Frequency/phase modulator using a digital synthesis circuit in a

Details Frequency/phase modulator using a digital synthesis circuit in a Frequency/phase modulator using a digital synthesis circuit in a

2000-03-13

2000-12-19

Grimm, Siegfried H.

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

332144, 455110, H03C 309, H03L 718

Patent

active

061632325

ABSTRACT:
A circuit for generating a modulated signal contains a reference oscillator for generating a reference signal, a digital synthesis circuit having a clock input and an addition value input for generating a synthesis signal, and a phase comparator for generating a tuning signal depending on the result of a comparison of the phase of the reference signal with the phase of the synthesis signal. An oscillator is provided, which is controlled in a manner dependent on the tuning signal and serves for generating the modulated signal and a further oscillator signal, from which a clock signal present at the clock input of the digital synthesis circuit can be derived. The circuit has a drive device, which generates a digital drive signal from carrier frequency and modulation signals. The drive signal being present at the addition value input of the digital synthesis circuit. A circuit of this type provides a modulated signal having a high phase and frequency accuracy, has a low outlay on components and is readily integrable.

REFERENCES:
patent: 5353311 (1994-10-01), Hirata et al.
patent: 5497399 (1996-03-01), Ito

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