Programmable frequency synthesizer having a low sensitivity to p

Details Programmable frequency synthesizer having a low sensitivity to p Programmable frequency synthesizer having a low sensitivity to p

1997-11-21

1999-03-09

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

327 7, 331 27, H03L 7085

Patent

active

058806423

ABSTRACT:
A frequency synthesizer SYNT intended to supply an output signal Sout having an output frequency which depends on the average frequency, referred to as symbol frequency, of an input signal Sin beset with a strong phase noise. This synthesizer SYNT includes: a phase/frequency detector PHD comparing the symbol frequency with a predetermined fraction of the output frequency, and supplying a control signal; a low-pass filter LPF filtering the control signal; and an oscillator VCO supplying a signal Sout with a frequency which is adjusted by the filtered control signal Cs. Reference pulses having the symbol frequency are generated within the synthesizer SYNT by means of pulses from an internal clock, which pulses are validated by active states of the input signal Sin.

REFERENCES:
patent: 4864253 (1989-09-01), Zwack
patent: 5621485 (1997-04-01), Terao et al.
patent: 5652769 (1997-07-01), Hiramatsu

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