Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1983-07-06
1985-05-07
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
331143, 331177R, 375 65, H03B 520, H03C 302, H04L 2712
Patent
active
045160864
ABSTRACT:
A modulator transmitting an analog data signal by variation of the frequency of an oscillator comprising an integrator (1, 2) and a bistable circuit with trigger hysteresis (8 to 13). The two-level voltage from the bistable circuit, taken to a terminal of a resistor network (6, 7, 30) connected to the input of the integrator, is formed from the potential O and the potential kU, which is lower than the supply voltage U, applied respectively to the inputs of two analog switches (12, 13) whose outputs are connected to the output of the bistable circuit. The data signal v.sub.e is applied to the input of a conversion circuit (17) arranged to supply voltages v.sub.e1 and v.sub.e2 varying linearly as a function of v.sub.e and symmetrically with respect to kU/2 and applied respectively to the inputs of two further analog switches (26, 27) whose outputs are connected to another terminal in the resistor network. The input and output signals of the inverter (9) of the bistable circuit are used to control the switches.
REFERENCES:
patent: 3835419 (1974-09-01), Milne et al.
patent: 4323862 (1982-04-01), Boudault et al.
501 Telecommunications Radioelectriques et Telephoniques
Briody Thomas A.
Grimm Siegfried H.
Streeter William J.
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