Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1998-08-26
2000-11-21
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327558, H03K 500
Patent
active
061508756
ABSTRACT:
A network line equalizer includes a transconductance-controlled, tunable single zero, single pole filter that eliminates the necessity of feedback loops or operational amplifiers. The equalizer includes a first MOS transistor having a first size (S1) and a gate for receiving input voltage signal and in response outputting a first current signal. A low pass filter composed of MOS transistors outputs a filtered voltage signal, and a second MOS transistor converts the filtered voltage signal to a second current signal. The second MOS transistor has a size (S2) relative to the first size (S1) such that S2=S1 (z-p)/p, where z is the zero and p is the pole of the filter. The circuit can be duplicated for filtering of differential input voltage signals, where the four current signals can be selectively combined based on whether the zero is at a lower frequency than the pole.
REFERENCES:
patent: 5124673 (1992-06-01), Hershberger
Advanced Micro Devices , Inc.
Le Dinh T.
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