Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1984-02-13
1985-08-06
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
332 23R, 455 42, 455110, H03C 302
Patent
active
045338825
ABSTRACT:
A frequency modulator comprises an oscillator circuit, a phase shift circuit for phase-shifting an oscillation output of said oscillator circuit by 90 degrees, a multiplier circuit for multiplying an output of the phase shift circuit by a modulating signal, and a phase adder circuit for varying an oscillation frequency of the oscillator circuit by adding the output of the multiplier circuit. The amplification elements of the phase adder circuit and the oscillator circuit are connected in parallel with respect to a power source. The multiplier circuit comprises an amplification element connected to receive the output of the phase shift circuit. A constant current source circuit is connected in series with the amplification element of the multiplier circuit and serves to vary the magnitude of current passing therethrough in accordance with the modulating signal.
REFERENCES:
patent: 3564456 (1971-02-01), Denny, Jr.
patent: 3815052 (1974-06-01), Watatani et al.
Tateshita et al., "IC for RF Modulator in VCR", Toshiba Review, vol. 36, No. 9, pp. 838-842 (Aug., 1981).
Grimm Siegfried H.
Tokyo Shibaura Denki Kabushiki Kaisha
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