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Current Measurement Transducer Based on Current-To-Voltage-To-Frequency Converting Ring Oscillator with Cascade Bias Circuit

Department of Electrical & Electronic Engineering, Yonsei University, Seoul 03722, Korea
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Sensors 2020, 20(2), 493; https://doi.org/10.3390/s20020493
Received: 29 November 2019 / Revised: 9 January 2020 / Accepted: 11 January 2020 / Published: 15 January 2020
(This article belongs to the Special Issue Sensor Networks in Distributed Measurement Systems)
We propose a ring oscillator (RO) based current-to-voltage-to-frequency (I–V–F) converting current transducer with a cascade bias circuit. The I–V–F converting scheme guarantees highly stable biasing against RO, with a rail-to-rail output operation. This device was fabricated using National NanoFab Center (NNFC) 180 nm complementary metal-oxide-semiconductor (CMOS) technology, which achieves a current resolution of 1 nA in a measurement range up to 200 nA. A noise floor of 11.8 pA/√Hz, maximum differential nonlinearity (DNL) of 0.15 in 1 nA steps, and rail-to-rail output with a 1.8 V power supply is achieved. The proposed transducer can be effectively applied to bio-sensing devices requiring a compact area and low power consumption with a low current output. The fabricated structure can be applied to monolithic-three-dimensional integration with a bio-sensing device. View Full-Text
Keywords: current-to-frequency (I–F) converting current transducer; current-to-voltage-to-frequency (I–V–F) converting current transducer; ring oscillator (RO); biosensor current-to-frequency (I–F) converting current transducer; current-to-voltage-to-frequency (I–V–F) converting current transducer; ring oscillator (RO); biosensor
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Park, J.; Park, J.-H.; Jung, S.-O. Current Measurement Transducer Based on Current-To-Voltage-To-Frequency Converting Ring Oscillator with Cascade Bias Circuit. Sensors 2020, 20, 493.

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