DocumentCode :
675592
Title :
An ultra-low-power first-order asynchronous sigma-delta modulator for biomedical applications
Author :
Colletta, Gustavo D. ; Dutra, Odilon O. ; Ferreira, Luis H. C. ; Pimenta, Tales C.
Author_Institution :
Syst. Eng. & Inf. Technol. Inst., Fed. Univ. of Itajuba, Itajuba, Brazil
fYear :
2013
fDate :
7-10 Oct. 2013
Firstpage :
1
Lastpage :
2
Abstract :
In this paper an ultra-low-power first-order asynchronous sigma-delta modulator (ASDM) for biomedical applications in weak inversion is presented. It combines a Gm-C integrator as a linear filter in addition to a kind of zero biasing continuous time comparator with hysteresis as a non-linear element. The proposed ASDM was successfully simulated in an 130-nm IBM CMOS process. The simulations show a SINAD of 43.48 dB in a frequency bandwidth of 250 Hz for a modulation depth of 70 % with only 500 mV of power supply voltage and just 7.5 nW of power consumption. The typical figure of merit used to evaluate ADC circuits predicts an energy of 0.11 pJ per conversion step, which is suitable for implantable/wearable biomedical applications.
Keywords :
CMOS integrated circuits; asynchronous circuits; biomedical electronics; comparators (circuits); filters; low-power electronics; sigma-delta modulation; ADC circuits; ASDM; Gm-C integrator; IBM CMOS process; SINAD; bandwidth 250 Hz; figure of merit; implantable-wearable biomedical applications; linear filter; nonlinear element; power 7.5 nW; size 130 nm; ultra-low-power first-order asynchronous sigma-delta modulator; zero biasing continuous time comparator; Bandwidth; Biological system modeling; Frequency modulation; Hysteresis; Power supplies; Sigma-delta modulation;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
SOI-3D-Subthreshold Microelectronics Technology Unified Conference (S3S), 2013 IEEE
Conference_Location :
Monterey, CA
Type :
conf
DOI :
10.1109/S3S.2013.6716564
Filename :
6716564
Link To Document :
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