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Author: search.filters.author.Cheypoca, ThepjitSubject: search.filters.subject.OTA

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    OTA-based capacitance-to-period converter for capacitive sensors
    (2013-03-28)
    Kanjanapart, Naratorn
    ;
    Cheypoca, Thepjit
    ;
    Riewruja, Vanchai
    ;
    Petchmaneelumka, Wandee
    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.
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    OTA-based electronically variable floating inductance simulator
    (2011-12-01)
    Longsomboon, Kittisak
    ;
    Petchmaneelumka, Wandee
    ;
    Cheypoca, Thepjit
    ;
    Riewruja, Vanchai
    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.
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    Electronically adjustable PD controller using OTAs
    (2011-01-01)
    Petchmaneelumka, Wandee
    ;
    Cheypoca, Thepjit
    ;
    Riewruja, Vanchai
    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.