Frequency synthesizer stage adding high frequency steps to an in

Details Frequency synthesizer stage adding high frequency steps to an in Frequency synthesizer stage adding high frequency steps to an in

1985-10-15

1987-07-21

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 25, 331 38, H03L 718

Patent

active

046821228

ABSTRACT:
A frequency synthesizer for adding large frequency steps to an initial frequency. A first phase lock loop divides the input frequency Fo+.DELTA.(.DELTA. being the sum of smaller frequency steps) by a rational division factor and adds to the result a standard frequency P in a fixed integral ratio with the large frequency steps to form an intermediate frequency Fi. A second phase lock loop (O.sub.S -E-G-D.sub.3 -CPF.sub.2 -FL.sub.3) multiplies the intermediate frequency by a rational factor, equal to (N+1)/D. This second loop first divides (in D.sub.3) the intermediate frequency by an integral fixed ratio D and then compares (in CPF.sub.2) the result Fi/D to a beat between the output frequency Fs and a harmonic N-Fi of the intermediate frequency.

REFERENCES:
patent: 4458329 (1984-07-01), Remy

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