Electronic parts for high frequency power amplifier and...

Details Electronic parts for high frequency power amplifier and... Electronic parts for high frequency power amplifier and...

2006-09-21

2010-06-15

Vo, Nguyen (Department: 2618)

Telecommunications

Transmitter

With feedback of modulated output signal

C455S127200

Reexamination Certificate

active

07738845

ABSTRACT:
The present invention provides electronic parts for amplifying high frequency power capable of expanding a dynamic range of an output power detection circuit, obtaining a continuous detection output having no inflexion point from a low region of output power to its high region and thereby improving controllability of the output power. In a wireless communication system which controls output power of a high frequency power amplifier, based on an output power detection signal and a signal indicative of an output level, an output power detection circuit is provided with a multi-stage configured amplifier which amplifies a high frequency signal taken out via a coupler and capacitive elements. Further, a plurality of detection circuits which detect outputs of amplifiers of respective stages, and a detection circuit which detects the high frequency signal without passing through the multi-stage configured amplifier are provided. One obtained by combining the outputs of these detection circuits is inputted to an error amplifier for generating an output power control signal, as the output power detection signal to thereby generate a control signal for the high frequency power amplifier.

REFERENCES:
patent: 5852770 (1998-12-01), Kasamatsu
patent: 6526266 (2003-02-01), Obara et al.
patent: 6625429 (2003-09-01), Yamashita et al.
patent: 2004/0162039 (2004-08-01), Marque-Pucheu
patent: 2005/0287966 (2005-12-01), Yoshimi et al.
patent: 11-177444 (1999-07-01), None
patent: 2001-16116 (2001-01-01), None

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