Low frequency filter in a monolithic integrated circuit

Details Low frequency filter in a monolithic integrated circuit Low frequency filter in a monolithic integrated circuit

1992-04-20

1992-12-01

Sikes, William L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307543, 3072961, 3072966, 3072968, 328167, H03B 104, H03K 301

Patent

active

051681803

ABSTRACT:
A low-pass filter circuit is disposed on a monolithic integrated circuit. An operational amplifier receives a reference potential and drives three parallel stacked diode paths into a current supply. One of the stacked diode paths conducts the vast majority of the current allowing the transistors of the other two stacked diode paths to operate in a sub-threshold region and represent an extremely high resistance. The high resistances in combination with a low value capacitor realizes a low-pass filter on the monolithic integrated circuit.

REFERENCES:
patent: 4684832 (1987-08-01), Little et al.
patent: 4890065 (1989-12-01), Laletin
patent: 5051628 (1991-09-01), Hanna
patent: 5087891 (1992-02-01), Cytera
patent: 5124631 (1992-06-01), Terashima

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