Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent
1982-05-04
1984-10-09
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
330265, 330267, H03F 330
Patent
active
044764448
ABSTRACT:
A power amplifier circuit comprises a class A amplifier having a pair of output amplifying devices responsive to an input for driving a load, a power supply connected between power supply terminals of the output amplifying devices for producing a voltage, and a class B power amplifier driven by the input to the class A amplifier. The class B power amplifier includes a pair of push-pull output amplifying devices having outputs connected respectively to the power supply terminals, and a pair of drivers for driving the push-pull output amplifying devices. The drivers have first controlled electrodes for driving the push-pull output amplifying devices and second controlled electrodes connected to a common potential point. A negative feedback loop may be connected for supplying signals dependent upon voltage changes at the power supply terminals back to an input stage of the class B power amplifier.
REFERENCES:
patent: 4217556 (1980-08-01), Ito et al.
Garde, "Schemes for Increased Output-Voltage Swing From Operational Amplifiers," Electronics Letters, vol. 13, No. 4, pp. 111-112, Feb. 17, 1977.
Tanaka, "New Biasing Circuit for Class B Operation," J. Audio Eng. Soc., vol. 29, No. 3, Mar. 1981, pp. 148-152.
Mullins James B.
Pioneer Electronic Corporation
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