H - Electricity – 03 – F
Patent
H - Electricity
03
F
330/16
H03F 3/26 (2006.01) H03F 3/30 (2006.01)
Patent
CA 1090433
AUDIO-FREQUENCY POWER AMPLIFIERS ABSTRACT OF THE DISCLOSURE An audio- or low-frequency power amplifier comprises a pair of output transistors which are opposite in a conduction type to each other and con- nected in a complementary push-pull circuit configura- tion in which an impedance element is connected between the bases of the paired output transistors whose bases are adapted to be applied with an input signal while the output signal of the amplifier is derived from the coupled emitters of the output transistors. The amplifier further includes a current stabilizer tran- sistor having a base-emitter junction across which a fixed bias voltage is applied and a collector, the current from which is supplied to the impedance element thereby to provide a bias voltage for the paired output transistors. A first resistor is connected between the emitter of the current stabilizer transistor and one electrode or pole of a first d.c. power source while a second resistor is connected between the emitter of the current stabilizer tran- sistor and the other pole of the d.c. source, thereby to maintain constant the bias voltages applied to the paired output transistors.
274244
Amada Nobutaka
Maeda Akinori
Sampei Tohru
Gowling Lafleur Henderson Llp
Hitachi Ltd.
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