Transmitter

Details Transmitter Transmitter

2008-07-01

2008-07-01

Vuong, Quochien B (Department: 2618)

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

C455S115300, C375S297000, C375S300000, C330S278000

Reexamination Certificate

active

07395039

ABSTRACT:
In a transmitter of the present invention, a modulated signal is separated into an amplitude component and a phase component which are inputted to a radio-frequency modulated signal input terminal and a supply voltage terminal of a radio-frequency power amplifier. A voltage adjustment circuit is provided between an output terminal of the radio-frequency power amplifier and an amplitude amplification circuit having a feedback circuit. The voltage adjustment circuit changes the amount of isolation in accordance with the voltage level of the amplitude component. By this, the amplitude component of the radio-frequency modulated wave attenuates the level inputted to the feedback circuit of the amplitude amplification circuit through the supply voltage terminal of the radio-frequency power amplifier.

REFERENCES:
patent: 5251330 (1993-10-01), Chiba et al.
patent: 5854971 (1998-12-01), Nagoya et al.
patent: 7116946 (2006-10-01), Tanabe et al.
patent: 7276985 (2007-10-01), Hirano
patent: 7295599 (2007-11-01), Karsi
patent: 2005/0202789 (2005-09-01), Tanabe et al.

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