• Proceedings of the Korean Institute of Intelligent Systems Conference
• /
• 1993.06a
• /
• pp.929-932
• /
• 1993

A fuzzy microcontroller is presented implementing a simplified inference mechanism. Fuzzification, rule composition and defuzzification are carried out by means of (basically) analog current-mode CMOS circuits operating in strong inversion. Also a voltage interface is provided with the external world. Combining analog and digital techniques allow a programming capability.

• Journal of Semiconductor Engineering
• /
• v.1 no.2
• /
• pp.64-73
• /
• 2020

As CMOS technology scales down, the design of analog signal processing circuit becomes far more difficult because of steadily decreasing supply voltage and smaller intrinsic gain of transistors. With sub-1V supply voltage, the conventional analog signal processing relying on high-gain amplifiers is not an effective solution and different approach has to be sought. One of the promising approaches is "time-domain analog signal processing" which exploits the improving switching speed of transistors in a scaled CMOS technology. In this paper, various time-domain analog signal processing techniques are explained with some experimental results.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.59 no.8
• /
• pp.1489-1496
• /
• 2010

A feed forward differential architecture of analog PRML decoder is investigated to implement on analog parallel processing circuits. The conventional PRML decoder performs the trellis processing with the implementation of single stage in digital and its repeated use. The analog parallel processing-based PRML comes from the idea that the decoding of PRML is done mainly with the information of the first several number of stages. Shortening the trellis processing stages but implementing it with analog parallel circuits, several benefits including higher speed, no memory requirement and no A/D converter requirement are obtained. Most of the conventional analog parallel processing-based PRML decoders are differential architecture with the feedback of the previous decoded data. The architecture used in this paper is without feedback, where error metric accumulation is allowed to start from all the states of the decoding stage, which enables to be decoded without feedback. The circuit of the proposed architecture is simpler than that of the conventional analog parallel processing structure with the similar decoding performance. Characteristics of the feed forward differential architecture are investigated through various simulation studies.

• The Journal of the Convergence on Culture Technology
• /
• v.4 no.4
• /
• pp.379-385
• /
• 2018

The transmission of analog signals through Galvanic isolators often results in signal distortion. Optocoupler gain is temperature dependent and also varies considerably, which would cause deformations of analog signals. Digital isolators have better noise immunity than analog, and digital transmission is a cost-effective noise rejection method for multichannel analog signals, which can solve temperature-induced signal distortion problems. Digital data, converted from multichannel analog signals, can be transmitted through a single optocoupler. We proposed advanced circuits and data frame for robust transmission of multichannel analog signals. Numerical experiments were performed to investigate distortion of multichannel analog signals during transmission.

• IEMEK Journal of Embedded Systems and Applications
• /
• v.14 no.1
• /
• pp.33-41
• /
• 2019

We propose an embedded solution to design a high-speed and high-accuracy 16bit analog-digital signal processing interface for the control systems using various external analog signals. Choosing TMS320F28377D micro controller unit (MCU) featuring high-performance processing in the 32-bit floating point operation, low power consumption, and various I/O device supports, we design and build the proposed system that supports both 16-bit analog-digital converter (ADC) interface and high precision digital-analog converter (DAC) interface. The ADC receives voltage-level differential signals from fully differential amplifiers, and the DAC communicates with MCU through 50 MHz bandwidth high-fast serial peripheral interface (SPI). We port the boot loader and device drivers to the implemented board, and construct the firmware development environment for the application programming. The performance of the entire implemented system is demonstrated by analog-digital signal processing tests, and is verified by comparing the test results with those of existing similar systems.

