Voltage controlled integrated circuit astable multivibrator

Details Voltage controlled integrated circuit astable multivibrator Voltage controlled integrated circuit astable multivibrator

1980-03-24

1982-06-22

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331 8, 331 34, 331177R, H03K 3282

Patent

active

043365086

ABSTRACT:
Disclosed is an integrated circuit voltage controlled astable multivibrator with external fixed components: resistor RT and capacitor CT. The multivibrator has a center frequency which is a function of: the value of capacitor CT, the amplitude of a constant current Il used to charge and discharge capacitor CT, and a voltage VT. The period timed is proportional to VT/Il where VT is half the voltage swing across capacitor CT. Undesired frequency variations are minimized by generating both current Il and voltage VT in similar matched networks and from the same voltage source so that Il and VT track each other.

REFERENCES:
patent: 3869679 (1975-03-01), Grebene
patent: 3904989 (1975-09-01), Cordell
Cordell et al., "A Highly Stable VCO for Application in Monolithic Phae-Locked Loops", IEEE Journal of Solid State Circuits, vol. SC-10, Dec. 1975, pp. 480-485.
Grebene, "The Monolithic Phase-Locked Loop-A Versatile Building Block", IEEE Spectrum, Mar. 1971, pp. 38-49.

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