Apparatus and method for equalizing received network signals using a transconductance controlled single zero single pole filter

A differential input filter having a zero and a pole, the filter comprising:

• a first metal oxide semiconductor (MOS) transistor having a first size and a gate for receiving a first differential input voltage signal, the first MOS transistor in response outputting a first current signal;
• a second MOS transistor having said first size and a gate for receiving a second differential input voltage signal having an inverse polarity relative to the first differential input voltage signal, the second MOS transistor in response outputting a second current signal;
• first and second low pass filters outputting first and second filtered voltage signals in response to the first and second differential input voltage signals, respectively, the first and second low pass filters each outputting the corresponding filtered voltage signal based on a pole defined by a prescribed resistance and a prescribed capacitance,
• third and fourth MOS transistors each having a second size relative to the first size by a prescribed relation between the pole and the zero, the third MOS transistor having a gate for receiving the first filtered voltage signal and in response outputting a third current signal, the fourth MOS transistor having a gate for receiving the second filtered voltage signal and in response outputting a fourth current signal, the first, second, third and fourth current signals providing a differential output signal equalized in accordance with the zero and the pole.

A method of equalizing an input signal according to a single zero and a single pole, the method comprising:

• first outputting a first current signal from a first metal oxide semiconductor (MOS) transistor in response to receiving an input voltage signal at a corresponding gate, the MOS transistor having a first size;
• second outputting a filtered voltage signal from a low pass filter in response to receiving the input voltage signal, the low pass filter having a pole defined by a prescribed resistance and a prescribed capacitance;
• third outputting a second current signal from a second MOS transistor in response to receiving the filtered voltage signal, the second MOS transistor having a second size relative to the first size by a prescribed relation between the pole and a transfer function zero;
• and supplying the first and second current signals to obtain a filtered signal.