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/√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.
Original language | English |
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Article number | 493 |
Journal | Sensors (Switzerland) |
Volume | 20 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2020 Jan 2 |
Bibliographical note
Funding Information:This work was funded by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2015M3A7B7045470).
All Science Journal Classification (ASJC) codes
- Analytical Chemistry
- Biochemistry
- Atomic and Molecular Physics, and Optics
- Instrumentation
- Electrical and Electronic Engineering