Monolithically integrable, amplitude-controllable oscillator amp

Details Monolithically integrable, amplitude-controllable oscillator amp Monolithically integrable, amplitude-controllable oscillator amp

1988-07-18

1989-07-11

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

331109, 330279, H03F 345, H03G 330

Patent

active

048475670

ABSTRACT:
A monolithically integrable amplitude-controllable oscillator amplifier circuit includes a differential amplifier having capacitors and transistors, some of which form a cascode circuit and some of which are connected to various potentials, as well as a frequency-determining circuit element connected to the oscillator amplifier, amplifier outputs providing output signals and resistors connected to the transistors. A first current source is formed of a series circuit of a second current source, a constant current source and a circuit node. A control circuit for the oscillator amplifier controls amplitude as a function of the output signal and has a control element with a first voltage-controlled current source. A controller provides an actual-value detection by rectification, an input signal mean-value suppression with a differential amplifier, and a set-point setting. The controller feeds a control variable to the first voltage-controlled current source. An operational amplifier and a low-pass filter are provided. 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: 4028638 (1977-06-01), Towle
patent: 4479259 (1984-10-01), Fenk
patent: 4588968 (1986-05-01), Wile
patent: 4621238 (1986-11-01), Fenk
Patent Abstracts of Japan, vol. 10, No. 309, Oct. 21, 1986, p. 27 E 447; & JP-A-61 121 504 (Matsushita Electric Ind. Co. Ltd.), 6/9/86.
Tietze Und Schenk: "Halbleiter-Schaltungstechnik", 1980, Printing 5, pp. 329-333.

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