Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1987-03-10
1989-02-07
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330268, H03F 330
Patent
active
048034410
ABSTRACT:
An amplifying circuit comprises a voltage-current converter for voltage-current converting an input signal to be amplified and a current-current converter including a first transistor (NPN), a second transistor (NPN), a third transistor (PNP) and a fourth transistor (PNP). Emitters of the first and third transistors are connected to each other, collector and base of the second transistor are connected to each other, collector and base of the fourth transistor are connected to each other, emitters of the second and fourth transistors are connected to each other, bases of the first and second transistors are connected to each other and bases of the third and fourth transistors are connected to each other. Output current of the voltage-current converter is supplied to the emitters of the first and third transistors and a constant current is supplied to the second and fourth transistors. The amplifying circuit further comprises an output circuit which synthesizes and outputs collector currents of the first and third transistors after amplifying these collector currents and a circuit for negative-feeding back an output of the output circuit to the voltage-current converter. An amplifying circuit with reduced idling current and an expended range of class-A operation is provided.
REFERENCES:
patent: 4404528 (1983-09-01), Yamaguchi
Mullins James B.
Yamaha Corporation
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