Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1987-03-02
1989-04-11
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330149, H03F 132, H03F 345
Patent
active
048209970
ABSTRACT:
A differential amplifier circuit including not only first and second transistors whose emitters are coupled together through a resistor to form a differential transistor pair, but also first and second distortion-correcting transistors, is disclosed. In this circuit, the base terminal of the first transistor is connected to the emitter terminal of the first distortion-correcting transistor, the base terminal of the second transistor is connected to the emitter terminal of the second distortion-correcting transistor, the emitter terminals of the first and second distortion-correcting transistors are connected to a current source of the current control type, and a ratio of the current flowing through the first distortion-correcting transistor to the current flowing through the second distortion-correcting transistor is made equal to a ratio of the emitter current of the second transistor to the emitter current of the first transistor, to cancel the non-linear distortion due to the base-to-emitter voltages of the first and second transistors by the non-linear distortion due to the base-to-emitter voltages of the first and second distortion-correcting transistors, thereby eliminating non-linear distortion from the output of the differential amplifier circuit.
REFERENCES:
patent: 3678404 (1972-07-01), Blom et al.
patent: 3689752 (1972-09-01), Gilbert
patent: 4081758 (1978-03-01), Steckler
patent: 4390848 (1983-06-01), Blauschild
Kawai Masahide
Osawa Michitaka
Sano Yuji
Hitachi , Ltd.
Mullins James B.
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