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Worapong Tangsrirat - One of the best experts on this subject based on the ideXlab platform.

  • voltage differencing transconductance amplifier based quadrature oscillator and biquadratic filter realization with all grounded passive elements
    Journal of Communications Technology and Electronics, 2018
    Co-Authors: Worapong Tangsrirat
    Abstract:

    The work realizes the sinusoidal quadrature oscillator and biquadratic filter with the same configuration using merely two voltage differencing transconductance amplifiers (VDTAs) as active devices and one grounded resistor and two grounded capacitor as passive elements. Performing the quadrature oscillator, the realized circuit is capable of producing two quadrature voltage outputs with almost equal amplitudes, and an independent electronic control of oscillation condition and oscillation Frequency. Operating in voltage-mode biquadratic filter, the circuit can simultaneously generate the bandpass and lowpass filtering functions without any matching constraints. The Natural Angular Frequency and the quality factor of the filter are independently and electronically adjustable. The effects of the VDTA non-idealities are also investigated in detail. Simulation results with TSMC 0.25 μm CMOS technology validate both working functions of the proposed circuit.

  • compact vdta based current mode electronically tunable universal filters using grounded capacitors
    Microelectronics Journal, 2014
    Co-Authors: Jetsdaporn Satansup, Worapong Tangsrirat
    Abstract:

    Abstract This paper presents a compact current-mode three-input single-output (TISO) type universal filter. Only one voltage differencing transconductance amplifier (VDTA) and two grounded capacitors are employed in the proposed filter. The circuit can realize lowpass, bandpass, highpass, bandstop and allpass biquadratic filter outputs by connecting the appropriate inputs, and offers electronic control of the Natural Angular Frequency (ω0) and quality factor (Q) by means of adjusting the transconductance gain of the VDTA. In addition, by slight modification of the proposed scheme, another more useful TISO construction with orthogonal ω0–Q tuning has been obtained. Both the discussed universal filters have been shown to have low incremental active and passive sensitivities. To demonstrate the performances of the filters and verify the theoretical analysis, computer simulations are accomplished with the PSPICE program.

  • Electronically Tunable Single-Input Five-Output Voltage-Mode Universal Filter Using VDTAs and Grounded Passive Elements
    Circuits Systems and Signal Processing, 2013
    Co-Authors: Jetsdaporn Satansup, Tattaya Pukkalanun, Worapong Tangsrirat
    Abstract:

    This paper presents a possible usage of the voltage differencing transconductance amplifier (VDTA) for the design of an electronically tunable single-input five-output voltage-mode universal filter. The presented filter is constructed using two VDTAs, two capacitors and two resistors that are all grounded. The circuit simultaneously realizes lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS) and allpass (AP) filtering responses, without changing the circuit topology. The circuit is capable of providing an independent electronic control of the Natural Angular Frequency ( ω _0) and the quality factor ( Q ) through the transconductance gains of the VDTAs. By simply adjusting the transconductance ratio, a high- Q filter can also be obtained. Because of the high-input impedance of the circuit, it is advantageous for cascade connection. To support the theoretical analysis, the properties of the designed filter have been verified by PSPICE simulation results.

  • single input three output electronically tunable universal current mode filter using current follower transconductance amplifiers
    Aeu-international Journal of Electronics and Communications, 2011
    Co-Authors: Worapong Tangsrirat
    Abstract:

    Abstract In this paper, an electronically tunable universal filter configuration with single input and three outputs (SITO) employing a recently introduced active device namely current follower transconductance amplifier (CFTA) is described. The proposed filter is composed of four CFTAs and two grounded capacitors, and is capable of realizing all the standard functions of the universal filter without requiring any component matching criterions and any extra active components. It exhibits low-input and high-output impedances, which is highly desirable for cascading in current-mode. It also offers the advantage feature of an independent electronic adjustment of the Natural Angular Frequency ( ω o ) and the quality factor ( Q ) by means of tuning the external bias currents. Moreover, a high Q -value filter can be obtained by simply adjusting the appropriate ratio of bias currents. The analysis of active and passive sensitivities is shown to be low. In order to demonstrate the performance of the proposed circuit, PSPICE simulation results are provided.

