Multiple-multiple modulus prescaler for a phase-locked loop

Details Multiple-multiple modulus prescaler for a phase-locked loop Multiple-multiple modulus prescaler for a phase-locked loop

1984-08-07

1986-02-25

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 16, 331 25, 377 48, H03L 718, H03K 2100

Patent

active

045730237

ABSTRACT:
A three modulus prescaler for a phase-locked loop frequency synthesizer includes a N.sub.0 modulus prescaler inputting into a divide-by-two circuit. A microprocessor and internal logic control a three modulus prescaler synchronizer to receive signals from the divide-by-two circuit and output control commands to the N.sub.0 modulus prescaler so as to cause the N.sub.0 modulus prescaler to divide solely by a first or second modulus, or alternately between said first and second modulus, between output pulses of the divide-by-two circuit to extend the synthesizer's bandwidth.

REFERENCES:
patent: 3959737 (1976-05-01), Tanis
patent: 4123724 (1978-10-01), Das et al.
patent: 4344045 (1982-08-01), Das et al.
patent: 4360788 (1982-11-01), Erps et al.
Motorola Application Note AN-827, "The Technique of Direct Programming by using a Two-Modulus Prescaler", Motorola Inc., 1981.

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