Modulators – Frequency modulator – Plural modulation
Patent
1995-10-05
1997-01-28
Grimm, Siegfried H.
Modulators
Frequency modulator
Plural modulation
332144, 331 39, 331 78, H03C 300, H03B 2900
Patent
active
055981305
ABSTRACT:
An FM signal generator generates an FM signal obtained by frequency-modulating a reference frequency signal with a modulating frequency signal. A first mixer mixes the FM signal and an input signal having a predetermined carrier frequency and outputs a pair of frequency signals having sum and difference frequencies thereof. A first signal extracting unit extracts one of the pair of frequency signals as an intermediate frequency signal. A delay circuit delays the extracted intermediate frequency signal by a predetermined time. A second mixer mixes the delayed intermediate frequency signal and the FM signal and outputs a pair of frequency signals having sum and difference frequencies. A second signal extracting unit extracts the frequency signal of the pair of frequency signals which corresponds to the carrier frequency component as a phase-modulated signal. The modulation degree and modulation frequency in phase modulation for the phase-modulated signal can be set in wide ranges.
REFERENCES:
patent: 3706946 (1972-12-01), Bickford et al.
patent: 4810977 (1989-03-01), Flugstad et al.
patent: 4916411 (1990-04-01), Lymer
Mesuda Etsuji
Tagiri Osamu
Anritsu Corporation
Grimm Siegfried H.
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