Fractional-N synthesizer having modulation spur compensation

Details Fractional-N synthesizer having modulation spur compensation Fractional-N synthesizer having modulation spur compensation

1990-07-16

1991-06-04

Grimm, Siegfried H.

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

331 1A, 331 16, 331 25, 455112, 455119, H03C 300, H03L 7197

Patent

active

050217542

ABSTRACT:
A synthesizer circuit with spur compensation utilizes fractional division in the synthesizer loop. The fractional divider includes means for compensating the spurs when the fractional numerator N=0. The synthesizer includes means for selecting a reference divisor R such that a non zero value of fractional numerator is produced and such that the generated spurs fall below the side band noise limits of the synthesizer's voltage controlled oscillator.

REFERENCES:
patent: 4068199 (1978-01-01), Madoff
patent: 4481489 (1984-11-01), Kurby
patent: 4543542 (1985-09-01), Owen
patent: 4546331 (1985-10-01), Da Silva et al.
patent: 4562414 (1985-12-01), Linder et al.
patent: 4573026 (1986-02-01), Curtis et al.
patent: 4609881 (1986-09-01), Wells
patent: 4686488 (1987-08-01), Attenborough
patent: 4810977 (1989-03-01), Flugstad et al.
patent: 4816774 (1989-03-01), Martin

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