Frequency or phase modulation

Details Frequency or phase modulation Frequency or phase modulation

1988-12-21

1989-09-26

Mis, David

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

332144, H03C 300, H03C 308

Patent

active

048703842

ABSTRACT:
A frequency or phase modulator, in particular a DC-coupled frequency modulation synthesizer, comprises a voltage-controlled oscillator (1) in series with a divider (2) in a phase-locked loop, and an analog-to-digital converter (17) connected to control the divider in accordance with an input analog modulation signal. The converter (17), preferably a one-bit charge-balanced converter, has a noise-shaped frequency response to reduce noise at frequencies below the loop-bandwidth.

REFERENCES:
patent: 4543542 (1985-09-01), Owen
patent: 4562414 (1985-12-01), Linder et al.
patent: 4810977 (1989-03-01), Flugstad et al.

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