Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1977-10-11
1979-01-16
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, 330267, H03F 345
Patent
active
041351622
ABSTRACT:
A power amplifier circuit having a differential amplifier at an input stage and a following complementary symmetry circuit which is driven by a pair of opposite phase output signals of the differential amplifier as a push-pull circuit. One of the pair output signals is directly applied to a transistor of the complementary symmetry circuit and the other is applied to the other transistor of the complementary symmetry circuit through a phase-inverting transistor which forms a current mirror circuit together with a diode or a transistor being connected in the collector circuit of the transistor of the differential amplifier corresponding to the other output signal. So that the pair of opposite phase output signals are applied to two transistors of the complemeary symmetry circuit after being converted into in-phase signals. Because small current flows through the phase-inverting transistor similarly as transistors of the differential amplifier, a transistor of a small power capacity is used as the phase-inverting transistor. The power amplifier circuit is low in the cost, and the distortion, and is not affected by the ambient temperature variation and power source voltage variation.
REFERENCES:
patent: 3995229 (1976-11-01), Stehlin
patent: 4021746 (1977-05-01), Suzuki
Mullins James B.
Sansui Electric Co. Ltd.
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