Phase locked loop using current controlled ring oscillator

Details Phase locked loop using current controlled ring oscillator Phase locked loop using current controlled ring oscillator

1976-12-13

1978-05-23

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 8, 331 25, 331 34, 331 57, 331108C, H03B 304, H03B 502

Patent

active

040913350

ABSTRACT:
A current controlled ring oscillator is utilized in a phase locked loop system. The ring itself is comprised of lateral pnp current sources and Schottky clamped npn transistors to provide a frequency range of 4 megahertz at 50 microamp drive to 43 megahertz at 1 milliamp drive. The frequency of the ring oscillator is varied by varying the current injected into the ring.

REFERENCES:
patent: 3217267 (1965-11-01), Loposer
patent: 3388340 (1968-06-01), Loughry
patent: 3931588 (1976-01-01), Gehweiler
patent: 4004235 (1977-01-01), Roberts

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