  • single resistance controlled quadrature oscillator and universal biquad filter using cfoas
    Aeu-international Journal of Electronics and Communications, 2009
    Co-Authors: Worapong Tangsrirat, Wanlop Surakampontorn
    Abstract:

    Abstract This paper presents new single-resistance-controlled (SRC) sinusoidal quadrature oscillator and universal biquad filter circuits with reduced number of passive elements using only two current-feedback operational amplifiers (CFOAs). The first proposed oscillator configuration comprising two CFOAs, three resistors and two capacitors provides two sinusoidal voltage outputs in phase quadrature. The circuit has the advantage of independent control of the condition of oscillation and the oscillation Frequency through a single resistor. The second proposed biquad filter configuration consisting of only two CFOAs, two resistors and two capacitors realizes all the standard types of the biquadratic filter functions at low-impedance output without any component matching conditions. The filter also provides orthogonal control of the Natural Angular Frequency ( ω 0 ) and the bandwidth (BW). In addition, both proposed circuit configurations have good active and passive sensitivity performances. PSPICE simulations and experimental results based on commercially available AD844-type CFOAs are included, showing the excellent performance of the proposed configurations.

Wanlop Surakampontorn - One of the best experts on this subject based on the ideXlab platform.

  • single resistance controlled quadrature oscillator and universal biquad filter using cfoas
    Aeu-international Journal of Electronics and Communications, 2009
    Co-Authors: Worapong Tangsrirat, Wanlop Surakampontorn
    Abstract:

    Abstract This paper presents new single-resistance-controlled (SRC) sinusoidal quadrature oscillator and universal biquad filter circuits with reduced number of passive elements using only two current-feedback operational amplifiers (CFOAs). The first proposed oscillator configuration comprising two CFOAs, three resistors and two capacitors provides two sinusoidal voltage outputs in phase quadrature. The circuit has the advantage of independent control of the condition of oscillation and the oscillation Frequency through a single resistor. The second proposed biquad filter configuration consisting of only two CFOAs, two resistors and two capacitors realizes all the standard types of the biquadratic filter functions at low-impedance output without any component matching conditions. The filter also provides orthogonal control of the Natural Angular Frequency ( ω 0 ) and the bandwidth (BW). In addition, both proposed circuit configurations have good active and passive sensitivity performances. PSPICE simulations and experimental results based on commercially available AD844-type CFOAs are included, showing the excellent performance of the proposed configurations.

  • cdba based universal biquad filter and quadrature oscillator
    Active and Passive Electronic Components, 2008
    Co-Authors: Worapong Tangsrirat, Tattaya Pukkalanun, Wanlop Surakampontorn
    Abstract:

    The voltage-mode universal biquadratic filter and sinusoidal quadrature oscillator based on the use of current differencing buffered amplifiers (CDBAs) as active components have been proposed in this paper. All the proposed configurations employ only two CDBAs and six passive components. The first proposed CDBA-based biquad configuration can realize all the standard types of the biquadratic functions, that is, lowpass, bandpass, highpass, bandstop, and allpass, from the same topology, and can also provide orthogonal tuning of the Natural Angular Frequency and the bandwidth (BW) through separate virtually grounded passive components. By slight modification of the first proposed configuration, the new CDBA-based sinusoidal quadrature oscillator is easily obtained. The oscillation condition and the oscillation Frequency are independently adjustable by different virtually grounded resistors. The sensitivity analysis of all proposed circuit configurations is shown to be low. PSPICE simulations and experimental results based upon commercially available AD844-type CFAs are included, which confirm the workability of the proposed circuits.

