• 센서학회지
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• 제26권3호
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• pp.155-159
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• 2017

The analog-to-digital converter (ADC) is an important component in various fields of sensor signal processing. This paper presents an expandable flash analog-to-digital converter (E-flash ADC) for sensor signal processing using a comparator, a subtractor, and a multiplexer (MUX). The E-flash ADC was simulated and designed in $0.35-{\mu}m$ standard complementary metal-oxide semiconductor (CMOS) technology. For operating the E-flash ADC, input voltage is supplied to the inputs of the comparator and subtractor. When the input voltage is lower than the reference voltage, it is outputted through the MUX in its original form. When it is higher than the reference voltage, the reference voltage is subtracted from the input value and the resulting voltage is outputted through the MUX. Operation of the MUX is determined by the output of the comparator. Further, the output of the comparator is a digital code. The E-flash ADC can be expanded easily.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(2)
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• pp.197-200
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• 2002

In this paper, presents a 1.8V 8-bit 300MSPS CMOS Subranging Analog to Digital Converter (ADC) with a novel reference multiplex is described. The proposed hか converter is composed of Sub A/D Converter block, MUX (Multiplexer) block and digital block. In order to obtain a high-speed operation, further, a novel dynamic latch, an encoder of novel algorithm and a MUX block are proposed. As a result, this A/D Converter is operated 100MHz input frequence by 300MHz sampling rate.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 1989년도 추계학술발표회논문집
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• pp.31-36
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• 1989

Low-cost and automated isolux diagram measurement system are investigated. The system is constructed with illuminance measurement array, analog multiplexer, A/D converter and 16-bit microcomputer. The experimental results show good agreement with the measured illuminance values. Decreasing the measure-spacing, the more accurate diagram can be obtained.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1987년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 16-17 Oct. 1987
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• pp.87-90
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• 1987

This paper gives the Sonic Range Finder(SRF) Array which detects the unknown obstacles on the mobile robot's path. This SRF Array gives mobile robot's circumstance information wider, processes and transfers them to the locomotion module to construct the modify path. In this system, 8 pairs of the 40 KHz ultrasonic sensors constitute the SRF Array, including a pair of reference sensors to correct the errors, 4051 analog multiplexer and demultiplexer swtch the sensor with time and 8031-on chip micro computer controls processes the data and communication the others.

• 전기전자학회논문지
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• 제28권2호
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• pp.228-233
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• 2024

근래의 코로나 시대로 인해 접촉에 의한 감염을 방지하기 위해 다양한 방법들을 강구하고 있다. 그중 생활 속에서 많은 접촉이 일어나고 있는 엘리베이터에서의 감염 방지를 위해 비접촉 버튼을 개발하였다. 본 연구에서는 능동 차폐(active shield) 방식의 정전용량(capacitance) 센서를 이용하여 손가락이 접근했을 때의 커패시턴스 변화를 감지한다. 정전 전력 소모(static power consumption)가 없으며, 아날로그 멀티플렉서를 사용하여 일정 시간마다 돌아가면서 버튼을 센싱 하는 방식을 사용하여 상대적으로 가격이 비싼 센서칩을 하나만 사용하였다. 엘리베이터 버튼뿐만 아니라 터치 버튼, 자동문 등 일상에서 많은 사람들이 접촉하는 버튼을 높은 비용 추가 없이 대체 가능하다.

• 한국멀티미디어학회논문지
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• 제13권12호
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• pp.1767-1777
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• 2010

In digital TV broadcasting, such as terrestrial, cable, satellite, and IPTV, the head-end of digital TV broadcasting has a more complicated transmission structure than that of analog TV broadcasting. Furthermore, digital TV broadcasting has a feature that supports multiplex models, such as Multiple Program Transport Stream (MPTS). Therefore, the purpose of our work was to design and examine a more efficient new system of emergency alert message transmission to support the digital TV broadcasting environments. Digital TV broadcasting is the IP generation or RF transmission of 8-VSB, QAM, and QPSK modulated through a multiplexer or re-multiplexer multiplexed stream as a MPEG-2 Transport Stream after content encoding. The new system proposed in this paper transmits an emergency alert message without scrambling after replacing the PID and payload of the -packet with the message prototype in the TS stream from the multiplexer. If we need to transmit an emergency alert message under digital TV broadcasting services, then the receiver first checks the PID of each packet in the TS stream for the emergency alert message. Next, if a packet is determined to be an emergency alert message, then the set-top box displays the message on the TV screen using its function of On Screen Display, or the PC based software displays the message on the monitor screen using its function of overlay with user interface if the packet is found to be an emergency alert message. We have designed an emergency alert message protocol and a system model. By experiments and analysis of the system, we concluded that the system achieved efficiency and the ability to send and receive emergency alert messages using the system under different digital TV broadcasting service environments.

