Frequency modulating system including VCD made of transconductan

Details Frequency modulating system including VCD made of transconductan Frequency modulating system including VCD made of transconductan

1996-04-24

1996-04-02

Grimm, Siegfried H.

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

331 2, 331143, 331177R, 348724, 358330, 360 30, 455110, 455119, H03C 309, H03L 7099, H03K 30231, H04N 979

Patent

active

055044638

ABSTRACT:
A frequency modulating system for frequency-modulating an input signal with a predetermined carrier frequency comprising a controller circuit and a frequency modulator is provided. The controller circuit includes an automatic frequency detecting circuit, a voltage controlled oscillator, an error current generator, a feedback clamping circuit, a deviation current generator, and an adder circuit generating a frequency deviation/carrier frequency correction signal provided to the frequency modulator. The frequency modulator modulates the frequency in response to an output of the controller circuit and includes an oscillator having the same structure as that of the voltage controlled oscillator.

REFERENCES:
patent: 5093634 (1992-03-01), Khoury
patent: 5231507 (1993-07-01), Sakata et al.
patent: 5347240 (1994-09-01), Park

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