A 0.8-V 816-nW delta-sigma modulator for low-power biomedical applications
- Authors
- Roh, Hyungdong; Lee, Hyuntae; Choi, Youngkil; Roh, Jeongjin
- Issue Date
- Apr-2010
- Publisher
- SPRINGER
- Keywords
- Delta-sigma modulator; Switched-capacitor circuit; Biomedical circuit; Oversampling; Analog-to-digital converter (ADC); Analog circuit design
- Citation
- ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING, v.63, no.1, pp.101 - 106
- Indexed
- SCIE
SCOPUS
- Journal Title
- ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING
- Volume
- 63
- Number
- 1
- Start Page
- 101
- End Page
- 106
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/39907
- DOI
- 10.1007/s10470-009-9390-y
- ISSN
- 0925-1030
- Abstract
- This letter discusses the implementation of a low-voltage, low-power delta-sigma modulator as a sensing stage for biomedical applications. A distributed feed-forward structure and bulk-driven operational transconductance amplifier are used in order to achieve efficient operation at a supply voltage of 0.8 V. Instead of conventional low-voltage amplifier architectures, our design uses folded-cascode amplifiers, although they are not used in most low-voltage circuits. A wide input swing is achieved by using the bulk-driven approach, and the drawback of the limited voltage swing of the cascoded output stage is overcome by the distributed feed-forward modulator. The designed modulator has a dynamic range of 49 dB at a 0.8-V supply voltage and consumes only 816 nW of power for the 250-Hz bandwidth. The core chip size of the modulator is 1000 mu m 9 500 mu m by using the 0.18-mu m standard CMOS process.
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