Filter circuit and filter integrated circuit

Details Filter circuit and filter integrated circuit Filter circuit and filter integrated circuit

1993-11-12

1996-04-09

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327552, H03K 501

Patent

active

055065422

ABSTRACT:
A filter circuit and a filter integrated circuit capable of being used in a high frequency band includes a first resistor R.sub.1 connected between an input signal source and an emitter of a common-base transistor TR.sub.1, a first capacitor C.sub.1 connected between said input signal source and a reference voltage point, a second capacitor C.sub.2 connected between said input signal source and a collector of the common-base transistor TR.sub.1, and a second resistor R.sub.2 connected between the collector of the common-base transistor and the reference voltage point. Thus, a low-pass filter which operates in a high frequency band and suppresses the influence of characteristic parameters over the filter characteristic can be constructed.

REFERENCES:
patent: 3701033 (1972-10-01), White
patent: 4855627 (1989-08-01), Hitomi
patent: 4877979 (1989-10-01), Sempel
patent: 5130579 (1992-07-01), Thomas
patent: 5293087 (1994-03-01), Hamono et al.

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