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A 0.8 V Supply- and Temperature-Insensitive Capacitance-to-Digital Converter in 0.18-Mum CMOS

Title
A 0.8 V Supply- and Temperature-Insensitive Capacitance-to-Digital Converter in 0.18-Mum CMOS
Authors
George, AK[George, Arup K.]Lee, J[Lee, Junghyup]Kong, ZH[Kong, Zhi Hui]Je, M[Je, Minkyu]
DGIST Authors
George, AK[George, Arup K.]; Lee, J[Lee, Junghyup]
Issue Date
2016-07-01
Citation
IEEE Sensors Journal, 16(13), 5354-5364
Type
Article
Article Type
Article
Keywords
CapacitanceCapacitance-to-Digital ConverterCapacitive SensorCapacitive SensorsCmos Integrated CircuitsDigital ConvertersFrequency ConvertersLow-PowerLow-VoltageLow PowerLow VoltagesMEMSOscillators (Electronic)Relaxation OscillatorRelaxation OscillatorsSensor InterfaceTemperatureTemperature-InsensitiveTemperature DependentTemperature DistributionTemperature Variation
ISSN
1530-437X
Abstract
A low-voltage, low-power, capacitance-to-digital converter (CDC) that is insensitive to supply and temperature variations is presented in this paper. The CDC comprises two matched RC oscillators and a counter-based programmable digital converter. The transfer function of the proposed CDC is a scaled ratio of the capacitors having equal drift coefficients, making it insensitive to supply as well as temperature variations. Worst case temperature-dependent drift of ±153.4 ppm/°C is measured between -40 and +120 °C while worst case supply-dependent drift of ±1.12% is measured between 0.8 and 1.2 V over full-scale capacitance range. The proposed CDC achieves 2.05 fF resolution, consuming 23 μA from a 0.8 V supply, at a full-scale range of 3.36 pF. The CDC, realized in 0.18-μm CMOS process, has an active area of 0.102 mm2 and offers a scalable resolution within a range of 2-13 b. © 2016 IEEE.
URI
http://hdl.handle.net/20.500.11750/2242
DOI
10.1109/JSEN.2016.2559164
Publisher
Institute of Electrical and Electronics Engineers Inc.
Files:
There are no files associated with this item.
Collection:
Information and Communication EngineeringIntegrated Nano-Systems Lab1. Journal Articles


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