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A 105.5 dB, 0.49 mm2 Audio ΣΔ Modulator using Chopper Stabilization and Fully Randomized DWA
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- Authors
- Yi-Gyeong Kim, Min-Hyung Cho, Kwi-Dong Kim, Jong-Kee Kwon, Jong Dae Kim
- Issue Date
- 2008-09
- Citation
- Custom Integrated Circuits Conference (CICC) 2008, pp.503-506
- Language
- English
- Type
- Conference Paper
- Abstract
- An audio ZA modulator achieves 105.5 dB dynamic range over 20 kHz audio bandwidth. A chopper stabilization technique is used in both the first integrator and the reference buffer to prevent degradation of the dynamic range and the peak signal-to-noise-plusdistortion-ratio due to flicker noise. A fully randomized data weighted averaging is used as a dynamic element matching technique to suppress the generation of spurious tones with a negligible increase in the in-band noise compared to conventional data weighted averaging. The chip was fabricated in 0.13 μm CMOS technology (I/O devices) and occupies a small chip area of 0.49 mm2. The total power consumption is 9.9 mW from a 3.3 V supply. ©2008 IEEE.