Monolithically integrable controller circuit

Details Monolithically integrable controller circuit Monolithically integrable controller circuit

1988-07-18

1989-06-27

Mullins, James B.

Amplifiers

With plural amplifier channels

Amplifying different frequencies in different channels

328 26, 330295, H03F 368

Patent

active

048433403

ABSTRACT:
A monolithically integrable controller circuit, particularly for amplitude control in oscillator amplifiers, providing an actual-value detection by rectification, an input signal means-value suppression with a differential amplifier, and a set-point setting, includes a signal input of the controller circuit connected to the base contact of a first transistor. A low-pass filter is connected to the base contact of a second transistor and to the signal input. The collector contacts of the first and second transistors are connected to a potential. The emitter contact of the first transistor is connected to one of the inputs of the operational amplifier. A first capacitor is connected between the emitter contact of the first transistor and reference potential. A first constant current source is connected between the emitter contact of the first transistor and reference potential. The emitter contact of the second transistor is connected to the other of the inputs of the operational amplifier. A second constant current source is connected between the emitter contact of the second transistor and the reference potential. An output of the controller is connected to the output of the operational amplifier. The ratio of the current of the second constant current source to the current of the first constant current source provides set-point setting.

REFERENCES:
patent: 4479259 (1984-10-01), Fenk
patent: 4513320 (1985-04-01), Reneau et al.
patent: 4588968 (1986-05-01), Wile

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