Class-D audio amplifiers in mobile applications

Berkhout, Marco

doi:10.1109/iscas.2009.5117969

Cited by 39 publications

(42 citation statements)

References 14 publications

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“…The current flows from the battery via inductor to the ground. The inductor current slope is positive as expressed in (1).…”

Section: Proposed Sibo Power Modulementioning

confidence: 99%

“…Class-D amplifiers (CDAs) with high power efficiency, small size and good audio quality play an important role in consumer electronics [1]- [16]. Recently, in order to provide a better experience in all multimedia applications for users, the required output power of CDAs has come to the range of 2W or more in smart phones and tablets applications, not to mention notebooks.…”

Section: Introductionmentioning

confidence: 99%

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Embedded Single-Inductor Bipolar-Output DC–DC Converter in Class-D Amplifier for Low Common Noise

Chen

Lin

et al. 2016

IEEE Trans. Power Electron.

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this paper proposes a high efficiency Class-D amplifier (CDA) with embedded singleinductor bipolar output (SIBO) power module. The characteristics of SIBO converter's bipolar outputs not only suppress equivalent common mode noise but also remove several large external bulky components in conventional boost supply CDA systems. Since bipolar outputs in the SIBO provide independent driving capability, CDA is capable to operate in both single-ended (SE) and bridge-tide load (BTL) configurations. Furthermore, the proposed dynamic voltage boosting (DVB) technique adjusts the SIBO output voltage level according to the CDA's output level with 5% power efficiency improvement. Peak total harmonic distortion plus noise (THD+N) performance is 0.012%. Peak power efficiency of SIBO and CDA are 89% and 93.2%, respectively.

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“…The current flows from the battery via inductor to the ground. The inductor current slope is positive as expressed in (1).…”

Section: Proposed Sibo Power Modulementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Embedded Single-Inductor Bipolar-Output DC–DC Converter in Class-D Amplifier for Low Common Noise

Chen

Lin

et al. 2016

IEEE Trans. Power Electron.

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“…The simplest DPWM, known as uniform sampled PWM (UPWM), is inherently nonlinear and generates more distortion than natural sampling PWM (NPWM). The nonlinearity of the PCM-UPWM conversion may be reduced through increasing the sampling rate of the digital input signal (interpolation), and application of precompensation linearization algorithms, which attempt to emulate NPWM in the best possible way, and to give comparable preformance [1][2][3][4][5][6]. In our design the PCM signal is transformed directly into a DPWM signal using linearized Class-BD double sided (LBDD) algorithm emulating natural sampling Class-BD double sided (NBDD) modulation scheme.…”

Section: Introductionmentioning

confidence: 99%

Hybrid LBDD PWM modulator for digital class-BD audio amplifier based on STM32F407VGT6 microcontroller and analog DLL

Jasielski

Kuta

Kolodziejski

et al. 2015

2015 22nd International Conference Mixed Design of Integrated Circuits &Amp; Systems (MIXDES)

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In the paper a new architecture and implementation of the 9-bit hybrid LBDD PWM modulator for digital Class-BD audio amplifier has been proposed. First, the PCM audio signal is transformed into the requantized to 9-bit resolution DPWM data, using LBDD algorithm. Then the 9-bit DPWM data are converted into the two physical trains of PWM pulses to control the output power transistors, using two hybrid digital to time converters (HDTC). The HDTC converts 6 MSB data on the base counter method using advanced-control timers TIM1 and TIM8 of the STM32F407VGT6 microcontroller, while the remaining 4 LSB data -using a quantizer system based on the tapped voltage controlled delay line (TVCDL) put into the ADLL loop, which have been designed in 180nm CMOS technology from UMC. A basic feasibility study of proposed configuration has been performed.

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“…An emerging domain for this architecture is mobile, where efficiency, reduced heat production, which allows for longer battery life and deeper integration within more complex systems. In this domain, BTL amplifiers can be particularly useful, since they provide four times the output power for the same supply voltage, and sometimes allowing efficient and good quality filter-less designs [1].…”

Section: Introductionmentioning

confidence: 99%

“…Another subsystem then uses this information to temporarily shut down the output stage or limit its current, thus protecting the circuit from damage such as electromigration in interconnects. Previous works [1][2][3] on this subject focus on single-ended (SE) architectures, and known extensions of this system to BTL simply apply two identical SE systems [4].…”

Section: Introductionmentioning

confidence: 99%

Overcurrent detection circuit for integrated class-D amplifiers

Cadete

Guilherme

et al. 2011

2011 20th European Conference on Circuit Theory and Design (ECCTD)

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This paper presents a new architecture for a overcurrent detection system, dedicated to fully integrated class-D audio amplifiers, that uses half the comparators than conventional architectures. A detailed implementation for a 1-W bridge-tied load (BTL) class-D amplifier, on a 0.18 μm CMOS technology is presented, showing a reduction of 28.8% in current consumption and 23.5% in silicon area, when compared to its equivalent conventional architecture.

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Class-D audio amplifiers in mobile applications

Cited by 39 publications

References 14 publications

Embedded Single-Inductor Bipolar-Output DC–DC Converter in Class-D Amplifier for Low Common Noise

Embedded Single-Inductor Bipolar-Output DC–DC Converter in Class-D Amplifier for Low Common Noise

Hybrid LBDD PWM modulator for digital class-BD audio amplifier based on STM32F407VGT6 microcontroller and analog DLL

Overcurrent detection circuit for integrated class-D amplifiers

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