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Wide Input Range Supply Voltage Tolerant Capacitive Sensor Readout Using On-Chip Solar Cell
Suyan Fan1; Man-Kay Law1; Mingzhong Li1; Zhiyuan Chen1; Chio-In Ieong1; Pui-In Mak1,2; Rui P. Martins1,2
2016
Source PublicationJournal of Circuits, Systems and Computers
ISSN0218-1266
Volume25Issue:1
Abstract

In this paper, a wide input range supply voltage tolerant capacitive sensor readout circuit using on-chip solar cell is presented. Based on capacitance controlled oscillators (CCOs) for ultra-low voltage/power consumption, the sensor readout circuit is directly powered by the on-chip solar cell to improve the overall system energy e±ciency. An extended sensing range with high sensing accuracy is achieved using a two-step successive approximation register (SAR) and delta-sigma (δσ ) analog-to-digital (A/D) conversion (ADC) scheme. Digital controls are generated on-chip using a customized sub-threshold digital standard cell library. Systematic error analysis and optimization including the nite switch on-resistance, buer input-dependent delay, and SAR quantization nonlinearity are also outlined. High power supply rejection ratio (PSRR) is ensured by using a pseudo-dierential topology with ratiometric readout. The complete sensing system is implemented using a standard 0.18 μ m complementary metal-oxidesemiconductor (CMOS) process. Simulation results show that the readout circuit achieves a wide input range from 1.5 pF to 6.5 pF with a worst case PSRR of 0.5% from 0.3V to 0.42V (0.67% from 0.3V to 0.6 V). With a 3.5 pF input capacitance and a 0.3V supply, the δσ stage achieves a resolution of 7.1-bit (corresponding to a capacitance of 2.2 fF/LSB) with a conversion frequency of 371 Hz. With an average power consumption of 40nW and a sampling frequency of 47.5 kHz, a gure-of-merit (FoM) of 0.78 pJ/conv-step is achieved.

KeywordOn-chip Solar Cell Capacitive Sensor Readout Ultra-low Voltage Ultra-low Power Two-step Conversion Psrr
DOIhttp://doi.org/10.1142/S0218126616400065
URLView the original
Indexed BySCI
Language英语
WOS Research AreaComputer Science ; Engineering
WOS SubjectComputer Science, Hardware & Architecture ; Engineering, Electrical & Electronic
WOS IDWOS:000365108800007
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Citation statistics
Document TypeJournal article
CollectionINSTITUTE OF MICROELECTRONICS
DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
Corresponding AuthorMan-Kay Law
Affiliation1.State-Key Laboratory of Analog and Mixed-Signal VLSI Department, University of Macau, Taipa, Macau, P. R. China
2.Department of ECE, Faculty of Science and Technology, University of Macau, Taipa, Macau, P. R. China
First Author AffilicationUniversity of Macau
Corresponding Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Suyan Fan,Man-Kay Law,Mingzhong Li,et al. Wide Input Range Supply Voltage Tolerant Capacitive Sensor Readout Using On-Chip Solar Cell[J]. Journal of Circuits, Systems and Computers,2016,25(1).
APA Suyan Fan.,Man-Kay Law.,Mingzhong Li.,Zhiyuan Chen.,Chio-In Ieong.,...&Rui P. Martins.(2016).Wide Input Range Supply Voltage Tolerant Capacitive Sensor Readout Using On-Chip Solar Cell.Journal of Circuits, Systems and Computers,25(1).
MLA Suyan Fan,et al."Wide Input Range Supply Voltage Tolerant Capacitive Sensor Readout Using On-Chip Solar Cell".Journal of Circuits, Systems and Computers 25.1(2016).
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