• Title/Summary/Keyword: instrumentation amplifier

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Analog Front-End IC for Automotive Battery Sensor (차량 배터리 센서용 Analog Front-End IC 설계)

  • Yeo, Jae-Jin;Jeong, Bong-Yong;Roh, Jeong-Jin
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.48 no.10
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    • pp.6-14
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    • 2011
  • This paper presents the design of the battery sensor IC for instrumentation of current, voltage using delta-sigma ADC. The proposed circuit consists of programmable gain instrumentation amplifier (PGIA) and second-order discrete-time delta-sigma modulator with 1-bit quantization were fabricated by a 0.25 ${\mu}m$ CMOS technology. Design circuit show that the modulator achieves 82 dB signal-to-noise ratio (SNR) over a 2 kHz signal bandwidth with an oversampling ratio (OSR) of 256 and differential nonlinearity (DNL) of ${\pm}$ 0.3 LSB, integral nonlinearity (INL) of ${\pm}$ 0.5 LSB. Power consumption is 4.5 mW.

Class D Amplifier Using Multi-Level switching and ZVS (Multi-Level Switching과 ZVS를 이용한 Class D Amplifier)

  • Kim Duil;Kim Hee-Jun;Cho Kyu-Min
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.1154-1157
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    • 2004
  • This paper presents design of a class D Amplifier using multi-level switching and Zero-Voltage-Switching(ZVS) technique. The amplifier circuit features zero voltage switching at all switches of the circuit and multi-level switching operation so that the higher efficiency and lower THD could be achieved. A 50-W prototype D class amplifier built and tested it. As a result, the maximum efficiency of $96\%$ and the THD of under $60\%$ were obtained.

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Electronically adjustable gain instrumentation amplifier

  • Julprapa, A.;Chaikla, A.;Ukakimaparn, P.;Parnklang, J.;Suphap, S.;Reiwruja, V.
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.158.3-158
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    • 2001
  • In this paper, an instrumentation amplifier, which the voltage gain can be electronically adjusted, is proposed. The realization method is based on the use of operational transconductance amplifiers (OTAs) as active circuit elements. The common mode rejection ratio (CMRR) of the proposed scheme is better than 93dB at the frequency of about 70kHz. The temperature effect to the circuit performance is also compensated. Experimental and simulation results demonstrating the characteristics of the proposed scheme are also included.

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Recent Advances in Radiation-Hardened Sensor Readout Integrated Circuits

  • Um, Minseong;Ro, Duckhoon;Kang, Myounggon;Chang, Ik Joon;Lee, Hyung-Min
    • Journal of Semiconductor Engineering
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    • v.1 no.3
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    • pp.81-87
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    • 2020
  • An instrumentation amplifier (IA) and an analog-to-digital converter (ADC) are essential circuit blocks for accurate and robust sensor readout systems. This paper introduces recent advances in radiation-hardening by design (RHBD) techniques applied for the sensor readout integrated circuits (IC), e.g., the three-op-amp IA and the successive-approximation register (SAR) ADC, operating against total ionizing dose (TID) and singe event effect (SEE) in harsh radiation environments. The radiation-hardened IA utilized TID monitoring and adaptive reference control to compensate for transistor parameter variations due to radiation effects. The radiation-hardened SAR ADC adopts delay-based double-feedback flip-flops to prevent soft errors which flips the data bits. Radiation-hardened IA and ADC were verified through compact model simulation, and fabricated CMOS chips were measured in radiation facilities to confirm their radiation tolerance.

Implementation of an analog front-end for electroencephalogram signal processing (뇌전도 신호 처리용 아날로그 전단부 구현)

  • Kim, Min-Chul;Shim, Jae Hoon
    • Journal of Korea Society of Industrial Information Systems
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    • v.18 no.5
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    • pp.15-18
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    • 2013
  • This paper presents an analog front-end for electroencephalogram(EEG) signal processing. Since EEG signals are typically weak and located at very low frequencies, it is imperative to implement an amplifier with high gain, high common-mode rejection ratio(CMRR) and good noise immunity at very low frequencies. The analog front-end of this paper consists of a programmable-gain instrumentation amplifier and a band-pass filter. A frequency chopping technique is employed to remove the low-frequency noise. The circuits were fabricated in 0.18um CMOS technology and measurements showed that the analog front-end has the maximum gain of 60dB and >100dB CMRR over the programmable gain range.

