Modulators – Frequency modulator
Patent
1996-08-23
1998-06-16
Mis, David
Modulators
Frequency modulator
332135, 331 34, 331177R, 455113, H03C 300
Patent
active
057677522
ABSTRACT:
A frequency modulator controls the center frequency and modulation factor at the same time with one control signal. The frequency modulator includes a voltage-to-current converter that receives an input voltage signal to be modulated, a reference voltage signal, and a control voltage signal, and generates an output current signal by combining the input voltage signal and the control voltage signal. The input voltage signal is amplified by a transconductance amplifier. The control voltage signal is converted into a gain signal which is used to vary the transconductance of the amplifier. A voltage controlled oscillator generates a frequency modulated signal responsive to the output current signal. The center frequency and modulation factor can be controlled by adjusting the value of a resistor in the current-to-voltage converter, a capacitor in the voltage control oscillator, or the control voltage signal.
REFERENCES:
patent: 5105169 (1992-04-01), Yamazaki et al.
patent: 5142249 (1992-08-01), Hirotomi
patent: 5216390 (1993-06-01), Erftemeijer
patent: 5359298 (1994-10-01), Abe
patent: 5463353 (1995-10-01), Countryman et al.
Mis David
Samsung Electronics Co,. Ltd.
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