Direct digital synthesis of precise, stable angle modulated RF s

Details Direct digital synthesis of precise, stable angle modulated RF s Direct digital synthesis of precise, stable angle modulated RF s

1998-02-23

1999-09-14

Grimm, Siegfried H.

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

455113, 455119, H03C 308, H03C 309

Patent

active

059528958

ABSTRACT:
The present invention, generally speaking, provides an RF modulator that allows precise, stable phase shifts to be obtained. The modulator uses a PLL structure including an auxiliary feedforward path used to inject a baseband modulation signal into the PLL at a point past a loop filter of the PLL. A phase demodulator recovers phase information from the output signal of the PLL. The recovered phase information is compared to the phase information of the baseband modulation signal. A resulting error signal is used to control injection of the baseband modulation signal into the PLL, to automatically achieve the correct "dosage." A precise, adaptive, phase-stable modulator results. The adaptation of the modulator compensates for variability of the VCO and other components of the PLL.

REFERENCES:
patent: 4282497 (1981-08-01), Hulbert
patent: 4755774 (1988-07-01), Heck
patent: 5834985 (1998-11-01), Sundegard

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