Optimal Design for CMOS Analog Hearing Aid OP Amp Circuit (CMOS 아날로그 보청기 증폭회로의 최적 설계)

  • Jarng Soon-Suck;Chen Lingfeng
    • Proceedings of the IEEK Conference
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    • 2004.06b
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    • pp.443-446
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    • 2004
  • Short channel IC circuits become increasingly important in modern high performance electronic systems. In this paper, parts of an analog hearing aid, an amplifier and a regulator, which are implemented with short channel CMOS devices, are designed and optimized in its performance.

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Analog multiplier using operational amplifier

  • Petchmaneelumka, Wandee;Songsataya, Kiettiwan;Riewruja, Vanchai;Julsereewong, Prasit
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.868-871
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    • 2005
  • In this article, presents an analog multiplier using a general-purpose operational amplifier (opamp). The realization method is based on the quarter-square technique, which utilize the square-law characteristic of the class AB output stage of the opamp. The experimental results verifying the proposed multiplier performances are also included. The linearity error and the total harmonic distortion is about 0.8% and 1.6%, respectively.

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Loadcell measuring remote monitoring system development (로드셀 계측용 원격 모니터링 시스템 개발)

  • Jarng, Soon-Suck;Kim, Kyung-Suk;Won, Yong-Ill;Kim, Dae-Gon
    • Proceedings of the KIEE Conference
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    • 2005.10b
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    • pp.70-72
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    • 2005
  • The present paper designed a weight measuring instrumentation system in which data conversion and a series of signal processing were totally equipped. 16 loadcell are incoming sensors and each output of the loadcell was amplified and filtered for proper analog signal processing. Several measuring instrumentation OP amps and general purposed OP amps were used. 12 bits AID converters converted analog signals to digital bits and a PIC microprocessor controlled the 16 channels of loadcell. RF RS232 modules were used for wireless communication between the PIC microprocessor and an ethernet host for a remote sensor monitoring system development.

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16 Channel Strain Gauge Measuring Ubiquitous System Development (유비쿼터스 지향의 16채널 스트레인 게이지 계측 시스템 개발)

  • Jang, Soon-Suk;Kim, Kyung-Suk;Won, Yong-Ill;Kim, Dae-Gon
    • Journal of Institute of Control, Robotics and Systems
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    • v.12 no.9
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    • pp.912-917
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    • 2006
  • A strain gauge weight measuring instrumentation system was designed with RF sensor network facilities. In the sensor module system data conversion and a series of signal processing were totally equipped. 16 strain gauges are incoming sensors and each output of the strain gauge was amplified and filtered for proper analog signal processing. Several measuring instrumentation OP amps and general purposed OP amps were used. 12 bits A/D converters converted analog signals to digital bits and a PIC microprocessor controlled the 16 channels of strain gauges. RF RS232 modules were used for wireless communication between the PIC microprocessor and an Ethernet host far a remote sensor monitoring system development.

A Low-Power Portable ECG Touch Sensor with Two Dry Metal Contact Electrodes

  • Yan, Long;Yoo, Hoi-Jun
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.10 no.4
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    • pp.300-308
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    • 2010
  • This paper describes the development of a low-power electrocardiogram (ECG) touch sensor intended for the use with two dry metal electrodes. An equivalent ECG extraction circuit model encountered in a ground-free two-electrode configuration is investigated for an optimal sensor read-out circuit design criteria. From the equivalent circuit model, (1) maximum sensor resolution is derived based on the electrode's background thermal noise, which originates from high electrode-skin contact impedance, together with the input referred noise of instrumentation amplifier (IA), (2) 60 Hz electrostatic coupling from mains and motion artifact are also considered to determine minimum requirement of common mode rejection ratio (CMRR) and input impedance of IA. A dedicated ECG read-out front end incorporating chopping scheme is introduced to provide an input referred circuit noise of 1.3 ${\mu}V_{rms}$ over 0.5 Hz ~ 200 Hz, CMRR of IA > 100 dB, sensor resolution of 7 bits, and dissipating only 36 ${\mu}W$. Together with 8 bits synchronous successive approximation register (SAR) ADC, the sensor IC chip is implemented in 0.18 ${\mu}m$ CMOS technology and integrated on a 5 cm $\times$ 8 cm PCB with two copper patterned electrodes. With the help of proposed touch sensor, ECG signal containing QRS complex and P, T waves are successfully extracted by simply touching the electrodes with two thumbs.