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Active-only current-mode first-order allpass filter and its application in quadrature oscillator
(2015-08-01)
Jantakun, Adirek
;
Jaikla, Winai
The current-mode first-order allpass filter (APF) using only the active elements has been studied in the present paper. The proposed circuit comprises two operational transconductance amplifiers (OTAs) and one operational amplifier (OA) which is suitable to future development into an integrated circuit. The pole frequency and phase response can be electronically adjusted with changing the dc bias currents of OTAs. The APF has high output impedance, which is easy to cascade in high-order filter or drive load without using a buffering device. The current-mode quadrature oscillator is included to show the usability of the proposed filter. The results of PSPICE simulation are accordant with the theoretical analysis.
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Current-mode MISO filter using CCCDTAs and grounded capacitors
(2015-07-01)
Chaichana, Amornchai
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Jantakun, Adirek
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Kumngern, Montree
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Jaikla, Winai
This paper presents the current-mode multi-input single-output (MISO) biquadratic filter using current-controlled current differencing tranconductance amplifier (CCCDTA) as an active building block. The proposed circuit comprises three CCCDTAs and two grounded capacitors performing completely standard functions: low-pass, high-pass, band-pass, bandreject and all-pass functions and does not require double input current signals as well as inverting input currents. The pole frequency and quality factor of the proposed circuit can be adjusted electronically/independently via dc bias currents. In addition, the filter circuit has low-input and high-output impedance which facilitates easy connecting for current-mode circuit. The proposed circuit uses all grounded capacitors which is very suitable to further develop into an integrated circuit and without requiring any matching condition. Moreover, the active and passive sensitivities are low. The PSPICE simulation results are included to show the workability of the proposed circuit.
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New current-controlled current-mode sinusoidal quadrature oscillators using CDTAs
(2015-01-01)
Summart, Saksit
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Thongsopa, Chanchai
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Jaikla, Winai
This article presents new current-mode oscillator circuits using CDTAs which is designed from block diagram. The proposed circuits consist of three CDTAs and two grounded capacitors. The condition of oscillation can be adjusted electronically/orthogonally from the oscillation frequency by adjusting bias current of the CDTAs. The proposed quadrature oscillators have high output impedance and use only grounded capacitors without any external resistor which is very appropriate for future development into an integrated circuit. The PSPICE simulation and experimental results are corresponding to the theoretical analysis.
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CCCIIs-based sinusoidal quadrature oscillators with non-interactive control of condition and frequency
(2014-01-01)
Summart, Saksit
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Thongsopa, Chanchai
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Jaikla, Winai
The paper presents two current-mode quadrature oscillators with non-interactive two current controls for both of the condition of oscillation (CO) and the frequency of oscillation (FO) using current controlled current conveyors (CCCIIs). The proposed oscillators can provide two sinusoidal output currents with 90 degrees phase difference. It also provides high output impedances that make the circuit can directly drive load without additional current buffer. The condition of oscillation and frequency of oscillation can be controlled by adjusting the bias currents of the CCCIIs. The proposed circuits use only grounded capacitors without any external resistor which is very appropriate for further development into an integrated circuit. The results of PSPICE simulation program are corresponding to the theoretical analysis. Copyright © 2012 The Council of Scientific and Industrial Research, New Delhi.
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Dual-output current differencing transconductance amplifiers-based current-mode sinusoidal quadrature oscillators
(2014-01-01)
Summart, Saksit
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Thongsopa, Chanchai
;
Jaikla, Winai
This paper presents three current-mode quadrature oscillator (QO) circuits based on dual-output current differencing transconductance amplifier (DO-CDTA) which is designed from block diagram. The proposed circuits consist of two DO-CDTAs and two grounded capacitors. The circuits can provide two sinusoidal output currents with 90° phase difference. The condition of oscillation (CO) can be adjusted independently from the frequency of oscillation (FO) by adjusting the bias currents of the DO-CDTA. The proposed circuits have high output impedance appropriate for cascade connection application in current mode which is capable to directly drive load. The circuits use only grounded capacitors without any external resistor which is very appropriate for further development into an integrated circuit. Moreover, the oscillator circuits can also adjust amplitude of the output signal. The results of PSPICE simulation program are corresponding to the theoretical analysis. © 2014 World Scientific Publishing Company.
