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An Accurate CCII-Based Voltage Controlled Current Source
Anucha Kaewpoonsuk,Vanchai Riewruja,Apinai Rerkratn,Thawatchai Kamsri 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
In this paper, a voltage controlled current source (VCCS) providing low distortion in output signal and wide output current range is introducted. In order to obtain the high accuracy, the proposed technique employs the designed scheme to connect in feedback loop of the basic VCCS based on second generation current conveyor (CCII). This scheme consists of instrumentation and differential amplifiers and one resistor. The performances of the proposed circuit were studied through the use of PSPICE simulation program. Simulation results are agreed with the expected values.
Apinai Rerkratn,Amata Luangpol,Vanchai Riewruja,Wandee Petchmaneelumka 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
A simple technique to realize demodulator for linear variable differential transformer (LVDT) is presented in this paper. The proposed LVDT demodulator is based on sample and hold technique. The proposed scheme consists of peak detector, phase detector, monostable circuit, sample and hold circuit, and controllable unity-gain inverting/noninverting amplifier. The presented technique employs the simple and low-cost devices such as op-amp, and digital logic gate. Experimentation with the commercial LVDT model OP12.5G from Solartron metrology shows that the proposed LVDT demodulator provides the output voltage corresponding to the movement of LVDT core with satisfactory values and good linearity. The maximum error of the proposed demodulator is about 1.5%. In addition, the output magnitude of proposed LVDT demodulator can be adjusted by variable resistor (VR1) without the external circuit requirement.
OTA-based Floating Inductance Simulator
Chitpol Koomgaew,Wandee Petchmaneelumka,Vanchai Riewruja 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A simple circuit technique to realise a floating inductance simulator for system response compensation is presented in this paper. The circuit implementation is based on the use of the operational transconductance amplifiers (OTAs) as active elements. The proposed circuit converts a grounded capacitance into a floating inductance with electronically variable properties. The proposed inductor is attractive in terms of simple configuration and low cost. Experimental results verifying the performances of the proposed circuit are also included.
Electronically adjustable phase shifter using OTAs
Kanoknuch Songsuwankit,Wandee Petchmaneelumka,Vanchai Riewruja 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
First-order phase shifter using operational transconductance amplifiers (OTAs) as active elements is presented in this paper. The corner frequency of the proposed phase shifter can be adjusted by electronic means. The purpose of this paper is emphasized on simple configuration and low cost. The phase response between input and output signals against the operating frequency is varied from 180 to 0 degrees of phase lead. The principle of the proposed circuit is confirmed by simulation and experimental results. To verify the proposed circuit performance, the sinusoidal oscillator is provided for circuit application.
Simple Square-Root Extractor Using Op Amps
Thawatchai Kamsri,Prasit Julsereewong,Vanchai Riewruja 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper presents the simple and inexpensive method to implement a square-root extractor for voltage input signal. The proposed extractor is based on the use of two operational amplifiers (op amps) as only active elements. The proposed technique employs the op amp supply-current sensing to achieve an inherently quadratic characteristic. The low-output distortion in output signal can be achieved. Experimental results verifying the characteristic of the proposed circuit are also included.
Low-Cost Resolver-to-DC Converter
Jakkapun Tongcharoen,Wandee Petchmaneelumka,Vanchai Riewruja 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
A simple technique for implementation of resolver-to-DC converter is presented in this paper. The obtained output in form of DC voltage is linearly proportional to the position of motor shaft angle. The configuration of proposed converter consists of commercial available circuit building blocks such as demodulator, sine-to-triangular wave converter, logic control, and triangular-to-sawtooth converter. The proposed approach is obtained the economical attraction. Experimental results confirming the circuit performance are agreed with the expected values.
Electronically Tunable Gain Instrumentation Amplifier Using OTAs
Amphawan Julsereewong,Nuttawat Tananchai,Vanchai Riewruja 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper presents a simple method for realizing instrumentation amplifier with ease of gain adjustment. The proposed circuit consists of five operational transconductance amplifiers (OTAs) and two resistors in a balancing circuit. The differential gain of the proposed circuit can be electronically varied by changing the external bias currents of OTAs. The high common-mode rejection ratio (CMRR) can be obtained without requiring matched resistors. Experimental results showing the operational characteristics of the proposed circuit are included.