Phase-locked oscillator arrangement

Details Phase-locked oscillator arrangement Phase-locked oscillator arrangement

1995-03-01

1996-01-16

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 1A, 331 8, 331 25, 327 7, 327157, H03L 7089

Patent

active

054851254

ABSTRACT:
A phase-locked variable frequency oscillator arrangement includes a voltage controlled oscillator (VCO) which is controlled by a control signal produced by charging or discharging of a capacitor in a charge pump circuit, the charge pump circuit including current sources driven by up or down command signals from a phase detector which detects the phase of the VCO output. When the command signals are simultaneously active, a logic gate circuit supplies a reset pulse to the phase detector via a delay device which is adapted to the rise times of the current in the current sources. The delay device includes a transistor (the "annexed" transistor) which forms a switched pair with one of the transistors which form the current sources. The reset signal is produced when the current of the annexed transistor reaches a selected fraction of its normal current, after being turned on by the logic gate circuit. Such circuit arrangement avoids a so-called "dead zone" of uncorrectable small phase errors around a nominal zero phase shift condition.

REFERENCES:
patent: 4814726 (1989-03-01), Byrd et al.
patent: 5095287 (1992-03-01), Irwin et al.

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