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

Conference paper (2016)

Authors

Majid Yaghoubi Ferdowsi University of Mashhad

M Saberi Ferdowsi University of Mashhad

R. Lotfi Bio-Electronics -

Research Group

Bio-Electronics () (TU Delft)

Low power Low voltage Sigma-delta modulation Difference-tracking quantizer

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Published Date

2016

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Bio-Electronics

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.