Frequency modulator using a waveform generator

Details Frequency modulator using a waveform generator Frequency modulator using a waveform generator

2005-03-29

2005-03-29

Kinkead, Arnold (Department: 2817)

Modulators

Phase shift keying modulator or quadrature amplitude modulator

C332S104000, C375S302000, C375S305000, C375S274000

Reexamination Certificate

active

06873218

ABSTRACT:
A Multi-mode Loop Frequency modulator (10) for modulating a carrier signal according to various modulation pulse shapings and data signal to provide a modulated output signal (VCOout), comprises a waveform generator (12) and two multiplexors (14,38) to perform various pulse shaping filtering and or predistord the pulse shaping filter impulse response for either a dual port modulation or for a single port modulation. The waveform generator (12) can also provide interpolation to input frequency deviation and also provide scaling for various reference frequency clock provided by the crystal (30) and the reference divider (28). The low pass filter (22) is used for providing the PLL loop filtering and also as the smoothing filter for the high port DAC (18).

REFERENCES:
patent: 5107520 (1992-04-01), Karam
patent: 5548541 (1996-08-01), Bierman
patent: 5648987 (1997-07-01), Yang
patent: 5805480 (1998-09-01), Greenberg
patent: 5825257 (1998-10-01), Klymyshyn et al.
patent: 6420940 (2002-07-01), Minnis et al.
patent: 0408238 (1991-01-01), None
patent: WO 9907065 (1999-02-01), None

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