Amplifiers – With semiconductor amplifying device – Including gain control means
Reexamination Certificate
2008-06-03
2009-11-10
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including gain control means
C330S302000, C330S296000
Reexamination Certificate
active
07616060
ABSTRACT:
An amplifying transistor for amplifying a radio frequency signal between an input terminal and an output terminal. The cathode of a first diode is connected to the input terminal and the anode of a second diode is connected to the output terminal. A matching and attenuating circuit is connected between the anode of the first diode and the cathode of the second diode. A matching and attenuating circuit reduces impedance mismatches on the input terminal side and the output terminal side, and attenuates the radio frequency signal. In an amplification mode, a bias circuit supplies a bias current to an amplifying transistor and a current mirror circuit turns off the first and second diodes. In an attenuation mode, the bias circuit supplies no bias current to the amplifying transistor and the current mirror circuit turns on the first and second diodes.
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Miyashita Miyo
Yamamoto Kazuya
Leydig , Voit & Mayer, Ltd.
Mitsubishi Electric Corporation
Nguyen Patricia
LandOfFree
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