Frequency modulating system including feedback clamping circuit

Details Frequency modulating system including feedback clamping circuit Frequency modulating system including feedback clamping circuit

1995-04-24

1996-05-14

Grimm, Siegfried H.

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

331 2, 348724, 358330, 360 30, 455110, 455119, H03C 309, H03L 706, H04N 980

Patent

active

055171591

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: 5231507 (1993-07-01), Sakata et al.
patent: 5267023 (1993-11-01), Kawasaki
patent: 5347240 (1994-09-01), Park

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