Frequency modulator

Details Frequency modulator Frequency modulator

H - Electricity

03

C

332/36

H03C 3/02 (2006.01) H03C 3/06 (2006.01) H03C 3/09 (2006.01) H03L 7/02 (2006.01)

Patent

CA 2021335

A frequency modulator is formed in a monolithic integrated circuit as a whole. A direct current signal from a center frequency control circuit and an alternating current signal from a voltage controlled amplifier (VCA) which receives a modulation signal and outputs the alternating current signal are applied to a control input of a voltage controlled oscillator (VCO). A center frequency (Fo) of the VCO is determined by the direct current signal from the center frequency control circuit and a frequency deviation amount (.DELTA. f) of the VCO is determined by the alternating current signal from the VCA, and therefore, a frequency-modulated signal of Fo + .DELTA. f can be outputted from the VCO. The direct current signal from the center frequency control circuit is also applied to a control input of the VCA, and therefore, the center frequency of the VCO as well as an amplitude of the alternating current signal, that is, the frequency deviation amount can be controlled by only the direct current signal.

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