&amp;#x0394;&amp;#x03A3;AD modulator for low power application

Konagaya, Hajime; Lin, Haijun; San, Hao; Kobayashi, Haruo; Ando, Kazumasa; Yoshida, Hiroshi; Murayama, Chieto; Y, Nisida

doi:10.1109/apccas.2008.4746249

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…We propose here an improved architecture of a noisecoupled ΔΣAD modulator with shared OP-Amp (11) . It extends the OP-Amp sharing technique for feedforward ΔΣAD modulator (12) to the noise-coupled ΔΣAD modulator architecture.…”

Section: Proposed Noise-coupled δσAd Modulator With Shared Op-ampmentioning

confidence: 99%

Noise-Coupled .DELTA..SIGMA.AD Modulator with Shared OP-Amp

et al. 2009

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This paper proposes an improved architecture of the noise-coupled ΔΣAD modulator with OP-Amp sharing technique. The noise-coupled ΔΣAD modulator enhances the order of noise-shaping efficiently by adding some passive capacitors and switches. However, in a conventional noise-coupled ΔΣAD modulator with feedforward path, an analog adder is needed before the quantizer, and especially in a multibit modulator, an additional amplifier is necessary to realize the summation of feedforward signals and coupled quantization noise, which leads to extra chip area and power dissipation. In this paper, we propose a novel architecture of the noise-coupled ΔΣAD modulator with OP-Amp sharing technique, which realizes the summation of feedforward signals and coupled quantization noise without an additional amplifier. The proposed architecture is functionally equivalent to the conventional noise-coupled modulator with smaller chip area and low power dissipation. We have performed simulation with MATLAB and SPICE to verify the effectiveness of the proposed architecture and modulator circuits. The simulation results show that the proposed modulator can realize the noise-shaping enhancement effectually as the same as the conventional noise-coupled modulator with small overhead.

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Section: Proposed Noise-coupled δσAd Modulator With Shared Op-ampmentioning

confidence: 99%

Noise-Coupled .DELTA..SIGMA.AD Modulator with Shared OP-Amp

et al. 2009

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A high-performance, low-power σ Δ ADC for digital audio applications

et al. 2010

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A high-performance low-power † analog-to-digital converter (ADC) for digital audio applications is described. It consists of a 2-1 cascaded † modulator and a decimation filter. Various design optimizations are implemented in the system design, circuit implementation and layout design, including a high-overload-level coefficientoptimized modulator architecture, a power-efficient class A/AB operational transconductance amplifier, as well as a multi-stage decimation filter conserving area and power consumption. The ADC is implemented in the SMIC 0.18-m CMOS mixed-signal process. The experimental chip achieves a peak signal-to-noise-plus-distortion ratio of 90 dB and a dynamic range of 94 dB over 22.05-kHz audio band and occupies 2.1 mm 2 , which dissipates only 2.1 mA quiescent current in the analog circuits.

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A 1.44-mW 96-dB SNR Sigma-Delta modulator with low-power OPAMP

Wang

Zhang

et al. 2011

2011 Academic International Symposium on Optoelectronics and Microelectronics Technology

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ΔΣAD modulator for low power application

Cited by 4 publications

References 9 publications

Noise-Coupled .DELTA..SIGMA.AD Modulator with Shared OP-Amp

Noise-Coupled .DELTA..SIGMA.AD Modulator with Shared OP-Amp

A high-performance, low-power σ Δ ADC for digital audio applications

A 1.44-mW 96-dB SNR Sigma-Delta modulator with low-power OPAMP

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