Transmitter

Details Transmitter Transmitter

2006-10-03

2006-10-03

Moe, Aung (Department: 2618)

Telecommunications

Transmitter

C455S127100

Reexamination Certificate

active

07116946

ABSTRACT:
The present invention provides a transmitter conforming to the EER method in a wide frequency band at high efficiency. For this purpose, the amplitude component of a modulated signal is input to the power supply terminal of a high-frequency power amplifier130, the I and Q quadrature signals thereof are input to the high-frequency input terminal of the high-frequency power amplifier130, and the original modulated signal is obtained from the output of the high-frequency power amplifier130. A collector voltage is supplied from DC—DC converter group615having output voltages being different sequentially to an emitter follower729via a switch group621. One of the outputs of the DC—DC converters616to620is selected depending on the level of the amplitude component as the collector voltage and supplied to the emitter follower, whereby the difference between the emitter voltage of he emitter follower729and the collector voltage of the emitter follower729is made smaller and the efficiency of the emitter follower729is raised; furthermore, the power supply voltage of the high-frequency power amplifier130is voltage-converted by the emitter follower729, whereby operation in a wide frequency band is made possible.

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PCT International Search Report dated Feb. 17, 2004.

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