Wanyeong Jung

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Capacitance sensors are widely used to measure various physical quantities, including position, pressure, and concentration of certain chemicals [1-6]. Integrating capacitive sensors into a small wireless sensor system is challenging due to their large power consumption relative to the total system power/energy budget, which can be as low as a few nW [4].(More)
An incremental zoom-in capacitance-to-digital converter (CDC) is proposed. By using a 9b SAR, the OSR can be reduced to only 32, significantly improving conversion energy. We show how the OTA in the SAR is bypassed for the CDC further reducing energy and propose a novel matrix based 512-element unit-cap structure for dynamic element matching. The CDC(More)
—This paper presents a fully integrated energy harvester that maintains 35% end-to-end efficiency when harvesting from a 0.84 mm solar cell in low light condition of 260 lux, converting 7 nW input power from 250 mV to 4 V. Newly proposed self-oscillating switched-capacitor (SC) DC-DC voltage doublers are cascaded to form a complete harvester, with(More)
— Miniaturized biomedical sensors promise improved quality of medical diagnosis and treatment. However, the realization of such implantable devices faces challenges due to limited battery capacity and energy sources. This paper describes new circuit techniques for miniaturized biomedical sensors, with particular emphasis on bio-signals sensing front end,(More)
We present an 8-bit sub-ranging SAR ADC designed for bursty signals having long time periods with small code spread. A modified capacitive-DAC (CDAC) saves previous sample's MSB voltage and reuses it throughout subsequent conversions. This prevents unnecessary switching of large MSB capacitors as well as conversion cycles, reducing energy consumed in the(More)
—Recently, miniaturized sensor nodes have been widely studied for various applications. The advances in these studies have greatly reduced energy consumption, leading to a mm 3-scale system and optimized circuit performance well suited for sensor node applications. This paper focuses on the ultra-low power circuit techniques on the major building blocks and(More)
— This work presents a dual-slope capacitance to digital converter for pressure sensing. The design uses base capacitance subtraction with a configurable capacitor bank and dual precision comparators to improve energy efficiency, consuming 110nW with 9.7b ENOB and 0.85pJ/conv·step FoM. The converter is integrated with a pressure transducer, battery,(More)
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