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A $4^{th}$-Order 1-bit Continuous-Time Sigma-Delta Modulator for Acoustic Sensor  

Kim, Hyoung-Joong (Dep. of Electronic, Electrical, Control and Instrumentation Engineering, Hanyang Univ.)
Lee, Min-Woo (Dep. of Electronic, Electrical, Control and Instrumentation Engineering, Hanyang Univ.)
Roh, Jeong-Jin (Dep. of Electronic, Electrical, Control and Instrumentation Engineering, Hanyang Univ.)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.46, no.3, 2009 , pp. 51-59 More about this Journal
Abstract
This paper presents the design of continuous-time sigma-delta modulator for acoustic sensor. The feedforward structure without summing block is used to reduce power consumption of sigma-delta modulator. A high-linearity active-RC filter is used to improve resolution of sigma-delta modulator. Excess loop delay problem in conventional continuous-time sigma-delta modulators is solved by our proposed architecture. A low power, high resolution fourth-order continuous-time sigma-delta modulator with 1-bit quantization was realized in a 0.13-${\mu}m$ 1-Poly 8-metal CMOS technology, with a core area of $0.58\;mm^2$. Simulation results show that the modulator achieves 91.3-dB SNR over a 25-kHz signal bandwidth with an oversampling ratio of 64, while dissipating $290{\mu}W$ from a 3.3-V supply.
Keywords
Acoustic sensor; continuous-time; sigma-delta modulator; high resolution; low power;
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