• Title/Summary/Keyword: 능동대역필터

Search Result 50, Processing Time 0.025 seconds

Design and Realization of Phase Sensitive Detector Circuitry of Two-Channel Ring-Core Flux-Gate Compass (2-체널 링-코어 플럭스-게이트 콤파스의 위상검출 회로 설계와 구현에 관한 연구)

  • Yim, Jeong-Bin
    • Journal of Navigation and Port Research
    • /
    • v.26 no.1
    • /
    • pp.127-136
    • /
    • 2002
  • This paper Presents a discussion on the design and realization for the Phase Sensitive Defector (PSD) circuitry of Flu$\chi$-gate Compass that gives direction information to the Directional Frequency Analysis and Recording (DIFAR) Sonobuoy in Air Anti-Submarine Warfare. PSD circuitry is realized with Twin-T RC networked active band-pass filter. Results of a performance test the PSD circuitry shows that the effectiveness of band-pass filtering of desired $2F_0$ second harmonic signal, which is Pro- portional to the direction of earth's magnetic field. This resulted in the extraction of direction information.

차량 능동 현가장치의 혼합제어기 설계

  • 한기봉;이시복
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 1993.10a
    • /
    • pp.293-298
    • /
    • 1993
  • In ground vehicles, the increasing demand for safety and ride comfort which are trade-off relation, especially at high speeds, has led to the development od actively controlled suspensions. The LQG/LTR controller can be used to design a robust feedback control system that deals with disturbance rejection properties as well as insensitivity to modelling errors and sensor noise. And when the disturbance can not be measured but is limited within a certain frequency range, a bandpass feedback to eliminate the disturbance response can be used. In this paper, hybrid controller cosisted of bandpass feedback controller and LQG/LTR controller is applied to a quarter-car model moving on a randomly profiled road. The random road profile considered as colored noise is shaped from white noise by use of shaping filter. The performance of the hybrid control system is compared with that of an LQG/LTR controlled system.

  • PDF

Composite Control of Active Suspension System (차량 능동 현가장치의 성능 향상을 위한 복합제어기 설게)

  • Han, Ki-Bong;Lee, Shi-Bok
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.12 no.7
    • /
    • pp.74-81
    • /
    • 1995
  • In this paper, a composite controller cosisted of bandpass feedback controller and LQG/LTR controller is applied to a quarter-car model moving on a randomly profiled road. The LQG/LTR controller is used to achieve a design transfer toop. A bandpass feedback controller is adopted to eliminate the response due to the disturbance, which generally can not be measured, confined within an interested frequence range. The random road profile considered as colored noise is shaped from white noise by use of shaping filter. The performance of the composite control system is compared with that of an LQG/LTR control system.

  • PDF

A Low-Voltage Low-Power Analog Front-End IC for Neural Recording Implant Devices (체내 이식 신경 신호 기록 장치를 위한 저전압 저전력 아날로그 Front-End 집적회로)

  • Cha, Hyouk-Kyu
    • Journal of the Institute of Electronics and Information Engineers
    • /
    • v.53 no.10
    • /
    • pp.34-39
    • /
    • 2016
  • A low-voltage, low-power analog front-end IC for neural recording implant devices is presented. The proposed IC consists of a low-noise neural amplifier and a programmable active bandpass filter to process neural signals residing in the band of 1 Hz to 5 kHz. The neural amplifier is based on a source-degenerated folded-cascode operational transconductance amplifier (OTA) for good noise performance while the following bandpass filter utilizes a low-power current-mirror based OTA with programmable high-pass cutoff frequencies from 1 Hz to 300 Hz and low-pass cutoff frequencies from 300 Hz to 8 kHz. The total recording analog front-end provides 53.1 dB of voltage gain, $4.68{\mu}Vrms$ of integrated input referred noise within 1 Hz to 10 kHz, and noise efficiency factor of 3.67. The IC is designed using $18-{\mu}m$ CMOS process and consumes a total of $3.2{\mu}W$ at 1-V supply voltage. The layout area of the IC is $0.19 mm^2$.

Multiple vertical depression-based HMS active target detection using GSFM pulse (GSFM 펄스를 이용한 다중 수직지향각 기반 선체고정소나 능동 표적 탐지)

  • Hong, Jungpyo;Cho, Chomgun;Kim, Geunhwan;Lee, Kyunkyung;Yoon, Kyungsik
    • The Journal of the Acoustical Society of Korea
    • /
    • v.39 no.4
    • /
    • pp.237-245
    • /
    • 2020
  • In decades, active sonar, which transmits signals and detects incident signals reflected by underwater targets, has been significantly studied since passive sonar in Anti-Submarine Warfare (ASW) detection performance becomes lowered, as underwater threats become their radiated noise reduced. In general, active sonar using Hull-Mounted Sonar (HMS) adjusts vertical tilt (depression) and sequentially transmits multiple Linear Frequency Modulation (LFM) subpulses which have non-overlapped bands, i. e. 1 kHz ~ 2 kHz, 2 kHz ~ 3 kHz, in order to reduce shadow zones. Recently, however, Generalized SFM (GSFM), which is generalized form of SFM, is proposed, and it is confirmed that subpulses of GSFM have orthogonality among each other depending on setting of GSFM parameters. Hence, in this paper, we applied GSFM to active target detection using HMS to improve the performance by the signal processing gain obtained from enlarged bandwidths of GSFM subpulses compared to those of LFM subpulses. Through simulation, we verified that when the number of subpulses is three, the matched filter gain of GSFM is approximately 5 dB higher than that of LFM.

