Oscillator phase control loop having plural switched current sou

Details Oscillator phase control loop having plural switched current sou Oscillator phase control loop having plural switched current sou

1988-10-05

1989-12-05

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 331 17, 331 27, H03L 708, H03L 718

Patent

active

048855529

ABSTRACT:
In a phase control loop of an oscillator circuit having an oscillator (1) whose frequency is dependent on a control current (81), an output signal is obtained from a phase detector (13) in the phase control loop and is applied to a switchable (23, 27) first current-source circuit (29) charging a capacitor (35) from which a control signal is obtained which is applied via a second current-source circuit (63) to a control signal input (81) of the oscillator (1). To render the operation of the circuit less dependent on the frequency of phase variations, the second current-source circuit is also switchable (69, 71) by the phase detector (13).

REFERENCES:
patent: 4244043 (1981-01-01), Fujita et al.
patent: 4774479 (1988-09-01), Tateishi

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