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[IEEE 2018 International Conference on Electrical Engineering and Computer Science (ICECOS) - PANGKAL PINANG, Indonesia (2018.10.2-2018.10.4)] 2018 International Conference on Electrical Engineering and Computer Science (ICECOS) - Design and Implementation of Analog Transceiver Circuit for Patient Monitoring System based on OWC
摘要： In this paper, we present the design and implementation of analog front-end (AFE) module for patient monitoring system based on optical wireless communication (OWC). The communication link uses visible light as a downlink and IR as an uplink communication. The wireless patient monitoring system consists of two parts: host or coordinator and client or patient device. On the patient device part, we designed the PCB with a shield configuration so the AFE module can be connected directly to GPIO’s microcontroller unit (MCU) without any cable. Moreover, the AFE module is attempted to have a similar size with the MCU. Hence, the patient device has a small-size, minimum of wires, wearable, and low-complexity. The AFE receiver output is a digital waveform. Therefore, it is compatible with On-off Keying (OOK) modulation. The AFE module can be switched digitally up to 25 KHz of optical frequency for visible light downlink and 1500 Hz optical frequency for IR uplink. The optical link distance can reach up to 2 meters with 0o of reception angle.
关键词： Visible light communication,Wearable patient monitoring,IR communication,Optical Wireless Communication (OWC),Analog Front-End
更新于2025-09-23 15:22:29
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A 60-m Range 6.16-mW Laser-Power Linear-Mode LiDAR System With Multiplex ADC/TDC in 65-nm CMOS
摘要： This paper presents a linear-mode light detection and ranging (LiDAR) analog front-end architecture with multiplex analog-to-digital converter/time-to-digital converter (ADC/TDC). An added voltage-to-time converter (VTC) and a reused TDC are simultaneously used to implement the ADC and TDC function, thus replacing discrete ADC and TDC, saving hardware cost and reducing power consumption. A three-stage inverter-based transimpedance amplifier (TIA) with ultra-low-power, low-noise and high/low gain mode (long/short range mode) is proposed to reduce its influence to optical signal-to-noise ratios (OSNR). The prototype TIA and ADC/TDC is fabricated in the 65-nm CMOS technology and integrated into the single-line APD-based LiDAR system. The receiver front-end of TIA and ADC/TDC only consumes 12.44-mW. The minimum detection current of the receiver front-end is less than 238 nA with bandwidth of 150MHz for long-range and weak-light detection. LiDAR achieves a measurement range of 60 m with a 70-klx direct sunlight and only 6.16 mW average laser power. Experimental results show that this architecture is suitable for low-cost multi-line integrated LiDAR applications compared to conventional architecture using ADC, TDC, ADC+TDC architecture.
关键词： VTC,measurement range,ADC/TDC,TIA,optical signal-to-noise ratios,APD,analog front-end,CMOS,LiDAR,power consumption
更新于2025-09-16 10:30:52
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[IEEE 2018 10th International Conference on Information Technology and Electrical Engineering (ICITEE) - Bali, Indonesia (2018.7.24-2018.7.26)] 2018 10th International Conference on Information Technology and Electrical Engineering (ICITEE) - A Circuit for Robust Visible Light Communication Systems in Indoor Environment
摘要： In the recent decades, Visible light communication (VLC) becomes the favorite research topic in the world. VLC has been successfully applied to the outdoor or indoor area though not yet en masse. The VLC transceivers operating in typical indoor environments are subject to intense ambient light, emanating from both natural and artificial sources. The primary sources of ambient light as mentioned before are the background light comes from sunlight, DC light sources (LED bulb & flashlight), incandescent and fluorescent lamps. These signal must be filtered-out because it will make the received signal distortion. Previous research about low-cost Analog Front-End (AFE) circuit has been carried out on the simulation only. This research is trying to test the designed AFE receiver circuit on the laboratory. Moreover, we add the several analog blocks to be involved. The test data obtained; the designed circuit able to compensate the optical noise. It makes VLC system has robustness ability from other lights in the indoor environment.
关键词： Indoor Environment,Visible light communication,Robust VLC,Analog Front-End
更新于2025-09-10 09:29:36
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An Ultra-Compact Low Power Self-Capacitive Touch Screen Readout IC Embedding Reconfigurable Noise Immunity and Current-Driven Capacitance Compensation
摘要： This brief presents the design of a readout IC for dot-matrix, self-capacitive touch screen system. To accommodate only a capacitive change with large base capacitance of electrodes, it employs an encoded multiple sensing method as well as current-driven offset compensator, that strike circuit complexity, power consumption and handling range of the base capacitance. The current-driven offset compensator can provide compensation current up to 300 μA with a 4-bit tunable magnitude and mismatch calibration between source and sink currents. It can also perform adaptive noise rejection for in-band as well as out-band interferences by introducing hybrid touch screen panel (TSP) drive scheme. The measurement results show that it achieves 47.2 dB signal-to-noise ratio (SNR) and 31 dB in-band noise rejection with 220 kHz TSP drive frequency and 330 Hz scan rate when a 4 mm metal pillar is used. The proposed front end circuit, fabricated on a 130-nm CMOS technology, occupies an area of 0.128 mm2 and consumes 1.04 mW of power for 16 channels 1.3-in, dot-matrix On-cell TSP for rigid OLED.
关键词： TSP analog front end,Touch screen panel,Current conveyor
更新于2025-09-04 15:30:14