A Low-Power, Auto-DC-Suppressed Photoplethysmography Readout System with Differential Current Mirrors and Wide Common-Mode Input Range Successive Approximation Register Analog-to-Digital Converter
This paper presents a low-power photoplethysmography (PPG) readout system designed for wearable health monitoring. The system employs a differential current mirror (DCM) to convert single-ended PPG currents into differential voltages, inherently suppressing DC components. A wide common-mode input ra...
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MDPI AG
2025-03-01
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| Online Access: | https://www.mdpi.com/2072-666X/16/4/398 |
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| author | Chanyoung Son Seok-Tae Koh Hyuntak Jeon |
| author_facet | Chanyoung Son Seok-Tae Koh Hyuntak Jeon |
| author_sort | Chanyoung Son |
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| description | This paper presents a low-power photoplethysmography (PPG) readout system designed for wearable health monitoring. The system employs a differential current mirror (DCM) to convert single-ended PPG currents into differential voltages, inherently suppressing DC components. A wide common-mode input range (WCMIR) SAR ADC processes the differential signals, ensuring accurate analog-to-digital conversion. The DCM eliminates the need for DC cancelation loops, simplifying the design and reducing power consumption. Implemented in a 0.18 µm CMOS process, the system occupies only 0.30 mm<sup>2</sup>, making it suitable for multi-channel applications. The system achieves over 60 dB DC dynamic range and consumes only 9.6 µW, demonstrating its efficiency for portable devices. The simulation results validate its ability to process PPG signals across various conditions, offering a scalable solution for advanced biomedical sensing platforms. |
| format | Article |
| id | doaj-art-9b3479f7cd264dcaaeba7d20832fa2e8 |
| institution | OA Journals |
| issn | 2072-666X |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
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| series | Micromachines |
| spelling | doaj-art-9b3479f7cd264dcaaeba7d20832fa2e82025-08-20T02:18:04ZengMDPI AGMicromachines2072-666X2025-03-0116439810.3390/mi16040398A Low-Power, Auto-DC-Suppressed Photoplethysmography Readout System with Differential Current Mirrors and Wide Common-Mode Input Range Successive Approximation Register Analog-to-Digital ConverterChanyoung Son0Seok-Tae Koh1Hyuntak Jeon2School of Semiconductor Engineering, Chungbuk National University (CBNU), Cheongju 28644, Republic of KoreaSchool of Electrical Engineering, Chungbuk National University (CBNU), Cheongju 28644, Republic of KoreaSchool of Semiconductor Engineering, Chungbuk National University (CBNU), Cheongju 28644, Republic of KoreaThis paper presents a low-power photoplethysmography (PPG) readout system designed for wearable health monitoring. The system employs a differential current mirror (DCM) to convert single-ended PPG currents into differential voltages, inherently suppressing DC components. A wide common-mode input range (WCMIR) SAR ADC processes the differential signals, ensuring accurate analog-to-digital conversion. The DCM eliminates the need for DC cancelation loops, simplifying the design and reducing power consumption. Implemented in a 0.18 µm CMOS process, the system occupies only 0.30 mm<sup>2</sup>, making it suitable for multi-channel applications. The system achieves over 60 dB DC dynamic range and consumes only 9.6 µW, demonstrating its efficiency for portable devices. The simulation results validate its ability to process PPG signals across various conditions, offering a scalable solution for advanced biomedical sensing platforms.https://www.mdpi.com/2072-666X/16/4/398PPG (photoplethysmography)readout ICs (ROICs)differential current mirror (DCM)successive approximation register (SAR)analog-to-digital converter (ADC) |
| spellingShingle | Chanyoung Son Seok-Tae Koh Hyuntak Jeon A Low-Power, Auto-DC-Suppressed Photoplethysmography Readout System with Differential Current Mirrors and Wide Common-Mode Input Range Successive Approximation Register Analog-to-Digital Converter Micromachines PPG (photoplethysmography) readout ICs (ROICs) differential current mirror (DCM) successive approximation register (SAR) analog-to-digital converter (ADC) |
| title | A Low-Power, Auto-DC-Suppressed Photoplethysmography Readout System with Differential Current Mirrors and Wide Common-Mode Input Range Successive Approximation Register Analog-to-Digital Converter |
| title_full | A Low-Power, Auto-DC-Suppressed Photoplethysmography Readout System with Differential Current Mirrors and Wide Common-Mode Input Range Successive Approximation Register Analog-to-Digital Converter |
| title_fullStr | A Low-Power, Auto-DC-Suppressed Photoplethysmography Readout System with Differential Current Mirrors and Wide Common-Mode Input Range Successive Approximation Register Analog-to-Digital Converter |
| title_full_unstemmed | A Low-Power, Auto-DC-Suppressed Photoplethysmography Readout System with Differential Current Mirrors and Wide Common-Mode Input Range Successive Approximation Register Analog-to-Digital Converter |
| title_short | A Low-Power, Auto-DC-Suppressed Photoplethysmography Readout System with Differential Current Mirrors and Wide Common-Mode Input Range Successive Approximation Register Analog-to-Digital Converter |
| title_sort | low power auto dc suppressed photoplethysmography readout system with differential current mirrors and wide common mode input range successive approximation register analog to digital converter |
| topic | PPG (photoplethysmography) readout ICs (ROICs) differential current mirror (DCM) successive approximation register (SAR) analog-to-digital converter (ADC) |
| url | https://www.mdpi.com/2072-666X/16/4/398 |
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