Active frequency filter cells

Details Active frequency filter cells Active frequency filter cells

1975-06-20

1976-08-17

Mullins, James B.

Amplifiers

Signal feedback

Phase shift means in loop path

330126, H03F 136

Patent

active

039756912

ABSTRACT:
Active filter cells comprising dipoles formed by means of capacitors and resistors having a pair of input terminals and a pair of output terminals, with, in each pair, a grounded first terminal and a non-grounded second terminal. They comprise two elementary networks each of which including: an operational amplifier having first and second inputs, the first of which is connected to a reference potential, and an output; a first dipole connected between said second input terminal of the cell and said second input of said amplifier; a second dipole connected between said second input and said output of said amplifier; and a third dipole connecting said output of said amplifier to said second output terminal of the cell. At least one of said networks contains a fourth dipole connected by one of its terminals to said second input of one of said amplifiers and by its other terminal to said second output terminal of the cell. The above-described arrangement can be combined with a third amplifier, of the differential type, whose output constitutes the output of the cell.

REFERENCES:
patent: 3743957 (1973-07-01), Feistel

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