Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Reexamination Certificate
2007-10-30
2007-10-30
Nguyen, Khanh Van (Department: 2817)
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
C330S279000, C330S285000
Reexamination Certificate
active
10836197
ABSTRACT:
The present invention provides a communication semiconductor integrated circuit device equipped with a high-frequency power amplifier circuit including a gain control amplifier and a bias circuit which supplies such a bias current as to linearly change the gain of the gain control amplifier, and a wireless communication system using the same. A bias current generating circuit which supplies a bias current to a linear amplifier that constitutes the communication high-frequency power amplifier circuit, comprises a plurality of variable current sources respectively different in current value and start level. These variable current sources are controlled according to an input control voltage and thereby combine their currents into a bias current. The combined bias current changes exponentially with respect to the input control voltage.
REFERENCES:
patent: 6049252 (2000-04-01), Iwata
patent: 6175279 (2001-01-01), Ciccarelli et al.
patent: 6278325 (2001-08-01), Juang
patent: 6847807 (2005-01-01), Fujiki
Hikasa Kazuhiko
Hori Kazuaki
Toyota Kenji
Nguyen Khanh Van
Renesas Technology Corp.
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