DocumentCode :
1964001
Title :
An 18µW 79dB-DR 20KHz-BW MASH ΔΣ modulator utilizing self-biased amplifiers for biomedical applications
Author :
Wang, Le ; Theogarajan, Luke
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of California, Santa Barbara, CA, USA
fYear :
2011
fDate :
19-21 Sept. 2011
Firstpage :
1
Lastpage :
4
Abstract :
This paper presents a micro power, area-efficient 4th-order MASH delta-sigma modulator based on a novel self-biased amplifiers for neural sensing applications. A high-gain self-biased CMOS amplifier is proposed to achieve low power operation. Floating correlated double sampling technique is devised to enhance the amplifer´s gain-linearity and hence the modulator´s SFDR and SNDR performance. Fabricated in a 0.13 μm CMOS process, the prototype achieves 71 dB peak SNDR and 79 dB peak DR over 20 KHz neural signal bandwidth, while occupying only 0.06 mm2 silicon area. By optimizing the power budgets for different amplifiers, the MASH modulator consumes only 18 μW from 1.5 V supply. The proposed circuit techniques can be applied to other operational transconductance amplifier-based circuits for low power, high speed, and area-efficient design.
Keywords :
CMOS integrated circuits; biomedical equipment; delta-sigma modulation; low-power electronics; operational amplifiers; MASH ΔΣ modulator; MASH delta sigma modulator; MASH modulator; SFDR performance; SNDR performance; biomedical applications; floating correlated double sampling; frequency 20 kHz; high gain self biased CMOS amplifier; low power operation; micro power; neural sensing applications; neural signal bandwidth; operational transconductance amplifier circuits; power 18 muW; self biased amplifiers; size 0.13 mum; CMOS integrated circuits; Inverters; Mathematical model; Modulation; Multi-stage noise shaping; Noise; Prototypes;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2011 IEEE
Conference_Location :
San Jose, CA
ISSN :
0886-5930
Print_ISBN :
978-1-4577-0222-8
Type :
conf
DOI :
10.1109/CICC.2011.6055286
Filename :
6055286
Link To Document :
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