Electrically controllable oscillator circuit, and electrically c

Details Electrically controllable oscillator circuit, and electrically c Electrically controllable oscillator circuit, and electrically c

1991-04-12

1992-05-26

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

307521, 331 34, 331132, 331167, 333214, H03B 500

Patent

active

051172054

ABSTRACT:
An electrically controllable oscillator circuit (30) comprises two balanced transconductance circuits (G1, G2), each including transistor pairs arranged as inverters (Inv14) and as resistors (Inv5-6). The oscillation frequency (f) and the quality factor (Q) of the oscillator circuit (30) are controlled by means of a single control signal provided by a combined control circuit (Inv7, Dif, IM1, IM2). The current mirror circuit (IM1, IM2) and a differential pair (Dif) derived the control signal for adjusting the quality factor (Q) from a resistor-connected further transistor pair (Inv7) connected to the control signal for adjusting the frequency (f). The quality factor of an electrically controllable filter arangement including similar transconductance circuits (G-3-9) is adjusted by means of the control signal generated by the control circuit via a buffer circuit (B) and a low-pass circuit (C3).

REFERENCES:
patent: 4145670 (1979-03-01), Bode
patent: 4760353 (1988-07-01), Perkins
patent: 4818903 (1989-04-01), Kawano

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