Patent ID: 7664170
Filing Date: 2010-02-16
Classification: G11B,H04J,H04L

Abstract:
1. A high-speed serial bit stream conditioning circuit controllable to perform operations for a serviced transmit path or a serviced receive path, comprising: an Automatic Gain Control (AGC) loop that includes a gain path having a gain path input and a gain path output and a feedback path having a feedback path input and a feedback path output, wherein the AGC loop receives a high-speed serial bit stream at the gain path input, gain adjusts the high-speed serial bit stream based upon the feedback path output, and produces a gain adjusted high-speed serial bit stream at the gain path output; an adaptive equalizer having an adaptive equalizer input operably coupled to the output of the gain path output of the AGC loop and an adaptive equalizer output, wherein the adaptive equalizer modifies the spectrum of the gain adjusted high-speed serial bit stream based upon signal path attenuation properties to produce an equalized high-speed serial bit stream at the adaptive equalizer output, the adaptive equalizer including: wherein an equalizer feedback loop operably couples to the adaptive equalizer output of the adaptive equalizer to automatically determine spectral shaping control settings used by the adaptive equalizer to modify the spectrum of the gain adjusted high-speed serial bit stream based upon a comparison between the spectral characteristics of the equalized high-speed serial bit stream and reference spectral characteristics, such that upon a favorable comparison, no adjustment is made to the spectral shaping control settings, and upon an unfavorable comparison, an adjustment is made to the spectral shaping control settings; and wherein the feedback path input of the feedback path of the AGC loop operably couples to the adaptive equalizer output of the adaptive equalizer.