Method and circuit arrangement to generate a phase modulated or

Details Method and circuit arrangement to generate a phase modulated or Method and circuit arrangement to generate a phase modulated or

1992-12-23

1994-06-28

Mis, David

Modulators

Phase shift keying modulator or quadrature amplitude modulator

332128, 332144, 331 16, 375 67, H03C 300, H03L 718, H03L 722

Patent

active

053250753

ABSTRACT:
The invention relates to a method, in which a phase modulated or frequency modulated signal can be directly generated with a PLL frequency synthesizer. With an interpolating synthesizer it is possible to create a very dense output frequency (f.sub.x) raster, so that the pulses received in the phase comparator (63) both from the reference signal (f.sub.o) branch and from the voltage controlled oscillator VCO (65) are lengthened in lengthening means (62, 69; 67, 68; k.sub.1, L+.DELTA.L; k.sub.2, L) by a desired amount. The numbers k.sub.1 and k.sub.2 are proportional to the amount of lengthening. When these integers now further are changed proportionally to the modulating signal, the change of the integers causes a change of the time difference of the pulses received by the phase comparator (63). This change of the time difference further causes a change in the output signal (f.sub.x) of the voltage controlled oscillator. The method is particularly well suited to provide digital quadrature phase modulation QPSK or quadrature amplitude modulation QAM, in which the shift from one carrier phase to another has a predetermined size and waveform as a function of time.

REFERENCES:
patent: 3571743 (1971-03-01), Menkes
patent: 4994768 (1991-02-01), Shepherd et al.
patent: 5021754 (1991-06-01), Shepherd et al.
patent: 5027429 (1991-06-01), Kojima
patent: 5053728 (1991-10-01), Bojl
patent: 5079520 (1992-01-01), Rapeli

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