Phase locked loop having booster circuit for rapid lockup

Details Phase locked loop having booster circuit for rapid lockup Phase locked loop having booster circuit for rapid lockup

1995-04-24

1996-08-13

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 7093

Patent

active

055460534

ABSTRACT:
A frequency adjusting circuit having a voltage-controlled oscillator in which the lockup time is shortened. The voltage waveform appearing at the two terminals of a resistor element R.sub.1 of a low-pass filter 6 is subject to voltage/current conversion by a voltage/current converter VIC. The charge is stored in capacitor C.sub.3. The voltage generated in capacitor C.sub.3 is input to comparator CMP1 or CMP2. If the voltage generated is higher than a prescribed level, switching elements SW1 and SW2 close. In the same direction as that of the current flowing in capacitor C.sub.2 through resistor element R.sub.1, a charge proportional to the amount of the charge through R.sub.1 flows to capacitor C.sub.2 and is stored in it. In this way, only in the unlocked state of the voltage-controlled oscillator 1 when the pulse (charge) output as fed back to the voltage-controlled oscillator 1 from phase comparator 5 is large, a booster circuit 7 is operated, and it is possible to undergo transition to the locked state of the voltage-controlled oscillator 1 rapidly.

REFERENCES:
patent: 4562411 (1985-12-01), O'Rourke et al.
patent: 5170130 (1992-12-01), Ichihara

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