Modulators – Frequency modulator – Including stabilization or alternatively distortion – noise...
Patent
1991-11-05
1992-09-29
Grimm, Siegfried H.
Modulators
Frequency modulator
Including stabilization or alternatively distortion, noise...
332136, 455 42, 455110, H03C 308
Patent
active
051516683
ABSTRACT:
A frequency-modulation modulator in a cellular wireless telephone for modulating frequency after uniformly and linearly compensating for frequency characteristics to be suitable for each engaged channel in a cellular wireless telephone. Since frequency modulation characteristics are compensated uniformly and linearly according to each one of a plurality of channels, an error due to the frequency distorted modulation can be prevented and the cellular wireless telephone becomes more reliable. The frequency-modulation modulator includes a controller for providing data to assign the channel by sensing a transmitting/receiving channel, and for generating a switch control signal corresponding to each channel, and of a frequency compensator for compensating for frequency characteristics according to each channel by regulating a gain of an input channel by means of the switch control signal from the controller, and of a capacitance converter for converting a given voltage value from the frequency compensator into a capacitance value, and of a resonator for generating a given resonance frequency with the capacitance value of the capacitance converter, and of a voltage controlled oscillator for generating an oscillation frequency to modulate the corresponding frequency based on the resonance frequency.
REFERENCES:
patent: 4117422 (1978-09-01), Hunt
patent: 5075644 (1991-12-01), Calvin
Bushnell Robert E.
Grimm Siegfried H.
Samsung Electronics Co,. Ltd.
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