A 0.018% THD+N, 88-dB PSRR PWM Class-D Amplifier for Direct Battery Hookup

Choi, Yu Yong; Tak, Wonho; Yoon, Younghyun; Roh, Jeongjin; Kwon, Sunwoo; Koh, Jinseok

doi:10.1109/jssc.2011.2170770

Cited by 44 publications

(35 citation statements)

References 22 publications

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“…Structure of the delta-sigma ADC Figure 3 shows the architecture of the designed SC delta-sigma ADC, which adopts a 1-bit, third-order, and CIFF structure with the input-feedforward path. A third-order structure usually has fewer stability challenges compared with higher-order modulators [11,20] and also has a better noise-shaping performance [21]. A third-order structure usually has fewer stability challenges compared with higher-order modulators [11,20] and also has a better noise-shaping performance [21].…”

Section: Structure and Circuit Implementationmentioning

confidence: 99%

“…This is because a 1-bit modulator has better linearity [19]. A third-order structure usually has fewer stability challenges compared with higher-order modulators [11,20] and also has a better noise-shaping performance [21]. A CIFF structure with the input-feedforward path leaves the noise only for the processed signal in the loop, which provides the advantage of a significantly small output swing for each integrator output.…”

Section: Structure and Circuit Implementationmentioning

confidence: 99%

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A 7.5‐μW 0.08‐mm² single‐ended SC delta‐sigma ADC for acoustic sensor applications

Duan

Wang

Roh

2015

Circuit Theory & Apps

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This study presents an ultra-low-power, small-size, 1-bit, single-ended, and switched-capacitor (SC) deltasigma analog-to-digital converter (ADC) for wireless acoustic sensor nodes. This wireless sensor node has a delta-sigma ADC that converts the sensed signal to a digital signal for convenient data processing and emphasizes the features of small size and low-power consumption. The chip area of the delta-sigma ADC is dominated by the capacitor; therefore, a novel common-mode (CM) controlling technique with only transistors is proposed. This ADC achieves an extremely small size of 0.08 mm 2 in a 130-nm CMOS process. The conventional operational transconductance amplifiers (OTAs) are replaced by inverters in the weak inversion region to achieve high power efficiency. At 4-MHz sampling frequency and 0.7-V power supply voltage, the delta-sigma ADC achieves a 55.8-dB signal-to-noise-plus-distortion ratio (SNDR) and a 298-fJ/step figure-of-merit (FOM) in a signal bandwidth of 25 kHz, while consuming only 7.5 μW of power.

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Section: Structure and Circuit Implementationmentioning

confidence: 99%

Section: Structure and Circuit Implementationmentioning

confidence: 99%

A 7.5‐μW 0.08‐mm² single‐ended SC delta‐sigma ADC for acoustic sensor applications

Duan

Wang

Roh

2015

Circuit Theory & Apps

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“…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

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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.

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“…Further, to depict the efficacy of the proposed overcurrent protection circuit, a highly power-efficient fullyintegrated Bridged-Tied-Load (BTL) Bang-bang CDA including the protection circuit is designed and realized (using a 130nm CMOS process) for low-voltage power-critical applications. Note that Bang-bang CDA is probably the most power-efficient CDA for micropower applications as its modulator consumes very little power (~10W) [3,[5][6][7] and the Bang-bang CDA in this paper is probably the first-ever fully-integrated filterless BTL Bang-bang CDA in the literature. The ensuing total power dissipation of the prototype CDA is reduced by over 50% (compared to a benchmark design), and this translates to >2x battery life span (at M=0.05).…”

Section: Introductionmentioning

confidence: 99%

An Ultralow-Power Overcurrent Protection Circuit for Micropower Class D Amplifiers

Guo

Chang

2015

IEEE Trans. Circuits Syst. II

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Although Class D Amplifiers (CDAs) are highly advantageous over their linear amplifier counterparts in terms of power-efficiency, their power-efficiency remains undesirably low at nominal operation conditions where the output power is ~26dB lower than its peak output power (due to the large crest factor of the audio/speech signal and headroom for adjustment). This is particularly the case for power-critical micropower applications such as hearing instrument. At the nominal conditions, we find that the overcurrent protection circuit (for output stage) is unexpectedly the most power dissipative block in micropower CDAs. In this paper, we propose a novel ultra-low-power overcurrent protection circuit which features 67% lower power dissipation compared to conventional overcurrent protection circuit without compromising the IC area. To further verify the advantages of the proposed overcurrent protection circuit, an ultra-low power Bang-bang Class D amplifier is designed. We show that by employing the proposed overcurrent protection circuit, the power-efficiency of the Bang-Bang Class D amplifier is significantly improved from 10.5% to 23.7% for a 64 load and from 1.8% to 4.7% for a 400 load. 

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A 0.018% THD+N, 88-dB PSRR PWM Class-D Amplifier for Direct Battery Hookup

Cited by 44 publications

References 22 publications

A 7.5‐μW 0.08‐mm² single‐ended SC delta‐sigma ADC for acoustic sensor applications

A 7.5‐μW 0.08‐mm² single‐ended SC delta‐sigma ADC for acoustic sensor applications

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

An Ultralow-Power Overcurrent Protection Circuit for Micropower Class D Amplifiers

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A 0.018% THD+N, 88-dB PSRR PWM Class-D Amplifier for Direct Battery Hookup

Cited by 44 publications

References 22 publications

A 7.5‐μW 0.08‐mm2 single‐ended SC delta‐sigma ADC for acoustic sensor applications

A 7.5‐μW 0.08‐mm2 single‐ended SC delta‐sigma ADC for acoustic sensor applications

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

An Ultralow-Power Overcurrent Protection Circuit for Micropower Class D Amplifiers

Contact Info

Product

Resources

About

A 7.5‐μW 0.08‐mm² single‐ended SC delta‐sigma ADC for acoustic sensor applications

A 7.5‐μW 0.08‐mm² single‐ended SC delta‐sigma ADC for acoustic sensor applications