  • current differencing buffered amplifier based multiple output biquadratic filters
    IEEE Conference on Electron Devices and Solid-State Circuits, 2005
    Co-Authors: S Pisitchalermpong, Worapong Tangsrirat, Tattaya Pukkalanun, Wanlop Surakampontorn
    Abstract:

    In this paper, multiple-output multifunctional biquadratic filters using current differencing buffered amplifiers (CDBAs) as active elements are presented. The proposed circuit topologies are mainly composed of the CDBA-based cross-coupled feedback configuration and the voltage substractor. By an appropriate choice of virtually grounded passive components, the configurations can simultaneously realize lowpass, highpass, bandpass, bandstop and allpass voltage transfer functions, all at low resistance outputs. The Natural Angular Frequency and the quality factor can orthogonal controllable. PSPICE simulation results demonstrating the feasibility of the technique are also included.

  • realization of multiple output biquadratic filters using current differencing buffered amplifiers
    International Journal of Electronics, 2005
    Co-Authors: Worapong Tangsrirat, Wanlop Surakampontorn
    Abstract:

    In this paper, multiple-output multifunctional biquadratic filters using current differencing buffered amplifiers (CDBAs) as active elements are presented. The proposed circuit configuration is mainly composed of the CDBA-based cross-coupled feedback configuration and the simple CDBA-based voltage substractor. By an appropriate choice of virtually grounded passive components, the configuration can simultaneously realize lowpass, highpass, bandpass, bandstop and allpass voltage transfer functions, all at low resistance outputs. The Natural Angular Frequency and the quality factor can orthogonally controllable. Experimental results verifying the theoretical analysis are also given.

Tattaya Pukkalanun - One of the best experts on this subject based on the ideXlab platform.

  • Electronically Tunable Single-Input Five-Output Voltage-Mode Universal Filter Using VDTAs and Grounded Passive Elements
    Circuits Systems and Signal Processing, 2013
    Co-Authors: Jetsdaporn Satansup, Tattaya Pukkalanun, Worapong Tangsrirat
    Abstract:

    This paper presents a possible usage of the voltage differencing transconductance amplifier (VDTA) for the design of an electronically tunable single-input five-output voltage-mode universal filter. The presented filter is constructed using two VDTAs, two capacitors and two resistors that are all grounded. The circuit simultaneously realizes lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS) and allpass (AP) filtering responses, without changing the circuit topology. The circuit is capable of providing an independent electronic control of the Natural Angular Frequency ( ω _0) and the quality factor ( Q ) through the transconductance gains of the VDTAs. By simply adjusting the transconductance ratio, a high- Q filter can also be obtained. Because of the high-input impedance of the circuit, it is advantageous for cascade connection. To support the theoretical analysis, the properties of the designed filter have been verified by PSPICE simulation results.

  • cdba based universal biquad filter and quadrature oscillator
    Active and Passive Electronic Components, 2008
    Co-Authors: Worapong Tangsrirat, Tattaya Pukkalanun, Wanlop Surakampontorn
    Abstract:

    The voltage-mode universal biquadratic filter and sinusoidal quadrature oscillator based on the use of current differencing buffered amplifiers (CDBAs) as active components have been proposed in this paper. All the proposed configurations employ only two CDBAs and six passive components. The first proposed CDBA-based biquad configuration can realize all the standard types of the biquadratic functions, that is, lowpass, bandpass, highpass, bandstop, and allpass, from the same topology, and can also provide orthogonal tuning of the Natural Angular Frequency and the bandwidth (BW) through separate virtually grounded passive components. By slight modification of the first proposed configuration, the new CDBA-based sinusoidal quadrature oscillator is easily obtained. The oscillation condition and the oscillation Frequency are independently adjustable by different virtually grounded resistors. The sensitivity analysis of all proposed circuit configurations is shown to be low. PSPICE simulations and experimental results based upon commercially available AD844-type CFAs are included, which confirm the workability of the proposed circuits.

