Amplifiers – With semiconductor amplifying device – Including field effect transistor
Reexamination Certificate
2007-07-03
2007-07-03
Shingleton, Michael B (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including field effect transistor
C330S278000, C330S284000, C330S144000, C327S574000
Reexamination Certificate
active
10880553
ABSTRACT:
A first FET is inserted in a series position between a signal input terminal and a signal output terminal, while second and third FETs are inserted in a shunt position respectively between the signal input terminal and a ground terminal and between the signal output terminal and a ground terminal. First and second reference voltage terminals and a control terminal are provided. A first reference voltage and a control voltage are applied to the first FET, while a second reference voltage and a control voltage are applied respectively to the second and third FETs, so that the first, second, and third FETs serve as variable resistors. As such, a gain control circuit is constructed. Further, a first resistor is provided in parallel to the first FET, while second and third resistors are provided respectively in series to the second and third FETs.
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Inamori Masahiko
Motoyoshi Kaname
Nakayama Masao
Takagi Tsunehiro
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