• Title/Summary/Keyword: analog circuit

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Implementation of PPF Controller Using Analog Circuit and Microprocessor (아날로그 회로와 마이크로 프로세서를 이용한 PPF 제어기의 구현)

  • Heo, Seok;Kim, Ki-Young;Kwak, Moon-Kyu
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.14 no.6
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    • pp.455-462
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    • 2004
  • This paper is concerned with the implementation of the active vibration suppression controller using analog circuit and microprocessor. The target active vibration controller is the positive position feedback(PPF) controller since it provides a simple algorithm suitable for both analog circuit and digital controllers. In this study, the analog PPF controller is realized using an operational amplifier and the digital PPF controller is realized using a low-cost micro-controller. The circuit diagrams are explained in detail. We then discuss the advantages and disadvantages of both methods from the view of practical implementation. Experimental results show that both implementation methods can be effectively used for the active vibration control but need to be chosen based on the mission objective.

A Study on Voltammetry System Design for Realizing High Sensitivity Nano-Labeled Sensor of Detecting Heavy Metals (중금속 검출용 고감도 나노표지센서 구현을 위한 볼타메트리 시스템 설계 연구)

  • Kim, Ju-Myoung;Rhee, Chang-Kyu
    • Journal of Powder Materials
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    • v.19 no.4
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    • pp.297-303
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    • 2012
  • In this study, voltammetry system for realizing high sensitivity nano-labeled sensor of detecting heavy metals was designed, and optimal system operating conditions were determined. High precision digital to analog converter (DAC) circuit was designed to control applied unit voltage at working electrode and analog to digital converter (ADC) circuit was designed to measure the current range of $0.1{\sim}1000{\mu}A$ at counter electrode. Main control unit (MCU) circuit for controlling voltammetry system with 150 MHz clock speed, main memory circuit for the mathematical operation processing of the measured current value and independent power circuit for analog/digital circuit parts to reduce various noise were designed. From result of voltammetry system operation, oxidation current peaks which are proportional to the concentrations of Zn, Cd and Pb ions were found at each oxidation potential with high precision.

Techniques to Diagnose Short-Circuit Faults in the Switching Mode Power Supply for Display (디스플레이용 스위칭모드 전원장치의 단락 고장분석 검출기법)

  • Lee, Jae-Won;Chun, Tae-Won
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.7
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    • pp.1186-1192
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    • 2016
  • This paper proposes techniques to diagnose short-circuit faults of both the diodes and power FET in switching mode power supply (SMPS) by using a simple analog tester. The diodes in full-bridge rectifier, power FET, switching transformer, and some sensors are modelled with resistor. The total resistance value measured at the input terminal of a SMPS is analyzed when the short-circuit faults of diodes in a full bridge rectifier or power FET are occurred. The short-circuit faults of one or two diodes in a full bridge rectifier, power FET, and both the diodes in a full bridge rectifier and power FET can be detected by a range of total resistance, which is measured by the analog tester. Through experiments, the theoretical analysis for total resistance under short-circuit faults can be verified.

Realization of Readout Circuit Through Integrator to Average MCT Photodetector Signals of Noncontact Chemical Agent Detector (비접촉 화학작용제 검출기의 MCT 광검출기를 위한 적분기 기반의 리드아웃 회로 구현)

  • Park, Jae-Hyoun
    • Journal of Sensor Science and Technology
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    • v.31 no.2
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    • pp.115-119
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    • 2022
  • A readout circuit for a mercury-cadmium-telluride (MCT)-amplified mid-wave infrared (IR) photodetector was realized and applied to noncontact chemical agent detectors based on a quantum cascade laser (QCL). The QCL emitted 250 times for each wavelength in 0.2-㎛ steps from 8 to 12 ㎛ with a frequency of 100 kHz and duty ratio of 10%. Because of the nonconstant QCL emission power during on-duty, averaging the photodetector signals is essential. Averaging can be performed in digital back-end processing through a high-speed analog-to-digital converter (ADC) or in analog front-end processing through an integrator circuit. In addition, it should be considered that the 250 IR data points should be completely transferred to a PC during each wavelength tuning period of the QCL. To average and minimize the IR data, we designed a readout circuit using the analog front-end processing method. The proposed readout circuit consisted of a switched-capacitor integrator, voltage level shifter, relatively low-speed analog-to-digital converter, and micro-control unit. We confirmed that the MCT photodetector signal according to the QCL source can be accurately read and transferred to the PC without omissions.

Time-Domain Analog Signal Processing Techniques

  • Kang, Jin-Gyu;Kim, Kyungmin;Yoo, Changsik
    • Journal of Semiconductor Engineering
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    • v.1 no.2
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    • pp.64-73
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    • 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.

