Patent ID: 6104236
Filing Date: 2000-08-15
Classification: H04B,H04J,H04L

Abstract:
A biquadratic equalizer, comprising:a single zero high pass filter comprising first and second metal oxide semiconductor (MOS) transistors, each having first and second junctions and a gate for receiving a corresponding differential input signal, the single zero high pass filter further comprising a single zero impedance circuit connecting the first and second MOS transistors at the corresponding first junctions, the second junctions of the first and second MOS transistors outputting respective differential filtered signals based on the impedance, the differential input signals, and a parasitic pole caused by the first and second MOS transistors; anda single zero, single pole low pass filter comprising:(1) third and fourth MOS transistors, each having a gate for receiving a corresponding one of the differential filtered signals, for outputting first and second current signals, respectively,(2) first and second low pass filters, each having a pole defined by a prescribed resistance and capacitance, for outputting first and second filtered signals based on the pole and in response to the corresponding one of the differential filtered signals, respectively, and(3) fifth and sixth MOS transistors having gates for receiving the first and second filtered signals and in response, outputting third and fourth current signals, respectively, the first, second, third and fourth current signals in combination providing a differential output signal equalized in accordance with a prescribed biquadratic function.