A 20 W/Channel Class-D Amplifier With Near-Zero Common-Mode Radiated Emissions

Siniscalchi, P.P.; Hester, R.K.

doi:10.1109/jssc.2009.2032724

Cited by 24 publications

(36 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The buffer to drive the power switch is implemented with crosscoupled inverter string. This type of power switch helps to minimize the power consumption and electromagnetic interference emission by preventing the common-mode variation [9]. As shown in Fig.…”

Section: Power Switchmentioning

confidence: 99%

“…7, the power switch has an H-bridge architecture with three levels ("+1," "0," and "-1"), where the "0" level is realized by shortcircuiting the differential output and sharing charge with a common-mode holding capacitor [8]. This type of power switch helps to minimize the power consumption and electromagnetic interference emission by preventing the common-mode variation [9].…”

Section: Power Switchmentioning

confidence: 99%

See 1 more Smart Citation

A Class-D Amplifier for a Digital Hearing Aid with 0.015% Total Harmonic Distortion Plus Noise

Lee¹

2013

ETRI J

View full text Add to dashboard Cite

A class‐D audio amplifier for a digital hearing aid is described. The class‐D amplifier operates with a pulsecode modulated (PCM) digital input and consists of an interpolation filter, a digital sigma‐delta modulator (SDM), and an analog SDM, along with an H‐bridge power switch. The noise of the power switch is suppressed by feeding it back to the input of the analog SDM. The interpolation filter removes the unwanted image tones of the PCM input, improving the linearity and power efficiency. The class‐D amplifier is implemented in a 0.13‐μm CMOS process. The maximum output power delivered to the receiver (speaker) is 1.19 mW. The measured total harmonic distortion plus noise is 0.015%, and the dynamic range is 86.0 dB. The class‐D amplifier consumes 304 μW from a 1.2‐V power supply.

show abstract

Section: Power Switchmentioning

confidence: 99%

Section: Power Switchmentioning

confidence: 99%

A Class-D Amplifier for a Digital Hearing Aid with 0.015% Total Harmonic Distortion Plus Noise

Lee¹

2013

ETRI J

View full text Add to dashboard Cite

show abstract

“…Among these building blocks, the audio amplifier has to drive a resistive output load with very good linearity and therefore tends to consume large power. To perform the audio signal amplification with minimum power consumption, a class-D amplifier has been widely adopted [4,5,6,7,8,9,10,11,12,13,14].…”

Section: Introductionmentioning

confidence: 99%

An analog sigma-delta modulator with shared operational amplifier for low-power class-D audio amplifier

Noh

Lee

Yoo

2015

IEICE Electron. Express

View full text Add to dashboard Cite

To minimize the power consumption of an analog sigma-delta modulator (SDM), a fifth-order loop filter of the SDM has been realized with only three operational amplifiers (op-amp). The analog SDM with shared opamp is applied to a class-D amplifier for a digital hearing aid. The class-D amplifier with the analog SDM has been realized in a standard 0.13-µm CMOS process. The maximum output power level of the class-D amplifier is 1.13-mW for a load with 46.5-Ω DC resistance. The total harmonic distortion+noise (THD+N) and the dynamic range (DR) of the class-D amplifier are 0.0038-% and 96-dB, respectively. The fifth-order analog SDM with shared op-amp consumes only 0.2-mW from a 1.2-V power supply.

show abstract

“…Thus ideally class-D output stages have no dissipation and their power efficiency is 100%. For this reason, class-D amplifiers have gained popularity and are widely adopted for audio power amplification, both for high-power [8]- [14] and low-power [15]- [23] applications.…”

Section: Switching Class-d Amplifiersmentioning

confidence: 99%

“…The integration of complex signal processing functions and features on the same chip as the power blocks necessitates the power stage design in deepsubmicron process nodes. However, the supply bouncing magnitude of several volts, while not yet a problem in [8]- [14], makes the design in these smaller process nodes prone to performance degradation or even malfunction.…”

Section: Introductionmentioning

confidence: 99%

High-voltage class-D power amplifiers

Ma¹

View full text Add to dashboard Cite

Nowadays transducers are ubiquitous as interfaces between the increasingly digital world and the real physical world. The same holds for the power amplifiers driving them. This thesis focuses on the design and optimization of high-voltage class-D amplifiers, which are used for driving capacitive piezoelectric actuator loads in active vibration/noise control applications.The main objective is to further enhance class-D power efficiency compared to existing class-D designs.To gain insight in class D power efficiency, a detailed analysis of high-voltage class-D dissipation sources is performed and a dissipation model including all the major dissipation sources is developed. The analysis shows that switching loss is a potential dominating dissipation source in high-voltage applications, while its contribution can be minimized by fast switching to eliminate V-I overlap losses. Moreover, it is shown that when varying the class-D switching frequency, a minimum total dissipation exists, with the optimal switching frequency depending on the output power. Furthermore, idle loss reduction by increasing the switching frequency and inserting a dead time to the power stage is backed by the analysis.Following the analysis, a fast-switching power stage is designed to aim for switching loss minimization. This output stage design features immunity to the on-chip supply bounce, realized by internally regulated floating supplies, variable driving strength for the gate driver, and an efficient 2-step level shifter design. Fast switching transitions and low switching loss are achieved with 94% peak efficiency for the complete class-D power stage in the realized chip. In addition, gate driver sizing procedures for the class-D output stage are discussed, showing that the variable gate driving strength can greatly improve efficiency when on-chip supply bounce is the limiting factor.Also based on the dissipation analysis, this thesis describes the design of an efficiencyimproved high-voltage class-D power amplifier. The amplifier adaptively regulates its

show abstract

A 20 W/Channel Class-D Amplifier With Near-Zero Common-Mode Radiated Emissions

Cited by 24 publications

References 5 publications

A Class-D Amplifier for a Digital Hearing Aid with 0.015% Total Harmonic Distortion Plus Noise

A Class-D Amplifier for a Digital Hearing Aid with 0.015% Total Harmonic Distortion Plus Noise

An analog sigma-delta modulator with shared operational amplifier for low-power class-D audio amplifier

High-voltage class-D power amplifiers

Contact Info

Product

Resources

About