Telecommunications – Transmitter
Reexamination Certificate
2007-08-14
2007-08-14
Nguyen, Simon (Department: 2618)
Telecommunications
Transmitter
C455S127300, C330S254000, C330S278000
Reexamination Certificate
active
10896858
ABSTRACT:
The present invention is an amplifier circuit that permits variable gain control, comprising an input terminal to which a high frequency input signal is supplied; an amplifier transistor to the gate of which the high frequency input signal supplied to the input terminal is supplied and which generates an amplified signal at the drain side; and a variable attenuator provided in a signal transmission line between the input terminal and the gate of the amplifier transistor, in which a plurality of attenuation units in which an attenuation capacitor and a switch transistor are serially connected are provided in parallel between the signal transmission line and a power supply, and the attenuation ratio of which is variably controlled by controlling the conduction of the switch transistor.
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Arai Tomoyuki
Enright David
Arent & Fox LLP
Fujitsu Limited
Nguyen Simon
LandOfFree
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