  • current differencing buffered amplifier based multiple output biquadratic filters
    IEEE Conference on Electron Devices and Solid-State Circuits, 2005
    Co-Authors: S Pisitchalermpong, Worapong Tangsrirat, Tattaya Pukkalanun, Wanlop Surakampontorn
    Abstract:

    In this paper, multiple-output multifunctional biquadratic filters using current differencing buffered amplifiers (CDBAs) as active elements are presented. The proposed circuit topologies are mainly composed of the CDBA-based cross-coupled feedback configuration and the voltage substractor. By an appropriate choice of virtually grounded passive components, the configurations can simultaneously realize lowpass, highpass, bandpass, bandstop and allpass voltage transfer functions, all at low resistance outputs. The Natural Angular Frequency and the quality factor can orthogonal controllable. PSPICE simulation results demonstrating the feasibility of the technique are also included.

Jetsdaporn Satansup - One of the best experts on this subject based on the ideXlab platform.

  • compact vdta based current mode electronically tunable universal filters using grounded capacitors
    Microelectronics Journal, 2014
    Co-Authors: Jetsdaporn Satansup, Worapong Tangsrirat
    Abstract:

    Abstract This paper presents a compact current-mode three-input single-output (TISO) type universal filter. Only one voltage differencing transconductance amplifier (VDTA) and two grounded capacitors are employed in the proposed filter. The circuit can realize lowpass, bandpass, highpass, bandstop and allpass biquadratic filter outputs by connecting the appropriate inputs, and offers electronic control of the Natural Angular Frequency (ω0) and quality factor (Q) by means of adjusting the transconductance gain of the VDTA. In addition, by slight modification of the proposed scheme, another more useful TISO construction with orthogonal ω0–Q tuning has been obtained. Both the discussed universal filters have been shown to have low incremental active and passive sensitivities. To demonstrate the performances of the filters and verify the theoretical analysis, computer simulations are accomplished with the PSPICE program.

  • Electronically Tunable Single-Input Five-Output Voltage-Mode Universal Filter Using VDTAs and Grounded Passive Elements
    Circuits Systems and Signal Processing, 2013
    Co-Authors: Jetsdaporn Satansup, Tattaya Pukkalanun, Worapong Tangsrirat
    Abstract:

    This paper presents a possible usage of the voltage differencing transconductance amplifier (VDTA) for the design of an electronically tunable single-input five-output voltage-mode universal filter. The presented filter is constructed using two VDTAs, two capacitors and two resistors that are all grounded. The circuit simultaneously realizes lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS) and allpass (AP) filtering responses, without changing the circuit topology. The circuit is capable of providing an independent electronic control of the Natural Angular Frequency ( ω _0) and the quality factor ( Q ) through the transconductance gains of the VDTAs. By simply adjusting the transconductance ratio, a high- Q filter can also be obtained. Because of the high-input impedance of the circuit, it is advantageous for cascade connection. To support the theoretical analysis, the properties of the designed filter have been verified by PSPICE simulation results.

Tangsrirat Worapong - One of the best experts on this subject based on the ideXlab platform.

  • Tunable Mixed-Mode Voltage Differencing Buffered Amplifier-Based Universal Filter with Independently High-Q Factor Controllability
    'MDPI AG', 2021
    Co-Authors: Roongmuanpha Natchanai, Mohammad Faseehuddin, Herencsár Norbert, Tangsrirat Worapong
    Abstract:

    This paper proposes the design of a mixed-mode universal biquad configuration, which realizes generic filter functions in all four possible modes, namely voltage mode (VM), current mode (CM), transadmittance mode (TAM), and transimpedance mode (TIM). The filter architecture employs two voltage differencing buffered amplifiers (VDBAs), two resistors and two capacitors, and can provide lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS), and allpass (AP) biquadratic filtering responses without any circuit alteration. All passive elements used are grounded, except VM. The circuit not only allows for the electronic tuning of the Natural Angular Frequency (o), but also achieves orthogonal tunability of the quality factor (Q). It also provides the feature of availability of output voltage at the low-output impedance terminal in VM and TIM, and does not require inverting-type or double-type input signals to realize all the responses. Moreover, in all modes of operation, the high-Q filter can be easily obtained by adjusting a single resistance value. Influences of the VDBA nonidealities and parasitic elements are also discussed in detail. PSPICE simulations with TSMC 0.18-µm CMOS process parameters and experimental testing results with commercially available IC LT1228s have been used to validate the theoretical predictions