Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1997-06-23
1999-03-30
Mottola, Steven J.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330274, H03F 326
Patent
active
058894330
ABSTRACT:
While no signals are being supplied to first and second drive circuits, the drive circuits keep supplying idling currents to the bases of first and second transistors which constitute a push-pull amplifier. A first control circuit is provided in the base-emitter path of the first transistor, to control the first transistor in accordance with an input signal. A second control circuit is provided in the base-emitter path of the second transistor, to control the second transistor in accordance with an input signal. The first control circuit comprises a third transistor, a first resistor connected between the collector and base of the third transistor, a third resistor connected between the collector of the third transistor and the base of the first transistor, a constant current source connected to the base of the third transistor. The second control circuit comprises a fourth transistor, a second resistor connected between the collector and base of the fourth transistor, a fourth resistor connected between the collector of the fourth transistor and the base of the second transistor, a constant current source connected to the base of the fourth transistor.
REFERENCES:
patent: 4025871 (1977-05-01), Peil
patent: 5160897 (1992-11-01), Fujisawa et al.
Kabushiki Kaisha Toshiba
Mottola Steven J.
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