Riewruja, Vanchai
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Riewruja, Vanchai
Alternative Name
Riewruja, V.
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vanchai.ri@kmitl.ac.th
103 results
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Item type:Publication, A simple CMOS-based algorithmic ADC(2007-12-01); ; This paper presents a one-bit cell of reverse Gray-code algorithmic analog-to-digital converter. The proposed converter comprises of full-wave rectifier, current mirrors, and current comparator. The realization method is simple, small in size, and suitable for integrated circuit form. The design strategy is based on the MOS biased at the edge of conduction to provide a low accumulated error and a low distortion in the transfer characteristic. An N-bit resolution can be achieved by cascading of the N proposed one-bit cells. PSPICE simulation results supporting the characteristics of proposed circuit are agreed with the expected values. © ICROS. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Linear Variable Differential Transformer Signal Conditioning Circuit Based on Phase-Locked LoopThe purpose of this paper is to propose a novel technique for extracting the position signal from an inductive displacement transducer named a linear variable differential transformer (LVDT). In general, the movement of the LVDT core causes its primary inductance change in linear form. The primary winding of the LVDT is used as a time-dependent element for the triangular and square wave generator, which can be called self-oscillation, to generate frequency. The advantage of the proposed technique is that it can measure the displacement using the LVDT without an external oscillator. The change in primary inductance causes the frequency deviation generated by the oscillator. The deviated frequency is captured and converted into a voltage signal using the principle of the phase-locked loop. All the components used in this study are commercially available. The merits of this proposed technique are simple configuration, small size, and low cost. Moreover, the operating range of the LVDT can be extended without the limitation of the nonlinear transfer characteristic. The performance of the proposed technique is discussed in detail and confirmed by experimental implementation. Experimental results show that the maximum error from the proposed technique is about 0.42% and the operating range of the LVDT can be extended to more than 200%. It can be seen that the proposed technique is suitable for embedded measurement in small or micro robots. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Integrable CMOS-base realization of current conveyors(1991-01-01); Cheevasuvit, FusakSimple integrable circuits for implementing both positive and negative second generation current conveyors (CCII) are described. The realization method is suitable for fabrication using CMOS technology. Simulation and experimental results demonstrating the characteristics of the method are also included. © 1991 Taylor & Francis, Ltd. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A low-voltage algorithmic ADC based on gray coding(2004-11-17); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, An analog current-mode multiple-input Max/min circuit(2004-11-17); Julsereewong, PrasitThis paper presents an analog modular multiple-input Max/Min circuit, which operates in the current-mode. The maximum and minimum functions are incorporated into the same scheme with parallel processing. The realization method is suitable for fabrication using CMOS technology. The proposed circuit has a very sharp transfer characteristic and is useful building block for the real-time systems, The performances of the proposed Max/Min, circuit were studied using the PSPICE analog simulation program. The simulation results verified the circuit performances are agreed with the expected values. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, An amplitude detector for variable frequency sinusoidal signals(2006-12-01); Julsereewong, PrasitIn this paper, a JK-flip-flop-based logic circuit is described. Using two output signals of this designed logic circuit to control a buffered peak detector followed by a simple sample-and-hold circuit in sequential operation, a sinusoidal amplitude detector is proposed. The proposed detector allows the frequency of input signals to be varied over a wide range. Experimental results verifying the performances of the proposed circuit are in close agreement with the expected values. © 2006 ICASE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A class AB CMOS square-rooting circuit(1998-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A low-voltage wide-band CMOS precision full-wave rectifier(2002-06-01); Guntapong, RojanakornA simple integrable circuit for implementing a precision full-wave rectifier circuit in CMOS technology, which can be operated from a low-voltage power supply, is described. The realization method is based on the use of a MOS class AB configuration to improve the high frequency performance. The circuit exhibits a very sharp corner in the dc transfer characteristic. Simulation results showing the performance of the proposed circuit are also presented. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Simple LVDT signal to DC converter(2017-02-18); ; A simple technique to produce a linear signal from a displacement transducer, linear variable differential transformer (LVDT), is introduced in this paper. The two-quadrant divider is used to precede the ratio of a different and sum of the two winding signals from the LVDT instead of a four-quadrant divider of a recent approach. The two- quadrant divider is obtained by an operational transcondutance amplifier (OTA) in the form of a voltage-tocurrent converter. The signal from the divider is held by the sample and hold circuit (SHC) controlled by the peak-amplitude finder. As a result, the held signal is achieved without using a low-pass filter. The temperature effect of both OTA and LVDT are compensated. The merit of the proposed technique is that the circuit requires without the low-pass filter. Therefore, the fast response is obtained. The performance of the proposed scheme is confirmed by the experimental results using commercial devices. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, An accurate CMOS differential voltage-to-current converter(1994-01-01); Surawatpunya, C.A technique for implementing a differential voltage-to-current converter that is suitable for fabrication in CMOS technology is presented. The transconductance of the converter is determined by an external resistor. Very linear and accurate transconductance is obtained with a conversion error of 0-012% for an external resistance of 25 Ω. Simulation results are given to show the linearity and accuracy of the conversion circuit. The voltage-to-current converter is a versatile building block and can be applied as a current conveyor, a floating inductance, a floating negative impedance converter and an instrumentation amplifier. © 1994 Taylor & Francis Ltd.