Integrated high gain voltage controlled oscillator

Details Integrated high gain voltage controlled oscillator Integrated high gain voltage controlled oscillator

1986-10-29

1987-09-15

LaRoche, Eugene R.

Oscillators

Ring oscillators

331108C, H03B 100

Patent

active

046942610

ABSTRACT:
A voltage controlled oscillator is formed of a plurality of cascaded inverter stages in a ring configuration. Each inverter stage is a grounded emitter circuit having an active pull-up stage in order to achieve a short stage delay. The frequency of the ring oscillator is determined by the number of inverter stages, and the gain is selectable by coupling an external control voltage to only certain of the inverters. The VCO may be fabricated on a single integrated circuit along with the other circuits necessary to form a phase locked loop or other frequency generation system.

REFERENCES:
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patent: 4131861 (1978-12-01), Malaviya
patent: 4244043 (1981-01-01), Fujita et al.
patent: 4255722 (1981-03-01), Hochstrate
patent: 4468632 (1984-08-01), Crowley
patent: 4513427 (1985-04-01), Boriello et al.
patent: 4517532 (1985-05-01), Neidorff
patent: 4529894 (1985-07-01), Chan et al.

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