Input buffer with compensated low-pass filter network

Details Input buffer with compensated low-pass filter network Input buffer with compensated low-pass filter network

1992-10-27

1994-06-28

Bertsch, Richard A.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307521, 307572, 307443, H03K 512

Patent

active

053249992

ABSTRACT:
An improved buffer circuit with a low-pass filter includes a first variable resistance which forms the input of the buffer circuit and is connected to a clamp circuit, a variable capacitor, a second variable resistance, a third variable resistance, and a buffer. A first compensation circuit is connected between the buffer and the second variable resistance. A second compensation circuit is connected between the buffer and the third variable resistance. First and second compensation circuits provide feedback paths through the second and third variable resistances which enable the voltage at the node connecting the first variable resistance, the clamp circuit, the variable capacitor, and the buffer to be "pulled up" or "pulled down" depending upon the signal transition at the input thereby following the node voltage a the buffer circuit input more quickly thus reducing recovery time and allowing the buffer circuit to concurrently filter noise and increase switching frequency.

REFERENCES:
patent: 5191245 (1933-03-01), Kang
patent: 5233238 (1993-08-01), Mattos

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