Oscillation circuit including a ring oscillator having a changea

Details Oscillation circuit including a ring oscillator having a changea Oscillation circuit including a ring oscillator having a changea

1992-10-02

1994-07-19

Mis, David

Oscillators

Ring oscillators

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

Patent

active

053312945

ABSTRACT:
A digitally controllable oscillator is provided with a variable-frequency ring oscillator comprising an odd number of inverting circuits connected to each other in a ring. The frequency of the output signal of the ring oscillator is determined by a digital input signal specifying the frequency of the output signal of the ring oscillator. The number of times of circulation of a pulse signal through the ring oscillator is counted. A pulse generator generates a pulse signal upon the coincidence of the counted number of times of circulation of the pulse signal through the ring oscillator with a number corresponding to the digital input signal. A series of these operations is repeated to make the pulse generator generate pulse signals successively at a period corresponding to the digital input signal.

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

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