Circuit arrangement for frequency modulation

Details Circuit arrangement for frequency modulation Circuit arrangement for frequency modulation

2011-01-11

2011-01-11

Kinkead, Arnold (Department: 2817)

Modulators

Frequency modulator

C331S17700V, C331S016000, C331S03600C, C331S175000, C331S034000, C332S124000, C332S136000

Reexamination Certificate

active

07868712

ABSTRACT:
A circuit arrangement for frequency modulation is provided, which includes a voltage-controlled oscillator having at least one varactor diode that is driven by a drive signal, wherein a capacitance of the varactor diode depends on the drive signal, includes a modulating unit that creates a modulation signal for frequency modulation of the voltage-controlled oscillator, and includes a drive unit that generates the drive signal for the at least one varactor diode from the modulation signal, wherein the drive unit generates the drive signal from the modulation signal in such a manner that a linear relationship results between the modulation signal and the capacitance of the varactor diode.

REFERENCES:
patent: 4003004 (1977-01-01), Fletcher et al.
patent: 4003034 (1977-01-01), Au
patent: 4117422 (1978-09-01), Hunt
patent: 4140981 (1979-02-01), Bergmann
patent: 1238205 (1989-09-01), None

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