Iranian Conference on Electrical Engineering (ICEE) , 2016-05-10

Title : ( A 0.7-V 400-μW 16-bit audio sigma-delta modulator with a modified tracking quantizer )

Authors: Mehdi Saberi , majid yaghoobi , Reza Lotfi ,

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Abstract

In this paper a low-power audio ΣΔ modulator under 0.7 V supply is proposed. The proposed structure uses a second order modulator with cascade integrator feedback (CIFB) and half-delayed input-feedforward architectures. In order to avoid the extremely scaling the loop filter coefficients in the CIFB ΣΔ modulator with tracking quantizer, the proposed modulator employs a novel difference-tracking multi-bit quantizer. Since the maximum step size of the proposed quantizer output signal is considered 3VLSB, compared with the conventional counterpart, a larger noise transfer function (NTF) gain can be allowed leading to a considerable reduction in the complexity and power consumption of the modulator. Simulation results of the proposed modulator in a 0.18-μm CMOS technology confirm that an SNDR of 97.9 dB is achieved for a 20-kHz signal bandwidth at the cost of 400 μW power consumption when the supply voltage is only 0.7 V.

Keywords

, Sigma-delta modulation, low voltage, low power, difference-tracking quantizer
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@inproceedings{paperid:1060493,
author = {Saberi, Mehdi and Yaghoobi, Majid and Lotfi, Reza},
title = {A 0.7-V 400-μW 16-bit audio sigma-delta modulator with a modified tracking quantizer},
booktitle = {Iranian Conference on Electrical Engineering (ICEE)},
year = {2016},
location = {شیراز, IRAN},
keywords = {Sigma-delta modulation; low voltage; low power; difference-tracking quantizer},
}

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%0 Conference Proceedings
%T A 0.7-V 400-μW 16-bit audio sigma-delta modulator with a modified tracking quantizer
%A Saberi, Mehdi
%A Yaghoobi, Majid
%A Lotfi, Reza
%J Iranian Conference on Electrical Engineering (ICEE)
%D 2016

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