Filterless, Digital Class-BD Audio Amplifiers with Constant Common Mode Output Voltage

This paper presents new and original architectures and implementations of two filterless, open-loop digital Class-BD audio amplifiers with constant common mode (CM) output voltage. The first, low-power amplifier consists of four ultrahigh-current EL7158 pin drivers, the OUT pins of which form the H...

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Autores principales:	Stanisław Kuta, Witold Machowski, Wojciech Kołodziejski, Łukasz Chlastawa
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	digital Class-D audio amplifier filterless Class-D amplifier linearized pulse width modulation (LPWM) electromagnetic interference (EMI) Technology T
Acceso en línea:	https://doaj.org/article/70466c9749f04d9bbb23c590d05b062e
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id	oai:doaj.org-article:70466c9749f04d9bbb23c590d05b062e
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spelling	oai:doaj.org-article:70466c9749f04d9bbb23c590d05b062e2021-11-11T15:49:58ZFilterless, Digital Class-BD Audio Amplifiers with Constant Common Mode Output Voltage10.3390/en142170141996-1073https://doaj.org/article/70466c9749f04d9bbb23c590d05b062e2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7014https://doaj.org/toc/1996-1073This paper presents new and original architectures and implementations of two filterless, open-loop digital Class-BD audio amplifiers with constant common mode (CM) output voltage. The first, low-power amplifier consists of four ultrahigh-current EL7158 pin drivers, the OUT pins of which form the H bridge. The drivers are controlled from the extended LBDD PWM modulator and have appropriately set voltage levels on the VL and VH pins. The second proposed amplifier consists of two cooperating H-bridge power stages (HBS) implemented on complementary MOSFET pairs and powered by two different voltages. Both HBSs are driven by four EL7158 pin drivers having appropriately adjusted voltage levels on the VL and VH pins and controlled by an extended LBDD PWM modulator. The hybrid 9 bit DPWM modulator uses a linearized Class-BD double-sided modulation scheme with pre-compensation, enabling the most faithful emulation of natural NBDD PWM and, thus, providing attractive spectral characteristics at the DM output. Basic SPICE simulations and experimental results of the proposed digital Class-BD amplifiers were compared with the conventional digital Class-BD amplifiers. The elimination of CM signals significantly contributes to the reduction in electromagnetic interference (EMI), particularly those produced on the cables connecting the loudspeaker to the HBS terminal. Proposed Class-BD amplifiers with original and new topologies, due to their simple design and easy control (no galvanic isolation of control signals and no floating bias power supplies), which generate no CM voltage and feature excellent DM performance, similar to conventional Class-BD amplifiers, are very attractive solutions for filterless Class-BD amplifiers.Stanisław KutaWitold MachowskiWojciech KołodziejskiŁukasz ChlastawaMDPI AGarticledigital Class-D audio amplifierfilterless Class-D amplifierlinearized pulse width modulation (LPWM)electromagnetic interference (EMI)TechnologyTENEnergies, Vol 14, Iss 7014, p 7014 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	digital Class-D audio amplifier filterless Class-D amplifier linearized pulse width modulation (LPWM) electromagnetic interference (EMI) Technology T
spellingShingle	digital Class-D audio amplifier filterless Class-D amplifier linearized pulse width modulation (LPWM) electromagnetic interference (EMI) Technology T Stanisław Kuta Witold Machowski Wojciech Kołodziejski Łukasz Chlastawa Filterless, Digital Class-BD Audio Amplifiers with Constant Common Mode Output Voltage
description	This paper presents new and original architectures and implementations of two filterless, open-loop digital Class-BD audio amplifiers with constant common mode (CM) output voltage. The first, low-power amplifier consists of four ultrahigh-current EL7158 pin drivers, the OUT pins of which form the H bridge. The drivers are controlled from the extended LBDD PWM modulator and have appropriately set voltage levels on the VL and VH pins. The second proposed amplifier consists of two cooperating H-bridge power stages (HBS) implemented on complementary MOSFET pairs and powered by two different voltages. Both HBSs are driven by four EL7158 pin drivers having appropriately adjusted voltage levels on the VL and VH pins and controlled by an extended LBDD PWM modulator. The hybrid 9 bit DPWM modulator uses a linearized Class-BD double-sided modulation scheme with pre-compensation, enabling the most faithful emulation of natural NBDD PWM and, thus, providing attractive spectral characteristics at the DM output. Basic SPICE simulations and experimental results of the proposed digital Class-BD amplifiers were compared with the conventional digital Class-BD amplifiers. The elimination of CM signals significantly contributes to the reduction in electromagnetic interference (EMI), particularly those produced on the cables connecting the loudspeaker to the HBS terminal. Proposed Class-BD amplifiers with original and new topologies, due to their simple design and easy control (no galvanic isolation of control signals and no floating bias power supplies), which generate no CM voltage and feature excellent DM performance, similar to conventional Class-BD amplifiers, are very attractive solutions for filterless Class-BD amplifiers.
format	article
author	Stanisław Kuta Witold Machowski Wojciech Kołodziejski Łukasz Chlastawa
author_facet	Stanisław Kuta Witold Machowski Wojciech Kołodziejski Łukasz Chlastawa
author_sort	Stanisław Kuta
title	Filterless, Digital Class-BD Audio Amplifiers with Constant Common Mode Output Voltage
title_short	Filterless, Digital Class-BD Audio Amplifiers with Constant Common Mode Output Voltage
title_full	Filterless, Digital Class-BD Audio Amplifiers with Constant Common Mode Output Voltage
title_fullStr	Filterless, Digital Class-BD Audio Amplifiers with Constant Common Mode Output Voltage
title_full_unstemmed	Filterless, Digital Class-BD Audio Amplifiers with Constant Common Mode Output Voltage
title_sort	filterless, digital class-bd audio amplifiers with constant common mode output voltage
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/70466c9749f04d9bbb23c590d05b062e
work_keys_str_mv	AT stanisławkuta filterlessdigitalclassbdaudioamplifierswithconstantcommonmodeoutputvoltage AT witoldmachowski filterlessdigitalclassbdaudioamplifierswithconstantcommonmodeoutputvoltage AT wojciechkołodziejski filterlessdigitalclassbdaudioamplifierswithconstantcommonmodeoutputvoltage AT łukaszchlastawa filterlessdigitalclassbdaudioamplifierswithconstantcommonmodeoutputvoltage
_version_	1718433580658458624

Filterless, Digital Class-BD Audio Amplifiers with Constant Common Mode Output Voltage

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