• JSTS:Journal of Semiconductor Technology and Science
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• 제17권1호
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• pp.129-140
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• 2017

In this paper, a $4{\times}32$-channel neural recording system capable of acquiring neural signals is introduced. Four 32-channel neural recording ICs, complex programmable logic devices (CPLDs), a micro controller unit (MCU) with USB interface, and a PC are used. Each neural recording IC, implemented in $0.18{\mu}m$ CMOS technology, includes 32 channels of analog front-ends (AFEs), a 32-to-1 analog multiplexer, and an analog-to-digital converter (ADC). The mid-band gain of the AFE is adjustable in four steps, and have a tunable bandwidth. The AFE has a mid-band gain of 54.5 dB to 65.7 dB and a bandwidth of 35.3 Hz to 5.8 kHz. The high-pass cutoff frequency of the AFE varies from 18.6 Hz to 154.7 Hz. The input-referred noise (IRN) of the AFE is $10.2{\mu}V_{rms}$. A high-resolution, low-power ADC with a high conversion speed achieves a signal-to-noise and distortion ratio (SNDR) of 50.63 dB and a spurious-free dynamic range (SFDR) of 63.88 dB, at a sampling-rate of 2.5 MS/s. The effectiveness of our neural recording system is validated in in-vivo recording of the primary somatosensory cortex of a rat.

• ETRI Journal
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• 제28권1호
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• pp.103-106
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• 2006

We have fabricated a planar lightwave circuit (PLC) hybrid-integrated optical sub-assembly of a triplexer using a thin film filter (TFF)-attached wavelength division multiplexer (WDM) and photodiode (PD) carriers. Two types of TFFs were attached to a diced side of a silica-terraced PLC platform, and the PD carriers with a $45^{\circ}$ mirror on which pin-PDs were bonded were assembled with the platform. A clear transmitter eye-pattern and minimum receiver sensitivity of -24.5 dBm were obtained under 1.25 Gb/s operation for digital applications, and a second-order inter-modulation distortion (IMD2) of -70 dBc was achieved for an analog receiver.

• 센서학회지
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• 제3권1호
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• pp.54-60
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• 1994

본 논문에서는 멀티센서 신호처리용 집적회로를 구성하였다. 제안된 회로는 멀티센서 신호 선택을 위한 아날로그 멀티플렉서, 노이즈 제거와 신호증폭을 위한 능동 필터, 디지탈 신호처리부와의 인터페이스를 위한 샘플-홀드 회로 등으로 구성하였다. 이러한 기능회로들을 CMOS 트랜지스터로 설계하여 집적화를 가능케 하였으며, 이로 인해 멀티센서 신호처리 시스템의 저소비전력화, 소형화를 구현케하였다.

• 한국통신학회논문지
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• 제9권3호
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• pp.127-131
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• 1984

벡터-매트릭스 곱셈을 인코히어런트(incoherent)광원에 의해 빠른 속도로 대량의 정보를 처리할 수 있는 IOVMM(incoherent optical vector matrix multiplier)을 구성하고 실험결과와 이론치를 비교하였다. 입력 벡터 및 매트릭스의 원소들은 양의 실수로만 국한시키고 입력 벡터는 LED배열로 나타내었으며 매트릭스는 마스크상에 면적변조방식으로 부호화하였다. 이 두 곱셈의 결과는 렌즈계를 통하여 포토 다이오우드 배열로 검출하였으며 하나의 채널로 출력신호를 관찰하기 위하여 애널로그 멀티플렉스를 사용하였다.