DocumentCode :
33181
Title :
A Sub-Microwatt Asynchronous Level-Crossing ADC for Biomedical Applications
Author :
Yongjia Li ; Duan Zhao ; Serdijn, Wouter A.
Author_Institution :
Biomed. Electron. Group, Delft Univ. of Technol., Delft, Netherlands
Volume :
7
Issue :
2
fYear :
2013
fDate :
Apr-13
Firstpage :
149
Lastpage :
157
Abstract :
A continuous-time level-crossing analog-to-digital converter (LC-ADC) for biomedical applications is presented. When compared to uniform-sampling (US) ADCs LC-ADCs generate fewer samples for various sparse biomedical signals. Lower power consumption and reduced design complexity with respect to conventional LC-ADCs are achieved due to: 1) replacing the n-bit digital-to-analog converter (DAC) with a 1-bit DAC; 2) splitting the level-crossing detections; and 3) fixing the comparison window. Designed and implemented in 0.18 μm CMOS technology, the proposed ADC uses a chip area of 220 × 203 μm2. Operating from a supply voltage of 0.8 V, the ADC consumes 313-582 nW from 5 Hz to 5 kHz and achieves an ENOB up to 7.9 bits.
Keywords :
CMOS integrated circuits; analogue-digital conversion; biomedical electronics; biomedical equipment; digital-analogue conversion; medical signal detection; signal sampling; 1-bit DAC; CMOS technology; ENOB; LC-ADC; biomedical applications; continuous-time level-crossing analog-digital converter; frequency 5 Hz to 5 kHz; level-crossing detections; n-bit digital-analog converter; power 313 nW to 582 nW; power consumption; signal sampling; size 0.18 mum; sparse biomedical signals; sub-microwatt asynchronous level-crossing ADC; voltage 0.8 V; Capacitors; Clocks; Power demand; Quantization (signal); Signal resolution; Signal to noise ratio; Time-frequency analysis; 1-bit digital-to-analog converter (DAC); Analog-to-digital conversion (ADC); asynchronous ADC; biomedical recording; level-crossing ADC; level-crossing sampling; Analog-Digital Conversion; Biomedical Engineering; Electric Power Supplies; Electrocardiography; Electroencephalography; Electromyography; Electronics, Medical; Equipment Design; Humans; Signal Processing, Computer-Assisted; Signal-To-Noise Ratio;
fLanguage :
English
Journal_Title :
Biomedical Circuits and Systems, IEEE Transactions on
Publisher :
ieee
ISSN :
1932-4545
Type :
jour
DOI :
10.1109/TBCAS.2013.2254484
Filename :
6507350
Link To Document :
بازگشت