Title :
A 105.5 dB, 0.49 mm2 Audio ΣΔ modulator using chopper stabilization and fully randomized DWA
Author :
Kim, Yi-Gyeong ; Cho, Min-Hyung ; Kim, Kwi-Dong ; Kwon, Jong-Kee ; Kim, Jongdae
Author_Institution :
Electron. & Telecommun. Res. Inst., Daejeon
Abstract :
An audio S.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-plus-distortion-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 mum 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.
Keywords :
CMOS integrated circuits; buffer circuits; flicker noise; integrating circuits; reference circuits; sigma-delta modulation; CMOS technology; audio modulators; chopper stabilization; data weighted averaging; dynamic element matching; dynamic range; flicker noise; power 9.9 mW; reference buffer; sigma-delta modulators; size 0.13 mum; voltage 3.3 V; 1f noise; CMOS technology; Choppers; Circuits; Degradation; Dynamic range; Energy consumption; Filters; Noise generators; Signal processing;
Conference_Titel :
Custom Integrated Circuits Conference, 2008. CICC 2008. IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-2018-6
Electronic_ISBN :
978-1-4244-2019-3
DOI :
10.1109/CICC.2008.4672132
