Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1992-11-16
1994-12-06
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, 330260, H03F 345
Patent
active
053714768
ABSTRACT:
In an amplifying circuit of current subtraction type, a first output of a differential amplifier is coupled through a first transistor to an output electrode of an output-side transistor of a current mirror circuit and a second output of the differential amplifier is coupled through a second transistor to an input electrode and an output electrode of an input-side transistor of the current mirror circuit so that an output current based on a difference between the first output and the second output flows out from a connection of the first transistor and the output-side transistor of the current mirror circuit. A first circuit device for phase compensation is inserted between bases of input-side and output-side transistors of one of the first and second transistors, and a second circuit device for compensating a direct current offset generated by the first circuit device is .inserted between bases of input-side and output-side transistors of the other of the first and second transistors.
Mullins James B.
Rohm & Co., Ltd.
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