Frequency synthesizer of the phase lock loop type

Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural a.f.s. for a single oscillator

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331 17, 331 25, H03B 304

Patent

active

040244644

ABSTRACT:
A frequency synthesizer of the phase lock loop type including a reference frequency source, a voltage-controlled oscillator and a frequency divider connected to the oscillator output to divide the output frequency by a selectively-variable integer N. The outputs of the frequency divider and the reference frequency source are applied to a phase comparator which has an output connected to a filter. The filter output is applied through a multiplier, having a multiplication factor n proportional to N, to the input of the voltage controlled oscillator. The frequency divider and the multiplier are controlled by the same control means in order to keep the loop gain constant, irrespective of the amount of change in N.

REFERENCES:
patent: 3337814 (1967-08-01), Brase et al.
patent: 3413565 (1968-11-01), Babany et al.
patent: 3551826 (1970-12-01), Sepe
patent: 3729688 (1973-04-01), Cerny, Jr. et al.

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