Frequency multiplying device and digitally-controlled oscillator

Details Frequency multiplying device and digitally-controlled oscillator Frequency multiplying device and digitally-controlled oscillator

1997-02-12

1998-01-13

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 25, 331 57, 327107, 327159, H03L 7085

Patent

active

057083959

ABSTRACT:
A frequency multiplying device which multiplies the frequency of an externally-supplied reference signal PREF includes a digitally-controlled oscillation circuit, which includes a ring oscillator formed of thirty-two inverting circuits in a ring configuration which are adapted to generate sixteen clock signals having a period that is thirty-two times the inversion time of each inverting circuit and a phase interval that is twice the inverting circuit inversion time, and produces an output signal POUT having a period that corresponds to frequency control data CD at a resolution of the phase difference time of the clock signals, a counter/data-latch circuit which counts the clock signal RCK released by the ring oscillator within one period of the reference signal PREF and delivers the frequency control data CD of the count value to the digital oscillation circuit, and a control circuit which controls the operation of the circuits so that the oscillation output signal POUT having the frequency of the reference signal PREF multiplied by sixteen (32/2) is generated by the digital oscillation circuit.

REFERENCES:
patent: 5045811 (1991-09-01), Lewis
patent: 5128624 (1992-07-01), Hoshino et al.
patent: 5331294 (1994-07-01), Watanabe et al.
patent: 5416444 (1995-05-01), Yamauchi et al.
patent: 5477196 (1995-12-01), Yamauchi
patent: 5517155 (1996-05-01), Yamauchi et al.
patent: 5525939 (1996-06-01), Yamauchi

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