• Journal of information and communication convergence engineering
• /
• v.15 no.4
• /
• pp.232-236
• /
• 2017

A digital vacuum pressure sensor is designed, fabricated, and characterized using a packaged MEMS analog Pirani gauge. The packaged MEMS analog Pirani gauge requires a current source to heat up a heater in the Pirani gauge. To investigate the feasibility of digitization for the analog Pirani gauge, its implementation is performed with a zero-temperature coefficient current source and microcontroller that are commercially available. The measurement results using the digital vacuum pressure sensor showed that its operating range is 0.05-760 Torr, which is the same as the measurement results of the packaged MEMS analog pressure sensor. The results confirm that it is feasible to integrate the analog Pirani gauge with a commercially available current source and microcontroller. The successful hybrid integration of the analog Pirani gauge and digital circuits is an encouraging result for monolithic integration with a precision current source and ADCs in the state of CMOS dies.

• Proceedings of the IEEK Conference
• /
• 2001.06b
• /
• pp.301-304
• /
• 2001

The analog multiplier is very useful building block in many circuits such as filter, frequency-shifter, and modulators. In recent year, The main design issue of circuit designer is low-voltage/low-power system design, because of all systems are recommended very integrated system and portable system In this paper, the proposed the four-quadrant analog multiplier is using the bulk-driven techniques. The bulk-driven technique is very useful technique in low-voltage system, compare with gate-driven technique. therefore the proposed analog multiplier is operated in 1V supply voltage. And the proposed analog multiplier is low power dissipation compare with the others. therefor the proposed analog multiplier is convenient in low-voltage/low-power in system.

• Archives of Pharmacal Research
• /
• v.29 no.12
• /
• pp.1140-1146
• /
• 2006

Ceramide analogs are potential chemotherapeutic agents. We report that a ceramide analog induces apoptosis in human prostate cancer cells. The ceramide analog induced cell death through an apoptotic mechanism, which was demonstrated by DNA fragmentation, the cleavage of poly ADP ribose polymerase (PARP), and a loss of membrane asymmetry. Treating the cells with ceramide analog resulted in the release of various proapoptotic mitochondrial proteins including cytochrome c and Smac/DIBLO into the cytosol, and a decrease in the mitochondrial membrane potential. In addition, the ceramide analog decreased the phospho-Akt and phospho-Bad levels. The expression of the antiapoptotic Bcl-2 decreased slightly with increasing Bax to Bcl-2 ratio. These results suggest that the ceramide analog induces apoptosis by regulating multiple signaling pathways that involve the mitochondrial pathway.

• Proceedings of the Korean Society of Disaster Information Conference
• /
• 2015.11a
• /
• pp.317-318
• /
• 2015

이 연구에서는 아날로그 기반의 고화질 전송 시스템(HD Analog system)에 관하여 고찰하였다. 오늘날 영상감시시스템은 고해상도 적용을 위한 기술개발을 통해 고품질의 영상을 구현할 수 있는 HD-SDI나 Network camera로 전환되고 있다. 그러나 Network camera는 기존 시스템과의 현격한 구성 차이로 전체 시스템을 다시 구축해야 하고, HD-SDI는 저가형 케이블 등에서는 만족할 만한 성능이 보장되지 않았다. 이러한 배경에서 등장한 것이 HD Analog system이다. HD Analog system은 기존 동축케이블을 이용할 수 있으며 저가형 케이블에서도 최대 500m 이상 전송이 가능하고, 구축비용을 절감할 수 있는 장점이 있다. 그러나 제조사별 시스템의 호환 문제 등을 해소하기 위한 표준화는 HD Analog system의 성장을 위한 선결과제로 제기된다.

• Proceedings of the KIEE Conference
• /
• 1988.11a
• /
• pp.36-41
• /
• 1988

Analog and Digital Speed Control Systems have mutually complementary properties. Analog System has good dynamic characteristics and moderate steady-state accuracy and can be implemented economically with operational a ampliers. Digital System, on the contray, has good static accuracy, but relatively poor dynamic property. So, a hybrid system which uses both digital and analog control can have good static and dynamic characteristics. In this paper, it is shown that a simple digital controller can improve steady-state accuracy of existing analog control system satisfactorily, and some design criteria are presented also.