Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1980-03-27
1982-06-01
Tokar, Michael J.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330297, H03F 326
Patent
active
043330592
ABSTRACT:
A power-amplifying circuit embodying this invention comprises a pre-amplifier for amplifying an input signal, a push-pull amplifier including first and second transistors driven in accordance with an output from the pre-amplifier, and a feedback circuit which detects output currents from the first and second transistors and supplies a current corresponding to a product of output currents from the first and second transistors to the pre-amplifier through a negative feedback path in order to regulate the quiescent currents of the first and second transistors. The push-pull amplifier is driven by a power source having a prescribed level of voltage. The feedback circuit and pre-amplifier are driven by an auxiliary power source whose voltage is obtained by adding through a bootstrap capacitor the output voltage from the push-pull amplifier to a referential voltage slightly lower than the power supply voltage by a resistor.
REFERENCES:
patent: 2789164 (1957-04-01), Stanley
patent: 3904974 (1975-09-01), Fakaya
Huijsing, "Monolithic Operational Amplifier Design with Improved HF Behavior", IEEE Journal of Solid State Circuits, vol. SC-11, No. 2, Apr. 1976, pp. 323-328.
"Transistors Auto Amplifiers", by D. Jones and R. Ghea, 1968, pp. 176 to 178, 190, 191 and 247.
Telefunken Brochure "Semiconductor News for the Industry", 6503 114 of Oct. 1965, pp. 2 and 3.
Ishii Takashi
Yamaguchi Hiroyasu
Tokar Michael J.
Tokyo Shibaura Denki Kabushiki Kaisha
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