Modulators – Frequency modulator – Including stabilization or alternatively distortion – noise...
Patent
1992-08-25
1994-10-18
Mis, David
Modulators
Frequency modulator
Including stabilization or alternatively distortion, noise...
307262, 328155, 331 45, 331 60, 331 76, 331176, 375 59, 455 91, H03C 100, H03C 300, H03B 2700, H03L 102
Patent
active
053572211
ABSTRACT:
Electronic apparatus generates first and second output signals having a quadrature phase relationship therebetween. A local oscillator signal with a reference phase is applied as an input to first and second signal branches. The second signal branch includes a phase control circuit for subjecting input signals passing therethrough to a determined phase shift. The phase control circuit is responsive to an applied DC control signal to adjust any phase shift error through the phase shift circuit from a predetermined phase shift to assure that the second output signal exhibits the required quadrature phase relationship to the first output signal. A memory/microprocessor combination stores a digital value that is indicative of a DC control signal which must be applied to the control circuit to alter the phase shift through the phase control circuit to the predetermined phase shift. The microprocessor accesses the digital parameter and applies it to the phase control circuit through a digital to analog converter. The apparatus is included as part of a radiotelephone wherein quadrature signals are required for modulation purposes.
REFERENCES:
patent: 3555458 (1971-01-01), Fombonne
patent: 3921079 (1975-11-01), Heffner et al.
patent: 4475088 (1984-10-01), Beard
patent: 4918405 (1990-04-01), Herleikson
Mis David
Nokia Mobile Phones Ltd.
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