Phase modulator apparatus for generating a burst...

H - Electricity – 03 – C

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H03C 3/00 (2006.01) H04J 3/10 (2006.01)

Patent

CA 1287130

ABSTRACT OF THE DISCLOSURE A phase modulator apparatus for use in a burst signal communication system such as time division multiple access is described. The apparatus includes a carrier generator for generating a carrier wave, a phase modulator for phase-modulating the carrier wave with an input information signal and an amplifier for amplifying the output of the phase modulator. A power source commonly supplies a source voltage to the carrier generator, the phase modulator and the amplifier. A first switch which is responsive to a burst control signal for controlling the supply of the source voltage to the amplifier is also provided. A second switch is connected in series to a level coupled to the power source and this second switch is responsive to the burst control signal for operating in a manner mutually complementary to the first switch. The invention eliminates frequency variations of the oscillator, caused by fluctuations in power source voltage during burst mode operation.

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