Multiple-modulator fractional-N divider

Details Multiple-modulator fractional-N divider Multiple-modulator fractional-N divider

1990-09-07

1991-08-06

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 1A, 455260, H03L 7183

Patent

active

050381172

ABSTRACT:
A fractional-N type frequency synthesizer includes a frequency divider having a selectable integer divide number which is periodically temporarily altered to provide an average rational divide number for the frequency divider. A number of modulator circuits coupled in cascade fashion provide a zero sum modulation signal which varies the value of the frequency divider divisor value such that the net change in divisor value due to the modulation signal is zero thereby reducing phase noise resulting from the temporary altering of the integer divisor value close to the frequency synthesizer carrier frequency.

REFERENCES:
patent: 3928813 (1975-12-01), Kingsford-Smith
patent: 4204174 (1980-05-01), King
patent: 4609881 (1986-09-01), Wells
patent: 4694475 (1987-09-01), Mehrgardt
patent: 4758802 (1988-07-01), Jackson
patent: 4800342 (1989-01-01), Jackson
patent: 4816774 (1989-03-01), Martin
patent: 4918403 (1990-04-01), Martin

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