Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1976-11-12
1977-12-13
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
325163, 331 49, 331 56, 331117R, 331179, 332 21, 332 23R, H03C 302
Patent
active
040631974
ABSTRACT:
A frequency modulation oscillator circuit is provided having three or more output frequencies corresponding to three or more possible input signals, the output frequency being a phase continuous frequency modulated signal with no discontinuities. For each desired output frequency, there is an input amplifier, responsive to an input binary signal, the output of that amplifier being summed with the outputs of the other amplifiers. For each input amplifier there is an active feedback network containing a delay element which will produce oscillation in the associated amplifier, the active feedback network from each amplifier being isolated from the other amplifiers and feedback networks. Input amplifiers comprising differential amplifiers emitter coupled to transistor switches are shown together with common base feedback amplifiers emitter coupled to the collectors of one of the transistors comprising the input differential amplifier.
REFERENCES:
patent: 3525054 (1970-08-01), Denney
patent: 3535430 (1970-10-01), Maynard
Stewart, "Parallel-Network Oscillators", Proceedings of the IRE, vol. 43, May 1955, pp. 589-595.
Control Data Corporation
Grimm Siegfried H.
McGinnis, Jr. William J.
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