Modulator

Details Modulator Modulator

2007-11-06

2007-11-06

Choe, Henry (Department: 2817)

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

C331S023000

Reexamination Certificate

active

10724117

ABSTRACT:
A modulator according to the invention includes: a PLL circuit that detects a phase difference between an input signal and a reference signal, an AGC circuit that controls a gain of a modulating signal and outputs a control signal, and a voltage controlled oscillation circuit that controls an oscillation frequency of a signal outputted from the PLL circuit on the basis of the control signal. Here, the voltage controlled oscillation circuit includes: a first voltage controlled reactance unit that inputs the signal outputted from the PLL circuit, a second voltage controlled reactance unit that inputs the control signal, and a high-frequency oscillation circuit connected in parallel with the first and second voltage controlled reactance units, which outputs the input signal. Thereby, the invention achieves to provide a modulator capable of compensating the deviation of the modulation factor, even when the frequency of the carrier signal varies.

REFERENCES:
patent: 4510465 (1985-04-01), Rice et al.
patent: 4994768 (1991-02-01), Shepherd et al.
patent: 6476684 (2002-11-01), Park
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patent: 62 (1987)-2813 (1997-01-01), None
patent: 11-068719 (1999-03-01), None

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