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A Delta-Sigma Modulator for Low-Power Analog Front Ends in Biomedical Instrumentation

Title
A Delta-Sigma Modulator for Low-Power Analog Front Ends in Biomedical Instrumentation
Author
노정진
Keywords
Analog front end (AFE); biomedical instrumentation; delta-sigma modulator (DSM); dual-integrating DSM (DI-DSM); preamplifier; DIGITAL HEARING-AID; CMOS; CHIP
Issue Date
2016-07
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, v. 65, No. 7, Page. 1530-1539
Abstract
This paper presents a high-resolution dual-integrating delta-sigma modulator (DI-DSM) for low-power analog front-end (AFE) circuits in biomedical instrumentation. The AFE contains a preamplifier and a switched-capacitor DS analog-to-digital converter. The proposed DI-DSM adopts two kinds of clock frequencies: one is the same as the conventional frequency and the other is one-half of the conventional frequency, which provides sufficient settling time for critical blocks. The proposed structure reduces harmonic distortions at the output of the preamplifier, since the preamplifier is given sufficient time to charge the sampling capacitor in the DSM. The use of a lower switching frequency at the critical blocks results in a significant reduction in the power consumption of both the preamplifier and the modulator. The proposed AFE chip is fabricated in a 65-nm CMOS process. The measurement results of the modulator show a peak signal-to-noise ratio (SNR) of 81.4 dB and a peak signal-to-noise-plus-distortion ratio (SNDR) of 80.4 dB, with a power consumption of 24.8 mu W at a supply voltage of 1 V and a signal bandwidth of 10 kHz. The complete AFE chip [which includes a preamplifier, a DI-DSM, a low-dropout (LDO) regulator, and a bandgap reference circuit (BGR)] shows a measured peak SNR of 79.3 dB and a measured peak SNDR of 77.0 dB with a preamplifier power of only 46.8 mu W (and 22.3 mu W for LDO, and 36.3 mu W for BGR).
URI
https://ieeexplore.ieee.org/abstract/document/7436785/http://hdl.handle.net/20.500.11754/65833
ISSN
0018-9456; 1557-9662
DOI
10.1109/TIM.2016.2534358
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ELECTRICAL ENGINEERING(전자공학부) > Articles
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