Opamp Gain Insensitive MASH Sigma Delta Modulator for Wide Bandwidth Applications

doi:10.1007/s10470-006-7158-1

淡江大學機構典藏 > 工學院 > 電機工程學系暨研究所 > 期刊論文 > Item 987654321/127320

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題名:	Opamp Gain Insensitive MASH Sigma Delta Modulator for Wide Bandwidth Applications
作者:	Chiang, Jen-shiun;Chen, Hsin-liang
關鍵詞:	Gain-insensitive;Low-distortion;Sigma-delta modulator;Switched-capacitor circuit;Wide bandwidth
日期:	2006-04-06
上傳時間:	2025-04-28 12:05:30 (UTC+8)
摘要:	This work presents a means to enhance the immunity of non-ideal opamp gain effect of the fourth order multi-stage noise shaped (MASH) sigma-delta modulator (SDM) for wide bandwidth applications. The first stage of the SDM is a low-distortion single-loop second order SDM, while the second stage is a low-distortion interpolative second order SDM with Chebyshev type II filter technique. Theoretically, the conventional MASH SDM is impacted by the nonlinear finite gain of the operational amplifier. This impact may have two main phenomena. First, it leaks the incompletely corrected quantization error to the output. Secondly, the nonlinearity causes the harmonic distortion of the input signal. The proposed architecture can reduce the distortion and the sensitivity of the nonlinear finite opamp gain to improve the performance by using low-distortion technique in the MASH SDM. Furthermore, the lower power budget and simplified digital cancellation logic can be achieved. The experimental results indicate that the dynamic range (DR) can reach 87dB with power dissipation of 65 mW. A test SDM chip for Asymmetric Digital Subscriber Line (ADSL) application is designed and implemented by TSMC 0.25 um 1P5M process.
關聯:	Analog Integrated Circuits and Signal Processing 47(3),　p.281-291
DOI:	10.1007/s10470-006-7158-1
顯示於類別:	[電機工程學系暨研究所] 期刊論文

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