Failsafe controlled gain inverting amplifier apparatus

Details Failsafe controlled gain inverting amplifier apparatus Failsafe controlled gain inverting amplifier apparatus

1975-04-29

1976-09-07

Mullins, James B.

Amplifiers

Signal feedback

Phase shift means in loop path

330109, H03F 136

Patent

active

039796906

ABSTRACT:
An inverting amplifier apparatus is disclosed, which provides, in a failsafe manner, a predetermined initial gain that decreases linearly over a known range of frequencies. The disclosed inverting amplifier apparatus includes an amplifier whose feedback impedance contains a four terminal capacitor in parallel with a feedback resistor. The use of a four terminal capacitor as a feedback element makes the amplifier failsafe by preventing a failure mode of the amplifier in which the opening of the feedback element results in infinite AC gain of the amplifier. A virtual ground is provided at the junction of an input resistor, the feedback resistor, and one terminal of the four terminal capacitor, so the amplifier apparatus may simultaneously accommodate multiple input signals thereby permitting the amplifier apparatus to perform summing operations. The linearly decreasing gain of the amplifier apparatus may be altered to a predetermined non-linear gain over a known range of frequency by the introduction of an inductance connected in series with the feedback resistor of the feedback impedance.

REFERENCES:
patent: 3408507 (1968-10-01), Martin
patent: 3774125 (1973-11-01), Condon et al.
brandt, "Active Resonators Save Steps in Designing Active Filters," Electronics, Apr. 24, 1972 pp. 106-110.

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