Current Measurement Transducer Based on Current-to-Voltage-to-Frequency Converting Ring Oscillator with Cascade Bias Circuit.
Sensors (Basel)
; 20(2)2020 Jan 15.
Article
em En
| MEDLINE
| ID: mdl-31952300
ABSTRACT
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/âHz, 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.
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MEDLINE
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En
Ano de publicação:
2020
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Article