Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent
1996-10-30
1998-11-10
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
330273, H03F 320
Patent
active
058349774
ABSTRACT:
An amplifying circuit according to the present invention has an amplifying unit for amplifying an input signal to produce an amplified signal, a battery for generating a constant voltage (a first voltage), a step-up converter for always generating an increased voltage (or a second voltage) by increasing the constant voltage, and a selection changing circuit for supplying the increased voltage to the amplifying unit as an electric source voltage when a level of the amplified signal is higher than the constant voltage and supplying the constant voltage to the amplifying unit as the electric source voltage when a level of the amplified signal is lower than the constant voltage. Therefore, because the electric source voltage supplied to the amplifying unit is changed according to the level of the amplified signal, a loss occurring in an electric power consumed in the amplifying unit can be reduced. Also, because the increased voltage is always generated by the step-up converter as compared with a prior art in which any increased voltage is not always generated, even though the increased signal is a high frequency signal, the electric source voltage can reliably change with the level of the amplified signal, so that any distortion of the amplified signal can be prevented.
REFERENCES:
patent: 4433307 (1984-02-01), Yokoyama
patent: 4598255 (1986-07-01), Hong
patent: 5450037 (1995-09-01), Kanaya et al.
Maehara Eiju
Sugimoto Satoshi
Mullins James B.
Sanyo Electric Co,. Ltd.
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