Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1988-02-19
1989-10-10
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330134, 330136, H03G 318
Patent
active
048734934
ABSTRACT:
An audio amplifier whose operating point and supply voltage can be change in response to a level of an input signal. The audio amplifier includes a delay circuit for delaying an input signal, an amplifier circuit having an amplification device for amplifying an output signal of the delay circuit, the amplifier circuit having a variable operating point, a power supply circuit capable of changing a supply voltage to the amplifier circuit, and a control circuit for detecting a level of the input signal to output a control signal corresponding to the detecting level, and changing the operating point and supply voltage of the amplifier circuit, in response to a level change of the input signal.
REFERENCES:
patent: 3720880 (1971-10-01), Le Seigneur
patent: 4498057 (1982-12-01), Noro
A. M. Saleh et al, "Improving the power-added efficiency of FET amplifiers operating with varying-envelope signals", IEEE transactions on microwave theory and techniques, vol. MTT-31, No. 1, Jan. 1983, pp. 51-56, IEEE, New York.
Mullins James B.
Victor Company of Japan Ltd.
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