A Study on Development of High Q Active Inductor to be Used in High Frequency Band (높은 주파수대에서 사용 가능한 고품질 능동 인덕터 개발에 관한 연구)

  • 최종은;이상호;박정훈;나극환;박익모;신철재
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.11 no.3
    • /
    • pp.445-453
    • /
    • 2000
  • In this paper, the method of designing an active inductor for MMIC is proposed. The proposed tunable active inductor is composed of a cascade FET with feedback capacitors and resistors. Because of a very low series resistance in the proposed inductor, a very high Q factor can be obtained. Also it has an excellent characteristics suitable for high frequency band. The inductance value can be changed by controlling feedback capacitors, resistors and a bias voltage respectively. When the feedback resistor and parallel resistor within circuits are varied, the inductance value is changed from 0.2 nH to 1.7 nH in the range 1 to 15 GHz. Also we designed bandpass filter using the proposed active inductor and it shows the insertion loss of 0.4 dB and return loss, 20 dB.

  • PDF

Torpedo defense system research using HMS(Hull Mount Sonar) of PCC(Patrol Combat Corvette) (초계함용 HMS(Hull Mount Sonar)를 이용한 어뢰방어시스템 연구)

  • Kim, Hee-Earn;Kim, Young-Kil
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.16 no.11
    • /
    • pp.2569-2574
    • /
    • 2012
  • HMS(Hull Mount Sonar) equipment mounted on PCC(Patrol Combat Corvette) is suitably designed for active mode, and the specific character of sensor or system is not appropriate for the frequency range to detect a torpedo. In this article, in order to implement the function of detecting torpedoes with HMS of existing PCC, I will analyze the feature of input signals each PCCs and design a circuit to compensate reversely for the input signal in certain frequency. And also, I will suggest the most adequate torpedo defense system suitable for the special operating environment and the characteristic of naval vessels, implementing functions such as AGC of input signal and fixing the frequency range of different input signals per different warships.

Radiational characteristics of speaker directivity using active control (능동제어를 이용한 스피커 지향성의 방사특성)

  • Lee, Chai-Bong;Lee, Chang-Young
    • The Journal of the Korea institute of electronic communication sciences
    • /
    • v.7 no.1
    • /
    • pp.27-31
    • /
    • 2012
  • In this paper, we constructed an array of speaker system with directivity by using FXLMS(Filtered-X LMS) algorithm and confirmed its directivity. The front $0^{\circ}$ characteristics of the controlled speaker was suppressed by interfering it with the control signal produced with filter coefficients optimized with respect to the $180^{\circ}$ characteristics of the rear speakers. The directivity of the array of rear speakers was measured and the damping effect of the signal from the front speaker array was confirmed. The frequency characteristics and directivity was investigated by using the adaptive filter coefficients on damping, the damping on the control point was verified in all the frequency range. In 100Hz, 200Hz, 1000Hz regime, the damping effect was observed in the range of front $60^{\circ}{\sim}100^{\circ}$.

Design of A 1.8V 200MHz band CMOS Current-mode Lowpass Active Filter with A New Cross-coupled Gain-boosting Integrator (새로운 상호결합 이득증가형 적분기를 이용한 1.8V 200MHz대역 CMOS 전류모드 저역통과 능동필터 설계)

  • Bang, Jun-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.57 no.7
    • /
    • pp.1254-1259
    • /
    • 2008
  • A new CMOS current-mode integrator for low-voltage analog integrated circuit design is presented. The proposed current-mode integrator is based on cross-coupled gain-boosting topology. When it is compared with that of the typical current-mirror type current-mode integrator, the proposed current-mode integrator achieves high current gain and unity gain frequency with the same transistor size. As a application circuit of the proposed integrator, we designed the 1.8V 200MHz band current-mode lowpass filter. These are verified by Hspice simulation using $0.18{\mu}m$ CMOS technology.

Hardware Implementation of ECG Monitoring System (심전도(ECG) 측정 시스템의 하드웨어 구현)

  • Lee, Min-Woo;Min, Chul-Hong;Kim, Tae-Seon
    • Proceedings of the IEEK Conference
    • /
    • 2006.06a
    • /
    • pp.861-862
    • /
    • 2006
  • 본 논문에서는 차동증폭기와 대역통과 필터를 이용한 심전도측정 시스템의 구현하고 동작을 확인하였다. 구현된 하드웨어의 성능평가를 위해 동일한 입력 신호에 대한 시뮬레이션 결과와 실제 출력을 비교 하였다. 또한, 실제 동작을 확인하기 위하여 심전도 신호 중 리드 II(lead II)파형을 추출하였다. 설계된 회로는 소형화 및 경량화가 가능하기 때문에, 유비쿼터스 환경에 서 이동 중 심전도신호의 측정에 적용가능하며 능동형 게임의 감성추출에도 적용 가능할 것으로 본다.

  • PDF