A Digital Signal Processing Circuit Design for Position Sensitive Detectors(PSD), using an FPGA

  • Bongsu Hahn;Park, Changhwan;Park, Kyihwan
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.107.1-107
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    • 2001
  • In this paper, a digital signal processing circuit for Position Sensitive Detectors(PSDs) is introduced to substitute the conventional analog signal processing circuit and to compensate disadvantages of the PSD. In general, the analog circuits have the problems such as noise accumulation, sensitivity for environmental changes, and high cost for manufacturing. Moreover, the intrinsic nonlinearity problem of the PSD makes it hard to measure the position accurately because it is difficult to be overcome the problem by using the conventional analog circuits, which can be solved by using the digital signal processing circuit. The circuit is implemented by using a Field Programmable Gate Array (FPGA). The Pulse Amplitude Modulation(PAM) method is used for reducing the environmental noise effect, and a linear interpolation logic is used to compensate the ...

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A Study On Effects of The Termination Conditions on Crosstalk in The A/D Converter Circuit (A/D 변환기 회로에서 터미네이션 임피던스의 crosstalk에 대한 영향 분석)

  • Lim, Han-Sang
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.47 no.2
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    • pp.35-42
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    • 2010
  • In this study, crosstalk between dominant interconnect pairs in an A/D converter circuit is analyzed in frequency domain and effects of termination conditions on crosstalk are described, based on the practical circuit conditions. An A/D converter circuit is a mixed circuit where both clean and noisy signals coexist such that the circuit probably suffers from distortion by crosstalk. An analog input signal and the reference voltage signal, which dominate the overall conversion performance of the A/D converter circuit, are ready to be distorted by crosstalk and include specific termination conditions, such as non-matching and capacitive termination, respectively. Thus, this study presents the model of crosstalk considering impedance mismatch at both ends and analyzes effects of the practical termination conditions in the analog input and the reference voltage interconnects on crosstalk. A typical circuit configuration of the two interconnects is described and crosstalk including near-end and far-end termination impedances is modeled. Effects of the near-end impedance mismatch in the analog input interconnect and the far-end capacitive termination in the reference voltage interconnect are estimated in the frequency domain by using the model of crosstalk and experiments are performed to confirm the estimated results. Microstrip lines are used as interconnects, involving the increase of loss in high frequencies.

A Study on Circuit Design Method for Linearity and Range Improvement of CMOS Analog Current-Mode Multiplier (CMOS 아날로그 전류모드 곱셈기의 선형성과 동적범위 향상을 위한 회로설계 기법에 관한 연구)

  • Lee, Daniel Juhun;Kim, Hyung-Min;Park, So-Youn;Nho, Tae-Min;Kim, Seong-Kweon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.15 no.3
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    • pp.479-486
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    • 2020
  • In this paper, we present a design method for improving the linearity and dynamic range of the analog current mode multiplier circuit, which is one of the key devices in an analog current mode AI processor. The proposed circuit consists of 4 quadrant translinear loops made up of NMOS transistors only, which minimizes physical mismatches of the transistors. The proposed circuit can be implemented at 117㎛ × 109㎛ in 0.35㎛ CMOS process and has a total harmonic distortion of 0.3%. The proposed analog current mode multiplier is expected to be useful as the core circuit of a current mode AI processor.

Improvement of Time-Delay of the Analog Viterbi Decoder through Minimizing Parasitic Capacitors in Layout Design (아날로그 비터비 디코더에 있어서 기생 cap성분 최소화 layout 설계에 의한 신호전파 지연 개선)

  • Kim, In-Cheol;Kim, Hyun-Jung;Kim, Hyong-Suk
    • Proceedings of the KIEE Conference
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    • 2007.04a
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    • pp.196-198
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    • 2007
  • A circuit design technique to reduce the propagation time is proposed for the analog parallel processing-based Viterbi decoder. The analog Viterbi decoder implements the function of the conventional digital Viterbi decoder utilizing the analog parallel processing circuit technology. The decoder is for the PR(1.2,2.1) signal of DVD. The benefits are low power consumption and less silicon occupation. In this paper, a propagation time reduction technique is proposed by minimizing the parasitic capacitance components in the layout design of the analog Viterbi decoder. The propagation time reduction effect of the proposed technique has been shown via HSPICE simulation.

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A New Analog Switch CMOS Charge Pump Circuit without Body Effect

  • Parnklang, Jirawath;Manusphrom, Ampual;Laowanichpong, Nut;Tongnoi, Narongchai
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.212-214
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    • 2005
  • The charge-pump circuit which is used to generate higher voltage than the available supply voltage has wide applications such as the flash memory of EEPROM Because the demand for high voltage comes from physical mechanism such as the oxide tunneling, the required pumped voltage cannot be scaled as the power supply voltage is scaled. Therefore, an efficient charge-pump circuit that can achieve high voltage from the available low supply voltage is essential. A new Analog Switch p-well CMOS charge pump circuit without the MOS device body effect is processed. By improve the structure of the circuit's transistors to reduce the threshold voltage shift of the devices, the threshold voltage of the device is kept constant. So, the circuit electrical characteristics are higher output voltage within a shorter time than the conventional charge pump. The propose analog switch CMOS charge pump shows compatible performance of the ideal diode or Dickson charge pump.

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