Modulators – Frequency modulator – Including stabilization or alternatively distortion – noise...
Patent
1996-07-09
1998-01-27
Grimm, Siegfried H.
Modulators
Frequency modulator
Including stabilization or alternatively distortion, noise...
331 23, 331 25, 331 30, H03C 309, H03L 716
Patent
active
057126020
ABSTRACT:
An VCO generates a high-frequency signal based on a modulating signal and a phase-locking control signal. A first distributor separates the high-frequency signal into two parts, one of which is outputted as an oscillator output signal. An n-multiplier and a microwave amplifier for n-multiplication adjust the level of the reference signal while the frequency of it is multiplied by `n`. A second distributor separates the output from the microwave amplifier for n-multiplication into two parts, one of which is made to be a comparative signal, the other is made to be a locally oscillated signal. A frequency mixer and a microwave amplifier for frequency mixing produce an intermediate frequency signal using the other output from the first distributor and the locally generated signal. The phase comparator compares the intermediate frequency signal with the comparative signal to output an error signal. An LPF generates the phase-locking control signal by removing unwanted signals from the error signal.
REFERENCES:
patent: 4426627 (1984-01-01), Yoshisato et al.
patent: 4797637 (1989-01-01), Kegasa et al.
patent: 5146186 (1992-09-01), Vella
Grimm Siegfried H.
Sharp Kabushiki Kaisha
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