Frequency synthesizer having a loop filter with a high cut-off f

Details Frequency synthesizer having a loop filter with a high cut-off f Frequency synthesizer having a loop filter with a high cut-off f

1979-06-01

1981-03-24

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 25, H03L 708

Patent

active

042583330

ABSTRACT:
This synthesizer comprises a phase-locked main loop, a frequency searching loop, a first digital loop for forming steps equal to the reference frequency F and a second digital loop for forming steps equal to the frequency F/Q, Q being an integer. According to the invention this synthesizer further comprises a third digital loop which acts on the setting of the steps having value F for forming the steps having a frequency F/R, R being an integer near Q. The elementary frequency step of the synthesizer has the frequency value .vertline.F/Q-F/R.vertline. or a value equal to a submultiple of the last-mentioned value. This spurious modulation at the frequency OR/.vertline.Q-R.vertline. F of the output signal of the phase comparator has an amplitude which is sufficiently low to make filtering unnecessary.

REFERENCES:
patent: 3753141 (1973-08-01), Van Elk et al.
patent: 3806826 (1974-04-01), Schlosser
patent: 4179670 (1973-12-01), Kingsbury

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