Power amplifier

Details Power amplifier Power amplifier

1981-08-05

1984-09-11

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330273, 330298, H03F 326

Patent

active

044713223

ABSTRACT:
A power amplifier is disclosed which reliably amplifies an input signal and decreases power consumption. A pre-driving circuit pre-drives a driving circuit of a power amplifying circuit in response to an input signal. The driving circuit drives an output circuit in the power amplifying circuit. A detecting circuit detects the level of the output of the driving circuit. The pre-driving circuit receives the output of the detecting circuit and supplies the pre-driving circuit with a pre-driving current varying in response to the output of the detecting circuit. Consequently, the pre-driving current can be designed to change in response to demand, i.e., the pre-driving current can be low when demand is low and increase as the occasion demands.

REFERENCES:
patent: 3891933 (1975-06-01), Suzuki et al.
patent: 3914703 (1975-10-01), Stauffer
patent: 4316149 (1982-02-01), Yamaguchi
patent: 4330755 (1982-05-01), Yamaguchi et al.
patent: 4355341 (1982-10-01), Kaplan
"Monolithic Operational Amplifier Design with Improved HF Behavior" by Johan H. Huijsing and Frans Tol, IEE Journal of Solid-State Circuits, vol. SC-11, No. 2, (Apr. 1976).

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