Fail-safe low-pass filtering circuit

Details Fail-safe low-pass filtering circuit Fail-safe low-pass filtering circuit

1980-10-23

1983-01-11

Mullins, James B.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

307271, 307570, 333174, H03H 710

Patent

active

043684408

ABSTRACT:
A fail-safe active low-pass filter circuit including a plurality of transistor gates having their inputs coupled to a source of a.c. signals, one of a plurality of field-effect transistor switches coupled to an associated one of the plurality of transistor gates, and a variable R-C network having a variable upper a.c. signal passing level which is determined by which one of the associated transistor gates and field-effect switches is rendered conductive by application of d.c. supply voltage.

REFERENCES:
patent: 3582975 (1971-06-01), King
patent: 3868548 (1975-02-01), Grundy
patent: 3883815 (1975-05-01), Grundy
patent: 3889201 (1975-06-01), Grundy
patent: 3890577 (1975-06-01), Grundy

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