Monolithically integrable, amplitude-controllable oscillator amp

Oscillators – Solid state active element oscillator – Transistors

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Details

331116R, 331117R, 331183, 331 46, H03L 500

Patent

active

048433489

ABSTRACT:
A monolithically integrable amplitude-controllable oscillator amplifier circuit includes a differential amplifier. The bases of first, second and third transistors are acted upon by a direct voltage. A first capacitor connects the base of the second transistor to a reference potential. A frequency-determining circuit element is connected to the base of a first transistor, the collector of the second transistor and the oscillator amplifier. The collector of the first transistor is connected directly to the emitter of the third transistor forming a cascode circuit. The collector of the third transistor is connected to a first potential. The collector of the second transistor forms an amplifier output. A first resistor is connected between the collector of the second transistor and a second potential. A first current source is connected between interconnected emitters of the first and the second transistors and the reference potential and it is formed of a series circuit of a second current source, a circuit node and a first constant current source. A circuit controls amplitude based on a signal of the amplifier output and includes a control element having a voltage-controlled current source with a control voltage input, a current input and a current output. A controller feeds a control variable to the control voltage input, the current input is connected to a third potential, and the current output is connected to the first circuit node.

REFERENCES:
patent: 3649929 (1972-03-01), Thompson
patent: 4479259 (1984-10-01), Fenk
patent: 4588968 (1986-05-01), Wile
Patent Abstracts of Japan, vol. 10, No. 309, Oct. 21, 1986, p. 27, E 447; & JP-A-61121504, (Matsushita Electric Ind. Co. Ltd), 09.06.1986.
Tietze & Schenk: "Halbleiter-Schaltwgstechnic", J. Ed. 1980, p. 329, line 18-p. 333, Line 16, FIGS. 14.4, 14.6.

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