Quadrature modulated phase-locked loop

Details Quadrature modulated phase-locked loop Quadrature modulated phase-locked loop

1993-04-26

1994-05-17

Mis, David

Modulators

Phase shift keying modulator or quadrature amplitude modulator

331 12, 331 23, 375 67, 375 60, 375120, H03C 300, H03L 7081

Patent

active

053131738

ABSTRACT:
A phase-locked loop incorporates a quadrature modulator for generating constant envelope phase or frequency modulation. Locating the quadrature modulator within the feedback loop or feeding the output signal of the quadrature modulator into the feedback loop permits accurate constant envelope phase modulation of the loop reference oscillator and completely suppresses undesired AM and PM components of the modulated signal.

REFERENCES:
patent: 4568888 (1986-02-01), Kimura et al.
patent: 4951004 (1990-08-01), Sheffer et al.
patent: 4965533 (1990-10-01), Gilmore
patent: 5079526 (1992-01-01), Heck
patent: 5130671 (1992-07-01), Shahriary et al.
patent: 5146186 (1992-09-01), Vella
patent: 5220292 (1993-06-01), Bianchini et al.

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