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A 15-nW per Sensor Interference-Immune Readout IC for Capacitive Touch Sensors
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

This paper presents a readout IC that uses an asynchronous capacitance-to-digital-converter (CDC) to digitize the capacitance of a touch sensor. A power-efficient tracking algorithm ensures that the CDC consumes negligible power consumption in the absence of touch events. To...

A 0.4-V 0.93-nW/kHz Relaxation Oscillator Exploiting Comparator Temperature-Dependent Delay to Achieve 94-ppm/°C Stability
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

This paper presents the analysis and design of a relaxation oscillator that counteracts the complementary-to-absolute-temperature (CTAT) property of the comparator delay with the proportional-to-absolute-temperature (PTAT) property of the RC core to realize temperature-stabilized operation....

A 5.5 nW battery-powered wireless ion sensing system
2017 Edition, September 1, 2017 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

This paper presents a battery-connected wireless ion sensing system comprising a Na+-selective electrode, a 406 pW Potentiometrie front end, a 780 pW reference-free asynchronous SAR ADC, a 2.4 GHz power oscillator-based transmitter that consumes 2.4...

A Battery-Powered Wireless Ion Sensing System Consuming 5.5 nW of Average Power
2018 Edition, Volume 53, July 1, 2018 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

This paper presents a battery-powered wireless ion sensing platform featuring complete sensing-to-transmission functionality. A 1 mm × 1.2 mm chip fabricated in 65 nm includes a 406 pW potentiometric analog front end, a 780 pW 10-bit SAR ADC,...

A 61-nW Level-Crossing ADC with Adaptive Sampling for Biomedical Applications
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

An ultra-low power level-crossing analog-to-digital converter (LC-ADC) with on-chip adaptive sampling is presented. Different from conventional ADCs based on Nyquist sampling, LC-ADC utilizes sparsity of signals for low power data acquisition. To save power, the proposed adaptive sampling...

A 1.08-nW/kHz 13.2-ppm/°C Self-Biased Timer Using Temperature-Insensitive Resistive Current
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

This paper proposes a 32.7 kHz self-biased wake-up timer using temperature-insensitive resistive current. A dual-loop structure with supply-regulation loop and frequency-locked loop determines the regulated voltages at both ends of a temperature-compensated resistor and...

A 15-nW per Sensor Interference-Immune Readout IC for Capacitive Touch Sensors
2019 Edition, Volume 54, July 1, 2019 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

This paper presents a readout IC that uses an asynchronous capacitance-to-digital-converter (CDC) to digitize the capacitance of a touch sensor. A power-efficient tracking algorithm ensures that the CDC consumes negligible power consumption in the absence of touch events. To...

In-depth electrical characterization of carrier transport in ambipolar Si-NW Schottky-barrier FETs
2017 Edition, September 1, 2017 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

In this paper the operation mechanism of ambipolar Si-nanowire (Si-NW) Schottky-barrier (SB) FETs is discussed in detail using temperature dependent current-voltage (I-V) contour maps. Thermionic and field emission mechanism limited the overall conduction behavior of ambipolar Si-NW SB-FETs with...

Automatic Mode-Selected Energy Harvesting Interface With >80% Power Efficiency Over 200 nW to 10 mW
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

This paper proposes a dual-mode digital buck converter with an automatic mode-select feature in a 0.18-μm CMOS for self-powered Internet-of-Things applications. The proposed converter combines the digital pulsewidth modulation and the proposed predetermined pulse-frequency modulation...

Design of a 0.20-0.25-V, Sub-nW, Rail-to-Rail, 10-bit SAR ADC for Self-Sustainable IoT Applications
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

This paper presents a 10-bit SAR ADC operating at a supply voltage (VDD) from 0.200 to 0.250 V. In the proposed ADC structure, the positive input of the comparator is fixed at VDD to bias the comparator's input transistor pair with a sufficient gate-to-source voltage at such...

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