Modulators – Frequency modulator – Including stabilization or alternatively distortion – noise...
Patent
1995-04-24
1996-09-17
Mis, David
Modulators
Frequency modulator
Including stabilization or alternatively distortion, noise...
331 2, 331 17, 331 18, 331 23, 331 36C, 331177V, 327156, 375376, 455 75, 455113, 455208, 455260, 329325, H03L 300, H03L 706, H03L 7099, H03D 300
Patent
active
055572448
ABSTRACT:
A transceiver (10) includes a dual port phase and magnitude balanced synthesizer modulator (60). The modulator (60) couples a modulation input to a voltage controlled oscillator (40) and to a reference oscillator (42) that are coupled together in a phase locked loop (44). The modulator 60 includes a magnitude balancing circuit (64) that divides a modulation input representing data or the like into a first modulation input signal applied to the reference oscillator (42) and a second modulation input signal for the voltage controlled oscillator (40). A phase balancing circuit (68) induces a negative phase shift in the second modulation input signal that is coupled to the voltage controlled oscillator (40) in order to compensate for the phase lag of the reference oscillator loop (44).
REFERENCES:
patent: 3622913 (1971-11-01), Shipley
patent: 4074209 (1978-02-01), Lysobey
patent: 4447792 (1984-05-01), Wynn
patent: 5126699 (1992-06-01), Kabler
patent: 5323125 (1994-06-01), Hiben et al.
Chanroo Keith A.
Mis David
Motorola Inc.
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