-symbol interference to provide an equalization scheme that provides a band-pass function.