Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2005-08-23
2005-08-23
Choe, Henry (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S252000
Reexamination Certificate
active
06933783
ABSTRACT:
An FET is connected between the emitters of first and second transistors. The emitter of the first transistor is connected to a ground terminal through a plurality of resistors and the emitter of the second transistor is connected to the ground terminal through a plurality of resistors. Another FET is connected between a node between the plurality of resistors on one side and a node between the plurality of resistors on the other side. The gates of the FETs are connected to a control terminal receiving a control voltage through resistors respectively. The resistors and the FETs form a variable resistance circuit. Alternatively, two FETs are serially connected between nodes connected to the emitters of the first and second transistors. Another FET is connected between a node between the two FETs and a ground terminal. The gates of the two FETs are connected to a control terminal receiving a control voltage through resistors respectively. The gate of the other FET is connected to a control terminal receiving a control voltage through a resistor. The control voltages change complementarily to each other. The FETs form a variable resistance circuit.
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Choe Henry
McDermott Will & Emery LLP
Sanyo Electric Co,. Ltd.
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