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A Novel Multiple-Input Single-Output Current-Mode Shadow Filter and Shadow Oscillator Using Current-Controlled Current Conveyors
(2024-09-01)
Kumngern, Montree
;
Khateb, Fabian
;
Kulej, Tomasz
This paper presents a novel multiple-input single-output current-mode shadow filter and oscillator using current-controlled current conveyors (CCCIIs). The CCCII current gains are used to set the filter’s quality factor and natural frequency. The filter is resistorless with grounded capacitors, making it more suitable for integration. The filter offers low-pass, high-pass, band-pass, band-stop and all-pass transfer functions in a single topology by appropriately applying the input signals. To validate the functionality of the new topology, the proposed circuit is simulated by SPICE using bipolar transistors arrays AT&T ALA400-CBIC-R.
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Current-mode universal filter and quadrature oscillator using current controlled current follower transconductance amplifiers
(2019-08-15)
Kumngern, Montree
;
Khateb, Fabian
This paper presents a new current-mode quadrature oscillator and universal filter that employs two current controlled current follower transconductance amplifiers and two grounded capacitors. The proposed circuit can be realized either as a quadrature oscillator or as a universal filter without changing circuit topology. In case the circuit works as a quadrature oscillator, the condition and the frequency of oscillation can be independently and electronically controlled. Four-phase quadrature current outputs and two-phase quadrature voltage outputs can also be obtained. In case the circuit works as a universal filter, low-pass, high-pass, band-pass, band-stop and all-pass filtering functions can be obtained simultaneously by appropriately selecting the input and output signals. The natural frequency and the quality factor of filter can also be obtained independently and electronically. PSPICE simulation results are used to verify the workability of the new topology.
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Electronically tunable current-mode multifunction filter using current-controlled current follower transconductance amplifier
(2019-01-01)
Kumngern, Montree
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Khateb, Fabian
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Prommee, Pipat
;
Jaikla, Winai
A new electronically tunable current-mode multifunction universal filter with three inputs and one output based on current-controlled current follower transconductance amplifier is presented. The proposed filter can implement low-pass, band-pass, high-pass, band-stop and all-pass transfer functions with a single topology. For implementation of these transfer functions, no passive component-matching conditions, no inverted input signal requirements and high-output impedance are required. Also the proposed filter offers electronic control of the natural angular frequency, low active and passive sensitivities and use of grounded capacitors which is ideal for integrated circuit implementation. The proposed universal biquadratic filter has been used for implementing sixth-order filters. PSPICE simulation results confirm the presented theory.
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Quadrature oscillator and universal filter based on translinear current conveyors
(2018-09-01)
Kumngern, Montree
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Wareechol, Eakluck
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Phasukkit, Pattarapong
This paper presents quadrature oscillator and universal filter based on translinear current conveyors. The proposed circuit can realize as a quadrature oscillator or a universal filter without changing the circuit topology. When it works as a quadrature oscillator, four quadrature current outputs and two quadrature voltage outputs can be obtained. The condition and frequency of oscillation of oscillator can be controlled orthogonally and electronically. When it works as a universal filter, low-pass, band-pass, high-stop, band-stop, and all-pass filtering functions can be obtained simultaneously. The natural frequency and quality factor of filters can be controlled orthogonally and electronically. The proposed topology is simulated using PSPICE simulators and experimental results are also used to confirm workability of new circuit.
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Quadrature oscillator/universal filter using CCCII with adjustable gain
(2018-07-02)
Wareechol, Eakluck
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Kumngern, Montree
;
Torteanchai, Usa
This paper presents a quadrature oscillator and universal filter using current controlled current conveyor with adjustable gain as active element. The proposed circuit combines a quadrature oscillator and a universal filter without changing the topology. In the case that the circuit works as a quadrature oscillator, two quadrature voltage outputs and four quadrature current outputs can be obtained. The condition of oscillation and frequency of oscillation can be orthogonally controlled. In the case that the circuit works as a universal filter, low-pass, band-pass, high-stop, band-stop, and all-pass filtering functions can be obtained. The natural frequency and quality factor of filters can be electronically controlled. The proposed topology is simulated using PSPICE simulators to confirm the workability of the new circuit.
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OTA-Based current square-rooting circuit
(2017-02-01)
Kumngern, Montree
;
Torteanchai, Usa
This paper presents a new simple current-mode square-rooting circuit based on CMOS technology. The proposed circuit consists of only one CMOS operational transconductance amplifier (OTA) with source degeneration and one MOS transistor. The input signal of the circuit is a current and the output is a current proportional to the square root of the input current with high-output impedance level. OTA with source degeneration is used to provide wide input dynamic range. The circuit also exhibits wide bandwidth and good temperature stability. PSPICE simulation results are used to demonstrate the performance of the proposed square-rooting 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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Current-mode quadrature oscillator using current differencing transconductance amplifiers
(2012-07-01)
Kumngern, Montree
;
Lamun, Panit
;
Dejhan, Kobchai
This article presents a new electronically tunable single-element-controlled current-mode quadrature sinusoidal oscillator circuit using current differencing transconductance amplifiers (CDTAs). The proposed oscillator is consisted of two CDTAs, two grounded capacitors and one grounded resistor, which is beneficial to monolithic integrated circuit implementation both in CMOS and bipolar technologies. The condition of oscillation and the frequency of oscillation are independently controllable. The frequency of oscillation can also be electronically controlled by adjusting the bias current of CDTA. The circuit provides four quadrature current outputs and two quadrature voltage outputs. The current output terminals possess high impedance level. PSPICE simulation results are used to verify the performance of the proposed circuit implemented at the transistor level. The measurement results support the computer simulations.
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A current-mode four-phase third-order quadrature oscillator using a MCCCFTA
(2012-01-01)
Kumngern, Montree
;
Torteanchai, Usa
This paper presents a new current-controlled current-mode third-order quadrature oscillator. The proposed circuit employs only one modified current-controlled current follower transconductance amplifier (MCCCFTA) and three grounded capacitors which is highly suitable for integrated circuit implementation. Also four quadrature current output terminals possess high impedance level which can be directly connected to the next stage without additional follower circuits. The condition of oscillation and the frequency of oscillation can be controlled orthogonally and electronically by adjusting the biasing currents of the MCCCCFTA. Simulation results verifying the theoretical analysis are included. © 2012 IEEE.
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Current-mode multifunction biquadratic filter using a single MCCCDTA
(2012-01-01)
Kumngern, Montree
This paper presents a new current-tunable current-mode universal biquadratic filter with two inputs and two outputs using one modified current-controlled current differencing transconductance amplifier, two grounded capacitors and one grounded resistor. The proposed circuit provides following advantages: realization of lowpass, bandpass, highpass, bandstop and allpass current responses; orthogonal control of the natural frequency and the quality factor; employment of grounded passive components which is very 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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