Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Reexamination Certificate
2005-03-29
2005-03-29
Choe, Henry (Department: 2817)
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
C330S136000
Reexamination Certificate
active
06873208
ABSTRACT:
A high-frequency amplifying unit2in which a steep gain variation developed according to a change in the amplitude of input high-frequency signal is suppressed is provided. It amplifies an input high-frequency signal with a plurality of transistors12-1to12-N at the same time a measuring circuit27measures amplitude of the input high-frequency signal, and a bias control circuit26continuously controls a bias applied to each transistors12-1to12-N according to the value of amplitude measured by the measuring circuit27. Thus it is possible to suppress a steep gain variation produced according to a variation in the amplitude of input high-frequency signal.
REFERENCES:
patent: 5196807 (1993-03-01), Fujisawa
patent: 5410275 (1995-04-01), Black
patent: 5757229 (1998-05-01), Mitzlaff
patent: 5923215 (1999-07-01), Hans
patent: 6445247 (2002-09-01), Walker
patent: 56-80906 (1981-07-01), None
patent: 58-178612 (1983-10-01), None
patent: 1167191985 (1985-08-01), None
patent: 62-274906 (1987-11-01), None
patent: 2-149108 (1990-06-01), None
patent: 5-308232 (1993-11-01), None
patent: 9-107299 (1997-04-01), None
patent: 09-270650 (1997-10-01), None
patent: 2000-59157 (2000-02-01), None
patent: 13963 (1982-12-01), None
patent: 1998-067988 (1998-12-01), None
Tetsuo Sato et al.: “Intelligent RF power module using automatic bias control (ABC) system for PCS CDMA applications” IEEE MTT-S. Microwave Symp. Dig., pp. 201-204,1998.
Ikeda Yukio
Joba Hiroyuki
Mori Kazutomi
Motizuki Mitsuru
Nagano Hiroaki
Choe Henry
Mitsubishi Denki & Kabushiki Kaisha
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