Variable frequency oscillator having an output frequency that is

Details Variable frequency oscillator having an output frequency that is Variable frequency oscillator having an output frequency that is

1994-05-27

1995-05-30

Mis, David

Oscillators

Ring oscillators

331 1A, 331 25, 331 34, 331179, H03B 500, H03L 7099

Patent

active

054205468

ABSTRACT:
A digitally controllable oscillator is provided with a variable-frequency ring oscillator including an odd number of inverting circuits connected together in a ring formation. The oscillator has a pulse circulation device to circulate a pulse signal through the inverters to introduce some delay in the signal. Digital data is produced by a data controller device. A counter is connected to the pulse circulation device and counts the number of times the pulse signal circulates through the inverters. A pulse is generated at a desired frequency based upon the counter's output and the introduced delay. A control device determines which of a plurality of delay signals is applied to the circuit that generates the pulse at the desired frequency.

REFERENCES:
patent: 4978927 (1990-12-01), Hausman et al.
patent: 5045811 (1991-09-01), Lewis
patent: 5128624 (1992-07-01), Hoshino et al.
patent: 5331294 (1994-07-01), Watanabe et al.

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