Patent ID: 8064508
Filing Date: 2011-11-22
Classification: H04L

Abstract:
1. A controllable equalizer, comprising: a first branch including a low pass filter and having a variable first gain, wherein the first branch is configured to produce a first signal by low-pass filtering and applying the first gain to an input signal; a second branch including a high pass filter and having a variable second gain, wherein the first gain and the second gain are independently controllable, the second branch is configured to produce a second signal by high-pass filtering and applying the second gain to the input signal; and at least one current sharing node from which current flows into both the first branch and the second branch during operation of the equalizer, and at least one output node at which the equalizer asserts an equalized signal in response to the input signal, wherein the equalized signal is determined by the sum of the first signal and the second signal, wherein the equalizer has a transfer function having a zero whose location can be controlled by varying one of the first gain and the second gain relative to the other of said first gain and said second gain, and wherein the transfer function has a peak-to-DC gain difference that can be controlled by varying one of the first gain and the second gain relative to the other of said first gain and said second gain.