Integrated stereo Delta-Sigma class D amplifier

Gaalaas, Eric; Liu, B.Y.; Nishimura, Naoaki

doi:10.1109/isscc.2005.1493898

Cited by 54 publications

(51 citation statements)

References 3 publications

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“…Alternative approaches are using a mixed voltage/current feedback to reduce distortion [11] and using a linear amplifier and a switching amplifier in a masterslave configuration [12]. The mixed voltage/current feedback configuration is shown in Recently, Pulse Density Modulated (PDM) class-D amplifiers based on analog  modulators with high-pass noise-shaping characteristics have been introduced as an alternative scheme for controlling the switching power stage [13]- [16]. PDM based class-D amplifiers, as shown in Figure 1.14, can eliminate harmonic distortion caused by the nonlinearity of the carrier and have the characteristic of shaped quantization noise, achieving a lower total harmonic distortion (THD) performance.…”

Section: State Of Artsmentioning

confidence: 99%

“…PDM based class-D amplifiers, as shown in Figure 1.14, can eliminate harmonic distortion caused by the nonlinearity of the carrier and have the characteristic of shaped quantization noise, achieving a lower total harmonic distortion (THD) performance. PDM modulation also minimizes EMI because it spreads out the spectral energy of the output signal over a wide range of frequencies [13], [17]. A PDM-based class-D amplifier is closely related to this thesis.…”

Section: State Of Artsmentioning

confidence: 99%

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A 280 mW, 0.07% THD+N class-D audio amplifier using a frequency-domain quantizer

Lee

Copani

Mayhugh

et al. 2011

Analog Integr Circ Sig Process

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Section: State Of Artsmentioning

confidence: 99%

Section: State Of Artsmentioning

confidence: 99%

A 280 mW, 0.07% THD+N class-D audio amplifier using a frequency-domain quantizer

Lee

Copani

Mayhugh

et al. 2011

Analog Integr Circ Sig Process

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“…Class-D amplifier using a pulse-density modulation (PDM) switching scheme [6] has reported good performance with 0.004% THD+N, 1W output power and 103dB DR. However, PDM switching has one drawback in comparison with PWM.…”

Section: Introductionmentioning

confidence: 99%

Design of a Class-D Audio Amplifier With Analog Volume Control for Mobile Applications

Khadiri¹,

Qjidaa²

2016

International Journal of Electronics and Telecommunications

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Abstract-A class-D audio amplifier with analog volume control (AVC) for portable applications is proposed in this paper. The proposed class-D consist of two sections. First section is an analog volume control which consists of an integrator, an analog MUX and a programmable gain amplifier (PGA). The AVC is implemented with three analog inputs (Audio, Voice, FM). Second section is a driver which consists of a ramp generator, a comparator, a level shifter and a gate driver. The driver is designed to obtain a low distortion and a high efficiency. Designed with 0.18 um 1P6M CMOS technology, the class-D audio amplifier with AVC achieves a total root-mean-square (RMS) output power of 0.5W, a total harmonic distortion plus noise (THD+N) at the 8-Ω load less than 0.06% and a power efficiency of 90% with a total area of 1.74 mm2.

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“…Even if feedback is used, audio quality is limited: Total Harmonic Distortion (THD) is typically 0.1% and Power Supply Rejection Ratio (PSRR) is inferior to 60dB. The research community focuses now to the efficient error correction by feedback control systems [7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Several approaches have been described to design the control block. Some solutions are used: control based on Sigma Delta Modulator [7], Controlled Oscillated Modulator (COM) architecture [8], PWM feedback [9][10], digital feedback [11,12], bang-bang control [13,14], and sliding mode [15]. However, these techniques provide a low PSRR at high frequencies of audio band or they have a high power consumption, superior to 1mA.…”

Section: Introductionmentioning

confidence: 99%