Oscillator control circuit including a phase difference change-d

Details Oscillator control circuit including a phase difference change-d Oscillator control circuit including a phase difference change-d

1996-03-26

1999-03-23

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 17, 331 25, H03L 7085

Patent

active

058865837

ABSTRACT:
An oscillator with higher frequency stability. The phase arator circuit 17 detects a phase difference between a second-interval reference pulse signal 16 outputted from a GPS receiver 15 and an almost second-interval pulse signal 14 obtained by dividing output of a voltage-controlled oscillator 11 with a counter circuit 13. The delay circuit 31 and the difference calculating circuit 32 determine changes in the phase difference every second, while the averaging circuit 35 determines the mean value of the changes. The control voltage is changed to decrease the mean value of the changes to first match the frequency of the pulse signal 14 with that of the reference pulse signal 16, and the voltage of the control signal at this moment is stored. The voltage of the control signal is then changed to match the phases. The voltage of the control signal is restored to the stored value when the phases match. Since the oscillation frequency is controlled based on the mean value of the changes in the phase difference, the long-term frequency stability of GPS signals is incorporated in the stability of the oscillation frequency of the voltage-controlled oscillator.

REFERENCES:
patent: 4847569 (1989-07-01), Dudziak et al.
patent: 4864253 (1989-09-01), Zwack

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