AM signal transmitter

Details AM signal transmitter AM signal transmitter

1986-01-06

1988-02-02

Ng, Jin F.

Telecommunications

Transmitter

Amplitude modulation

455127, 375 22, H04B 104

Patent

active

047233087

ABSTRACT:
An AM signal transmitter for generating an amplitude modulated carrier comprises a voltage-increasing stage and a power-increasing stage. The voltage-increasing stage includes a pulse width modulator, responsive to an input modulation signal, for producing a pair of high frequency pulse trains which are modulated in width in a complementary fashion. The pair of pulse trains are respectfully fed to a pair of switching and amplifying elements arranged in push-pull fashion. The output of the switching and amplifying elements is processed through a low pass filter to eliminate high frequency components, and is stepped up in voltage by processing through a voltage step-up transformer. The output of the voltage step-up transformer is then fed to the power stage of the AM signal transmitter, which include a power amplifier. Both the power amplifier and the switching and amplifying elements can be powered from a single power source. Other embodiments of the invention can be realized.

REFERENCES:
patent: 3413570 (1968-11-01), Bruene et al.
patent: 4063199 (1977-12-01), Oursler, Jr.
patent: 4122415 (1978-10-01), Luther, Jr. et al.
patent: 4186346 (1980-01-01), Wysocki
patent: 4250469 (1981-02-01), Cooper et al.
patent: 4272737 (1981-06-01), Molyneux-Berry
patent: 4336615 (1982-06-01), Abt et al.

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