High frequency power amplification electric part and...

Amplifiers – With semiconductor amplifying device – Including gain control means

Reexamination Certificate

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C330S129000, C330S279000

Reexamination Certificate

active

11231819

ABSTRACT:
The present invention provides a high frequency amplifier suitable for use in a wireless communication system which performs detection of an output level necessary for feedback control by a current detection system, wherein control sensitivity in an area low in transmit request level is lowered so that an output level can be controlled over the whole control range with satisfactory accuracy. There is provided a high frequency power amplification electric part constituting a wireless communication system, which performs detection of an output level necessary for feedback control of output power by a current detection system, compares the output level detected signal and an output level designation signal and generates a bias voltage for a high frequency power amplifier according to the difference therebetween to thereby control gain, wherein an nth root converter or a logarithm converter is provided between a current detector and a current-voltage converter.

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patent: 2000-151310 (2000-05-01), None
“Basis of Microwave and Its Application”, Sogo Electrics Press, Jun. 10, 1995, pp. 185-198.
“Electronic Material”, Institute for Industrial Research, Apr. 1999, pp. 91-95.

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