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Search Results (3)

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Keywords = readout ICs (ROICs)

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12 pages, 10567 KiB  
Article
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
by Chanyoung Son, Seok-Tae Koh and Hyuntak Jeon
Micromachines 2025, 16(4), 398; https://doi.org/10.3390/mi16040398 - 29 Mar 2025
Viewed by 450
Abstract
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 [...] Read more.
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 mm2, 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. Full article
(This article belongs to the Special Issue Micro/Nano Sensors: Fabrication and Applications)
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11 pages, 4763 KiB  
Article
High Accuracy Open-Type Current Sensor with a Differential Planar Hall Resistive Sensor
by Sungho Lee, Sungmin Hong, Wonki Park, Wonhyo Kim, Jaehoon Lee, Kwangho Shin, Cheol-Gi Kim and Daesung Lee
Sensors 2018, 18(7), 2231; https://doi.org/10.3390/s18072231 - 12 Jul 2018
Cited by 16 | Viewed by 6199
Abstract
In this paper, we propose a high accuracy open-type current sensor with a differential Planar Hall Resistive (PHR) sensor. Conventional open-type current sensors with magnetic sensors are usually vulnerable to interference from an external magnetic field. To reduce the effect of an unintended [...] Read more.
In this paper, we propose a high accuracy open-type current sensor with a differential Planar Hall Resistive (PHR) sensor. Conventional open-type current sensors with magnetic sensors are usually vulnerable to interference from an external magnetic field. To reduce the effect of an unintended magnetic field, the proposed design uses a differential structure with PHR. The differential structure provides robust performance to unwanted magnetic flux and increased magnetic sensitivity. In addition, instead of conventional Hall sensors with a magnetic concentrator, a newly developed PHR with high sensitivity is employed to sense horizontal magnetic fields. The PHR sensor and read-out integrated circuit (IC) are integrated through a post-Complementary metal-oxide-semiconductor (CMOS) process using multi-chip packaging. The current sensor is designed to measure a 1 A current level. The measured performance of the designed current sensor has a 16 kHz bandwidth and a current nonlinearity of under ±0.5%. Full article
(This article belongs to the Section Physical Sensors)
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10 pages, 11117 KiB  
Article
Transparent Fingerprint Sensor System for Large Flat Panel Display
by Wonkuk Seo, Jae-Eun Pi, Sung Haeung Cho, Seung-Youl Kang, Seong-Deok Ahn, Chi-Sun Hwang, Ho-Sik Jeon, Jong-Uk Kim and Myunghee Lee
Sensors 2018, 18(1), 293; https://doi.org/10.3390/s18010293 - 19 Jan 2018
Cited by 19 | Viewed by 9818
Abstract
In this paper, we introduce a transparent fingerprint sensing system using a thin film transistor (TFT) sensor panel, based on a self-capacitive sensing scheme. An armorphousindium gallium zinc oxide (a-IGZO) TFT sensor array and associated custom Read-Out IC (ROIC) are implemented for the [...] Read more.
In this paper, we introduce a transparent fingerprint sensing system using a thin film transistor (TFT) sensor panel, based on a self-capacitive sensing scheme. An armorphousindium gallium zinc oxide (a-IGZO) TFT sensor array and associated custom Read-Out IC (ROIC) are implemented for the system. The sensor panel has a 200 × 200 pixel array and each pixel size is as small as 50 μm × 50 μm. The ROIC uses only eight analog front-end (AFE) amplifier stages along with a successive approximation analog-to-digital converter (SAR ADC). To get the fingerprint image data from the sensor array, the ROIC senses a capacitance, which is formed by a cover glass material between a human finger and an electrode of each pixel of the sensor array. Three methods are reviewed for estimating the self-capacitance. The measurement result demonstrates that the transparent fingerprint sensor system has an ability to differentiate a human finger’s ridges and valleys through the fingerprint sensor array. Full article
(This article belongs to the Section Physical Sensors)
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