Power amplifier with bootstrap voltage clamp

Amplifiers – Bootstrap coupling

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330298, H03F 152

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059458771

ABSTRACT:
An amplifier output stage having an output transistor connected to a high supply voltage and a bootstrap terminal coupled to a control terminal of the output transistor through control circuitry. The output stage includes a capacitor arranged between the bootstrap terminal and the output terminal of the output stage for elevating the voltage at the bootstrap terminal above the high supply voltage, and circuitry for limiting the voltage at the bootstrap terminal to a predetermined threshold. The circuitry for limiting the voltage at the bootstrap terminal directly acts on the control terminal of the output transistor to reduce the conductivity of the output transistor when the voltage at the bootstrap terminal exceeds the predetermined threshold.

REFERENCES:
patent: 3819952 (1974-06-01), Enomoto et al.
patent: 4268796 (1981-05-01), Palara
patent: 4751473 (1988-06-01), Ono
patent: 5315263 (1994-05-01), Mudra et al.
patent: 5526214 (1996-06-01), Takata et al.
French Search Report from French Patent Application No. 96 01766, filed Feb. 8, 1996.
IEEE Transactions on Consumer Electronics, vol. 38, No. 3, Aug. 1, 1992, pp. 217-222, Brasca G., et a., "A 100V/100W Monolithic Power Audio Amplifier in Mixed Bipolar-MOS Technology".

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