Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-09-19
2006-09-19
Choe, Henry (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S069000
Reexamination Certificate
active
07109793
ABSTRACT:
In order to enhance a reverse isolation characteristic of a differential amplifier, which is used as, for example, an RE amplifier or a local amplifier of a mobile telephone, differential amplifier is provided which includes a differential amplification circuit for amplifying a difference in potential between two input signals in reverse phase with each other, which are inputted into Port1and Port2, and for outputting two output signals in reverse phase with each other from Port3and Port4; a feedback capacitor connected between Port and Port4; and a feedback capacitor connected between Port2and Port3. Signals for canceling feedback signals are inputted into input terminals via the feedback capacitors, whereby it is possible to the reverse isolation characteristic of the differential amplifier.
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Adachi Hisashi
Nakatani Toshifumi
Choe Henry
Matsushita Electric - Industrial Co., Ltd.
Wenderoth , Lind & Ponack, L.L.P.
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