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Design of electronically tunable first order allpass filter using OTAs with gain controllability
(2013-12-31)
Prommas, Thawach
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Jaikla, Winai
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Suwanjan, Peerawut
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Silapan, Phamorn
This paper presents current-mode first-order allpass filter using three operational transconductance amplifiers (OTAs) and grounded capacitor. The use of grounded capacitor makes the circuit more suitable for integrated circuit implementation. The current gain and phase shift can be independently controlled with electronic method. The circuit has high output impedance which enables easy cascading in the current mode circuits. The PSpice simulation results are depicted. The given results agree well with the theoretical anticipation. © 2013 IEEE.
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Electronically tunable current-mode biquad filter employing CCCDTAs and grounded capacitors with low input and high output impedance
(2013-12-01)
Jaikla, Winai
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Khateb, Fabian
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Siripongdee, Surapong
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Supavarasuwat, Piya
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Suwanjan, Peerawut
In this study, a single-input multiple-outputs current-mode analog biquadratic filter, based on current controlled current differencing transconductance amplifier (CCCDTA) is presented. The proposed filter uses two CCCDTAs and two grounded capacitors without any external resistors, which is well suited for integrated circuit implementation. The filter simultaneously gives 3 standard transfer functions, namely, lowpass, highpass and bandpass filters with independent control of quality factor and pole frequency by electronic method. By summing of I<inf>HP</inf> and L<inf>LP</inf>, the notch filter can be also achieved. Moreover, the circuit has low input and high output impedance which would be an ideal choice for cascading in current-mode circuit. The PSPICE simulation results are included verifying the workability of the proposed filter. The given results agree well with the theoretical anticipation. © 2013 Elsevier GmbH.
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Single-resistance-controlled current-mode quadrature sinusoidal oscillator using single CCCFTA with grounded elements
(2013-10-21)
Srisakultiew, Somchai
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Siripruchyanun, Montree
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Jaikla, Winai
This paper presents the current-mode quadrature sinusoidal oscillator employing current controlled current follower transconductance amplifier (CCCFTA). The proposed oscillator can provide two sinusoidal waveforms with high output impedance which makes the proposed oscillator can directly drive load or cascade in current mode circuit without any current buffers. The condition of oscillation (CO) and frequency of oscillation (FO) can be orthogonally controlled by mean of electronic tuning. The circuit consists of only single CCCFTA and three grounded passive elements which is ideal for implementation on an integrated circuit (IC) chip. The predicted results confirmed with Pspice simulation using a BJT technology are agreed with theoretical analysis. The total power consumption is approximately 1.28mW at ±2.5V power supply voltages. © 2013 IEEE.
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Current-mode quadrature oscillator based on CCCDTAs with noninteractive dual-current control for both condition of oscillation and frequency of oscillation
(2013-04-22)
Jantakun, Adirek
;
Jaikla, Winai
The realization of 2 current-mode quadrature oscillators using current-controlled current differencing transconductance amplifiers (CCCDTAs) and grounded capacitors is presented. The proposed oscillators can provide 2 sinusoidal output currents with a 90° phase difference. They enable noninteractive dual-current control for both the condition of oscillation and the frequency of oscillation. The high-output impedances of the configurations enable the circuit to be cascaded without additional current buffers. The use of only grounded capacitors is ideal for integration. The circuit performances are depicted through PSpice simulations; they show good agreement to theoretical. © Tübi·tak.
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Current-mode variable current gain first-order allpass filter employing CFTAs
(2013-01-01)
Iamarejin, Anirut
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Maneewan, Suwat
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Suwanjan, Peerawut
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Jaikla, Winai
In this study, a current-mode first order allpass filter using current follower transconductance amplifiers (CFTAs) is proposed. The features of the circuit are that: the pole frequency, phase response and current gain can be electronically controlled via the input bias current: the circuit description is very simple, consisting of 2 CFTAs, 1 resistor and 1 grounded capacitor, without any component matching requirements. Consequently, the proposed circuit is very appropriate to further develop into an integrated circuit. Low input and high output impedances of the proposed configuration enable the circuit to be cascaded in current-mode without additional current buffers. The PSpice simulation results are depicted. The given results agree well with the theoretical anticipation.

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