Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent
1999-03-23
2000-08-22
Gensler, Paul
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
330146, H03F 304
Patent
active
061078867
ABSTRACT:
A power amplifier comprises a pair of power-supply rails, a power-supply voltage divider, an intermediate power-supply line, a first and second BTL amplifiers, and a first to fourth switching circuits. The power-supply rails are composed of a first power-supply line to which a power-supply potential is applied and a second power-supply line to which the ground potential is applied. The power-supply divider produces an intermediate potential by dividing the voltage between the power-supply rails in two and supplies it to the intermediate power-supply line. The first BTL amplifier is provided between the second power-supply line and the intermediate power-supply line. The second BTL amplifier is provided between the first power-supply line and the intermediate power-supply line. The first and second BTL amplifiers each include an output bridge circuit. At small signal input, the switching circuit connects not only the output bridge circuit of the first BTL amplifier between the intermediate power-supply line and second power-supply line, but also the output bridge circuit of the second BTL amplifier between the first power-supply line and the intermediate power-supply line. At large signal input, the switching circuit connects each of the output bridge circuits of the first and second BTL amplifiers between the power-supply rails.
REFERENCES:
patent: 5479134 (1995-12-01), Kokubo et al.
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patent: 5708390 (1998-01-01), Dunnebacke
patent: 5973555 (1999-10-01), Kokubo et al.
B. Murari, et al. "Smart Power ICs: Technologies and Applications", New York, Springer, 1955, pp. 416-423.
Philips Semiconductors, "40W Car Radio High Power Amplifier TDA1560Q", Data Sheet, May 14, 1996, pp. 1-12.
Kusakabe Hiromi
Tsurumi Hiroyuki
Gensler Paul
Kabushiki Kaisha Toshiba
Nguyen Khanh Van
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