High-voltage class-D direct-drive audio amplifier for electrostatic loudspeakers

Electrostatic loudspeakers (ESLs) are capable of low distortion and have desirably flat frequency response within the audio frequency range. In this paper, a novel approach is proposed for audio amplification using a high-voltage direct-digital solid-state class-D amplifier as a method that replaces...

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Main Authors: Kota, J., Holman, D., Wilson, K., Matas, E., Madanayake, A., Elbuluk, M.
Format: Conference Proceeding
Language:English
Subjects:
Logic gates
Loudspeakers
MOSFET circuits
Optical switches
Pulse width modulation
Stators
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Holman, D.
Wilson, K.
Matas, E.
Madanayake, A.
Elbuluk, M.
description Electrostatic loudspeakers (ESLs) are capable of low distortion and have desirably flat frequency response within the audio frequency range. In this paper, a novel approach is proposed for audio amplification using a high-voltage direct-digital solid-state class-D amplifier as a method that replaces impedance matching ESL audio transformers. Optical coupling is used to achieve isolation from the high-voltage side. The proposed stacked MOSFET output stage provides a solution to the voltage swing limitations of the available switching power MOSFETs. An example digital amplifier having 14-bit ADC precision PWM with f c = 50 kHz was implemented at ± 375 V delivering 7W into R a =20kΩ. The digital modulator was realized on a Xilinx Virtex4 Sx35-10ff668 at F s = 100 MHz clock.
doi_str_mv 10.1109/MWSCAS.2012.6292085
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source IEEE Electronic Library (IEL) Conference Proceedings
subjects Logic gates
Loudspeakers
MOSFET circuits
Optical switches
Pulse width modulation
Stators
title High-voltage class-D direct-drive audio amplifier for electrostatic loudspeakers
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