Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1979-10-18
1981-08-25
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
331 23, 332 16R, 455113, H03C 306
Patent
active
042862370
ABSTRACT:
The output frequency of a variable frequency oscillator is compared with that of a reference frequency source by means of a phase detector and the resultant error signal is integrated and applied as a negative feedback signal to the input of the oscillator whereby drift of the oscillator output frequency is minimized. Deviation, modulation index, dynamic stability and linearity are enhanced by means of a pulse generator that is synchronized with a modulating input signal supplied to the oscillator for supplying a keying signal to the phase detector during a portion of each cycle of the modulating input signal.
REFERENCES:
patent: 3393380 (1968-07-01), Webb
patent: 3414842 (1968-12-01), Broadhead, Jr.
patent: 3480883 (1969-11-01), Gaunt, Jr.
patent: 3622913 (1971-11-01), Shipley
patent: 4006429 (1977-02-01), Talbot
patent: 4009455 (1977-02-01), Ishigaki et al.
patent: 4052672 (1977-10-01), Enderby et al.
patent: 4074209 (1978-02-01), Lysobey
Coalter R. G.
Grimm Siegfried H.
RCA Corporation
Tripoli J. S.
Westin Edward P.
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