Tuned ring oscillator

Details Tuned ring oscillator Tuned ring oscillator

1990-02-02

1991-09-03

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 331 2J, 331 57, 331DIG3, H03B 500

Patent

active

050458116

ABSTRACT:
An oscillator circuit is tuned to the frequency of reference pulses, for example, the spindle index pulses of a rotating magnetic storage system. A ring oscillator circuit includes a series transmission gate. The transmission gate is controlled by the output signal from a programmable delay line to interrupt operation of the ring oscillator and, in effect, provide fine tuning of the ring oscillator frequency in programmed steps. The output signal of the ring oscillator is divided down in a programmable divider, which provides a coarse frequency adjustment for an output pulse signal provided by the divider. Output signals from the divider are also provided as inputs to the programmable delay line. The frequency of the output pulse signal is compared to the frequency of the reference pulses to generate control signals for the programmable delay line. The control signals are generated by a microprocessor.

REFERENCES:
patent: 4494021 (1985-01-01), Bell et al.
patent: 4902986 (1990-02-01), Lesmeister
Mead et al., Introduction To VLSI Systems, Addison-Wesley, Reading Massachusetts, Oct. 1980, pp. 233-236.

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