Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1980-04-07
1982-04-06
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
331179, 332 16R, 375 62, H03C 302, H03K 706
Patent
active
043238629
ABSTRACT:
The frequency shift modulator comprises an operational amplifier connected so as to form an integrating circuit and followed by a bistable circuit having trigger hysteresis for producing a two-level voltage which is applied to one end of a first resistor whose other end is coupled to an input of the operational amplifier. Logic means are provided for applying a voltage equal or complementary to the said two-level voltage, depending upon the level of the data signal, to one end of a second resistor whose other end is joined with the said other end of the first resistor. Further logic means are provided for applying a voltage equal or complementary to the said two-level voltage, depending on whether the desired modulated signal has either the one or the other central frequency, to one end of a third resistor whose other end is joined with the joined ends of the first and second resistors. Finally, a common resistor is connected between the joined ends of the three above-mentioned resistors and the input of the operational amplifier.
REFERENCES:
patent: 3835419 (1974-09-01), Milne et al.
patent: 3914694 (1975-10-01), Shawhan
patent: 4039952 (1977-08-01), Huntley
Boudault Robert
Pouzoullic Gerard
Cannon, Jr. James J.
Grimm Siegfried H.
U.S. Philips Corporation
Westin Edward P.
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