Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1984-06-28
1986-08-12
LaRoche, Eugene R.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
307106, 332 9T, 363 26, 375 22, H03K 700
Patent
active
046059105
ABSTRACT:
The present invention relates to a circuit for producing a switching modulating signal for switching a pulse duration modulator, so that the pulse duration modulator produces an output signal which is independent of the supply voltage. The circuit is comprised of an amplifier having at least one input port and an output port. The input port is connected to a modulating signal via a first resistor. A multiplier is provided which has first and second input ports and an output port. The first port of the multiplier is connected to the supply voltage, the second input port is connected to the output port of the amplifier, and the output port of the multiplier is connected via a second resistor to at least one input port of the amplifier. The switching modulating signal appears at the output port of the amplifier. This switching modulating signal, when used to switch a pulse duration modulator, provides a signal at the output of the modulator which is independent of the supply voltage.
REFERENCES:
patent: 3866146 (1975-02-01), Van Mourik
LaRoche Eugene R.
Lee James C.
Nautical Electronic Laboratories Limited
Tantallon Halifax Co.
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