Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent
1982-12-23
1985-02-05
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
330263, H03F 330
Patent
active
044980574
ABSTRACT:
A power amplifier with power supply switching is arranged so that large positive and negative power supply voltages are supplied to collectors of second and fourth transistors via first and third transistors, respectively. Small positive and negative power supply voltages are supplied to collectors of the second and fourth transistors, respectively, and an input signal of the amplifier is amplified by the second and fourth transistors to supply an output of the amplifier to a load, wherein to a base of the first transistor is selectively applied either a divided voltage between a positive constant voltage greater than the small positive power supply voltage and the voltage of the input signal or a voltage which is a sum of the voltage of the input signal and a positive constant voltage. To the base of the third transistor is selectively applied either a divided voltage between a negative constant voltage greater than the small negative power supply voltage and the voltage of the input signal or a voltage which is a sum of the voltage of the input signal and a negative constant voltage. Such selections of application for the bases of the first and third transistors are made in response to a magnitude of the frequency of said input signal.
REFERENCES:
patent: 4329657 (1982-05-01), Kamiya
Mullins James B.
Nippon Gakki Seizo Kabushiki Kaisha
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