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CFTA-based electroniccally tunable quadrature sinusoidal oscillator
(2014-10-15)
Kumngern, Montree
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Lamun, Panit
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Junnapiya, Somyot
This paper presents a new electronically tunable current-mode quadrature sinusoidal oscillator. The proposed oscillator employs only two current follower transconductance amplifiers, one virtually grounded resistor and two grounded capacitors which is advantageous for integrated circuit implementation. The proposed circuit offers the advantages of orthogonal electronic setting for the frequency of oscillation and condition of oscillation, availability of two explicit quadrature current outputs and low sensitivity properties. The outputs of the circuit possess high impedance level which is directly connected to the loads without buffer circuits. PSPICE simulation and experimental results are used to verify the workability of the proposed circuit.
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ECCCII-based current-mode universal filter with orthogonal control of ωo and Q
(2014-01-01)
Kumngern, Montree
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Khateb, Fabian
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Phasukkit, Pattarapong
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Tungjitkusolmun, Supan
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Junnapiya, Somyot
This paper presents a new current-mode current- controlled four-input five-output universal filter employing one current-controlled current conveyor (CCCII), one electronically tunable CCCII and two grounded capacitors. The proposed configuration provides lowpass, bandpass, highpass, bandstop and allpass current responses that taken from the high-output impedance terminals, which enable easy cascadability of the current-mode operation. The filter also offers both orthogonal and electronic controls of the natural frequency and the quality factor through adjusting the bias current of the CCCIIs. For realizing all the filter responses, the proposed filter does not require passive component-matching condition and both active and passive sensitivities are low. In addition, a new current-mode current-controlled single-input five-output universal filter can be achieved by using an additional multiple-output minus-type CCCII. The proposed filter is simulated using PSPICE simulations to confirm the theoretical analysis.
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A CMOS four-quadrant current multiplier using electronically tunable CCII
(2013-12-01)
Kumngern, Montree
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Junnapiya, Somyot
This paper presents a new analogue four-quadrant current multiplier using electronically tunable second-generation current conveyor. The proposed structure is highly suitable for implementation in low cost technology as CMOS technology. PSPICE simulators using the 0.5 μm CMOS parameters are performed to confirm the workability of the proposed structure. The simulation results show that the proposed multiplier yields excellent temperature stability and good analogue multiplication. © 2013 IEEE.
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Tunable voltage-mode multifunction biquadratic filter with three inputs single output using three single-ended OTAs and two capacitors
(2013-05-20)
Kumngern, Montree
;
Junnapiya, Somyot
This paper presents a electronically tunable voltagemode universal biquadratic filter with three inputs and one output using three single-ended operational transconductance amplifiers and two capacitors. The proposed filter provides low-pass, band-pass, high-pass, band-stop and all-pass filters by appropriately connecting the input terminals. No component-matching condition is required for realizing these filtering functions. The use of minimum elements makes the filter possible for low power consumption applications. The natural frequency and the quality factor can be set orthogonally by adjusting the circuit components. Also the natural frequency can be electronically tuned via the bias currents of OTAs. The performances of the proposed circuit are simulated with PSPICE to confirm the presented theory. © 2013 IEEE.
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Voltage-mode lowpass, highpass, bandpass biquadratic filter using OTRAs
(2013-01-01)
Kumngern, Montree
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Junnapiya, Somyot
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Chanwutitum, Jirasak
This paper presents a new voltage-mode universal biquadratic filter using operational transresistance amplifiers as active building block. The proposed circuit offers the following attractive advantages: realization of highpass, bandpass, lowpass filters, simultaneously, from the same circuit, no requirements for component-matching conditions for realizing all filtering function, low active and passive components. The workability of the proposed filter has been confirmed by PSPICE simulators. © 2013 IEEE.
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Voltage-mode allpass section employing only one DDCCTA and one capacitor
(2013-01-01)
Kumngern, Montree
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Mongkol, Vittawat
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Junnapiya, Somyot
This paper presents a voltage-mode allpass section employing only one differential difference current conveyor transconductance amplifier (DDCCTA) and one capacitor. The pole frequency of the filter can be controlled electronically by the transconductance value via adjusting the bias current of the DDCCTA. For realize filtering function, no component-matching conditions are needed. Simulation results using TSMC 0.35 μm CMOS process are performed to examine the proposed circuit. From simulation results, the proposed filter offers agree well with the proposed theory. © 2013 IEEE.
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Three-input single-output current-mode universal filter using a MCDTA
(2013-01-01)
Kumngern, Montree
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Khwama, Kulasak
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Junnapiya, Somyot
This paper presents a new three inputs and one output current-mode universal filter employing one modified current differencing transconductance amplifier (MCDTA) and two grounded capacitors. The filter can realize low-pass, bandpass, high-pass, band-stop and all-pass responses by appropriately connecting the input terminals. For realize filtering functions, without component-matching conditions and inverting-type input signal requirements. The natural frequency can be electronically controlled by the bias currents of MCDTA. The active and passive sensitivity of the filter are low. The PSPICE simulation results are performed to confirm the presented theory. © 2013 IEEE.
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One-input five-output voltage-mode universal biquadratic filter using single-ended OTAs
(2012-11-22)
Kumngern, Montree
;
Junnapiya, Somyot
This paper presents a new high-input impedance electronically tunable voltage-mode universal filter with one input and five outputs employing eight single-ended operational transconductance amplifiers and two grounded capacitors. The proposed circuit can simultaneously realize voltage-mode low-pass, band-pass, high-pass, band-stop and all-pass filter without inverting-type input signals and component-matching conditions requirements. The natural frequency and the quality factor can be orthogonally controlled. The natural frequency can also be electronically tuned. The active and passive sensitivities of the circuit are low. Simulation results are provided to demonstrate the theoretical analysis. © 2012 IEEE.
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Tunable quadrature sinusoidal oscillator using single-ended OTAs
(2012-10-17)
Kumngern, Montree
;
Junnapiya, Somyot
This paper presents a new electronically tunable voltage-mode quadrature sinusoidal oscillator employing four single-ended operational transconductance amplifiers (OTAs) and two grounded capacitors. In general, the single-ended OTA configuration is simpler than the multiple-output OTA counterpart and the requirement of grounded capacitors is preferable for an integrated circuit fabrication process. Therefore, the proposed circuit provides a simple circuitry by using only single-ended OTA and highly suitable for integrated circuit (IC) implementation by using grounded capacitors. The condition of oscillation and the frequency of oscillation of the circuit can be set orthogonally. The circuit also offers an electronic control of the frequency of oscillation through adjusting the bias currents of OTAs. The theoretical results are verified by PSPICE simulators. From simulation results, it can be expressed that the proposed circuit agrees well with theory. © 2012 IEEE.
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Mixed-mode universal filter using OTAs
(2012-01-01)
Kumngern, Montree
;
Junnapiya, Somyot
This paper presents an electronically tunable versatile biquadratic filter. Unlike the typical voltage-mode and current-mode filter, the proposed filter can realize voltage-mode, current-mode, transconductance-mode and transresistance-mode transfer functions without changing the circuit topology, called a mixedmode filter. The proposed structure employs six operational transconductance amplifiers, two grounded capacitors and one external resistor that provides following advantages: realization of low-pass, band-pass, high-pass, band-stop and all-pass filter responses; orthogonal control of the natural frequency and the quality factor; employment of grounded capacitors which is more suitable for integrated circuit implementation; low active and passive sensitivities. Simulation results are also given to confirm the presented theory. © 2012 IEEE.

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