Cheypoca, Thepjit
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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, Simple interface circuit for resistive/capacitive sensors(2013-01-01); ; ; This paper presents a method to realize interface circuit for resistive and capacitive sensors. The proposed circuit employs commercially available devices to generate the output signal in form of time period, which is linearly proportional to the both of sensing resistance and capacitance. Circuit configuration is simple and small in size. Experimental results verifying the performances of the proposed circuit are also included. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Bitmap picture to toolpaths converter for NC machineA simple method to create the toolpaths from bitmap picture of the workpiece for NC machine is described in this article. Halftone process is used to reproduce a continuous tone picture to binary tone picture for making a prototype picture. The obtained two dimensions picture with halftone process is employed to create the toolpaths of the sample workpiece. The workpiece dimension can be scaled to limitation of work table of NC machine by user with independent of picture resolution. The toolpaths are created as cutter location data (CL) that can be imported to postprocessor for NC machine. The proposed method is developed using visual C# programming language under window environment. Experimental implementation exhibits that the proposed bitmap picture to toolpath converter is efficient for the postprocessor to generate machine command for sculpture the workpiece from bitmap picture. ©ICROS. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, High efficiency postprocessor for generic NC machine(2010-12-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Front-end interfacing circuit for capacitive sensor(2015-01-01); ; ; This paper presents an interfacing circuit for capacitive sensor using charge amplifier formed a capacitance-to-voltage converter. The proposed circuit is suitable for the front-end analog-to-digital converter (ADC) and wide variable range of sensing capacitance. The achieved output voltage provides a linear transfer characteristic and fast response. The circuit configuration is implemented using only commercially available devices. The performances of proposed circuit are confirmed by experimental results. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, OTA-based electronically variable floating inductance simulator(2011-12-01); ; A circuit technique to implement a floating inductance simulator using operational transconductance amplifiers (OTAs) is introduced in this paper. The realization method based on the commercially available OTA, one resistor and one capacitor provides the advantage of an electronic adjusting capability. The resulting inductance can be electronically varied by tuning the external bias current of OTA. The obtained simulator is also applied in system response compensation. Experimental results verifying the circuit performances are included. © 2011 ICROS. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, OTA-based capacitance-to-period converter for capacitive sensors(2013-03-28); ; A simple design technique for realization of a capacitance-to-period converter based on operational transconductance amplifiers (OTAs) is presented in this paper. The proposed principle utilizes the behavior of astable multivibrator. The configuration of converter is implemented using commercial available and low cost devices. The obtained time period is proportional to sensing capacitance. The conversion gain of proposed scheme can be changed by electronic means. Circuit performances verified by experimental results are agreed with the expected values. © 2013 ICIC International. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Electronically adjustable PD controller using OTAs(2011-01-01); ; A method for realizing the PD controller is presented in this paper. The circuit implementation is based on operational transconductance amplifiers (OTAs) as active elements with a grounded capacitor. The proportional gain and derivative time can be electronically varied by tuning the external bias current of OTA. Moreover, the structure of the proposed scheme can be simply realized the PID controller by including resistor-capacitor series network at the output terminal. Experimental results verifying the performances of the proposed circuit are in close agreement with the theoretical values. © 2011 SICE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, 4-20mA current transceiver(2010-12-01); ; A method for realization of current transceiver is proposed in this paper. The proposed current transceiver can simultaneously transmit and receive the industrial standard current signal 4-20mA. Only one transmission loop or one pair of wire is required for current signal transmission and receive between two stations. The input and output signals are in the voltage form that is suitable and convenient for industrial applications. Realization of the proposed transceiver is based on the use of voltage-to-current converter to transmit and receive a current signal. Simulation results demonstrating the performance of the proposed scheme are agreed with the expected values. The leakage signal between input and output of transceiver in term of crosstalk is about -66.8dB. ©ICROS.