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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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Electronically tunable current-mode universal filter with three-input single-output
(2010-12-01)
Kumngern, Montree
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Torteanchai, Usa
;
Dejhan, Kobchai
A new current-controlled current-mode universal filter with three inputs and single output employing two translinear current conveyor and two grounded capacitors is presented. The proposed circuit provides low-pass, band-pass, high-pass, bandstop and all-pass current responses from the same configuration at a high impedance terminal. The filter also offers independent electronic control of the natural frequency and quality factor through adjusting the bias current of the translinear current conveyor. The characteristics of the proposed filter are simulated using PSPICE to confirm the theory. © 2010 IEEE.
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Electronically tunable current-mode multiphase oscillator using current-controlled cctas
(2010-12-01)
Kumngern, Montree
This paper presents a new current-mode multiphase sinusoidal oscillator employing current controlled current conveyor transconductance amplifiers (CCCCTAs). The proposed oscillator circuit, which employs one CCCCTA, one grounded capacitor and one grounded resistor for each phase, can generate arbitrary n output current equal-amplitude signals that are equally spaced in phase (n being even or odd), all at high output impedance terminals. The frequency of oscillation and the condition of oscillation can be controlled electronically and independently through adjusting the bias current of the CCCCTA. The proposed oscillator is highly suitable for integrated circuit implementation. The theoretical results were verified by PSPICE simulation. © 2010 IEEE.
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CMOS precision full-wave rectifier using current conveyor
(2010-12-01)
Kumngern, Montree
This paper presents a precision full-wave rectifier, which is highly suitable for CMOS technology implementation. The system comprises a voltage-to-current converter, precision full-wave rectifiers and a current-to-voltage converter. An input voltage signal is converted into two symmetrical current signals by using a dual-output second generation current conveyor. Two current signals will be rectified by using junction diodes and convert into output voltages by using grounded MOS resistors. Simulated rectifier results based on a 0.5μm CMOS technology demonstrates very high operating frequency and very precise rectification. © 2010 IEEE.
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Electronically tunable multiphase sinusoidal oscillator using translinear current conveyors
(2010-11-01)
Kumngern, Montree
;
Chanwutitum, Jirasak
;
Dejhan, Kobchai
A new electronically tunable current-mode multiphase sinusoidal oscillator based on translinear current conveyors is presented. The proposed oscillator circuit, which employs only one translinear current conveyor and one grounded capacitor for each phase, can generate arbitrary N output current equal-amplitude signals that are equally spaced in phase (N being even or odd), all at high output impedance terminals. The frequency of oscillation and the condition of oscillation can be controlled electronically and independently through the bias current of the translinear current conveyor. The proposed structure also has simple circuitry, low-component count, and is highly suitable for integrated circuit implementation. The theoretical results were verified by PSPICE simulation. In addition, the modification of the N sinusoidal oscillators to construct a programmable multiphase oscillator is also discussed. © 2010 Springer Science+Business Media, LLC.
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High frequency and high precision CMOS half-wave rectifier
(2010-10-01)
Kumngern, Montree
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Knobnob, Boonying
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Dejhan, Kobchai
In this paper, a new high frequency and high precision half-wave rectifier circuit which is very suitable for CMOS technology implementation is presented. The system comprises a voltage to current converter, a dual output precision current-mode half-wave rectifier, and two current to voltage converters. An input voltage signal is converted into a current signal by using a current conveyor and a MOS resistor. The current signal is rectified using a dual output class-AB precision rectifier cell and then converted into two output voltages by using grounded MOS resistors. This class-AB current-mode precision rectifier is employed for providing high frequency performance. Simulated rectifier results based-on a 0.5 μm CMOS technology with ±1.2 V supply voltage demonstrates very high operating frequency, very precise rectification and good temperature stability. © Springer Science+Business Media, LLC 2010. © Springer Science+Business Media, LLC 2010.
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Current-mode quadrature sinusoidal oscillator with current and voltage outputs
(2010-08-11)
Kumngern, Montree
A new current-mode quadrature oscillator, which provides both current and voltage outputs simultaneously is proposed. The proposed circuit employs two differential voltage current conveyors, two grounded capacitors and three grounded resistors. The condition oscillator and the frequency oscillation are orthogonally controllable. The proposed circuit can be made electronic control by using voltage-controlled differential voltage current conveyors. Simulation results verifying the theoretical analysis are also included. ©2010 IEEE.
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Electronically tunable current-mode quadrature oscillator using current differencing transconductance amplifiers
(2009-12-01)
Kumngern, Montree
;
Dejhan, Kobchai
A new electronically tunable single-element-controlled current-mode quadrature oscillator circuit using current differencing transconductance amplifiers (CDTAs) is presented. The proposed oscillator is consisted of two CDTAs, two grounded capacitors and one grounded resistor, which is beneficial to monolithic integrated circuit implementation. The oscillation condition and oscillation frequency of the circuit are independently controllable. Also, the oscillation frequency can be controlled by a bias current of CDTA. The realized of the circuit provides four quadrature current outputs at high output impedance nodes. PSPICE simulation results that confirm the theoretical predictions are given. © 2009 IEEE.
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Electronically tunable current-mode all-pass filter-based high-Q bandpass filter using minimum elements
(2009-12-01)
Kumngern, Montree
A new electronically tunable current-mode high-Q bandpass filter employing second-generation current controlled conveyor (CCCII)-based first-order all-pass filters is presented. The proposed filter uses only three CCCIIs, one current-controlled resistor and two grounded capacitors. The center frequency (ω<inf>c</inf>) and the quality factor (Q) can be independently adjusted through the bias current of the CCCII and current-controlled resistor. The Q-value is also temperature independent. The proposed configuration is very attractive for monolithic form. The performances of the proposed circuit are simulated with PSPICE to confirm the presented theory. ©2009 IEEE.
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Current conveyor-based versatile precision rectifier
(2008-12-01)
Kumngern, Montree
;
Dejhan, Kobchai
A versatile precision rectifier based on a current conveyor and current mirrors is presented. The proposed circuit performs positive half-wave, negative half-wave, positive full-wave, and negative full-wave rectification into a single circuit. The current-mode technique has been employed to provide the high-precision capability of the circuit. The circuit configuration is very suitable for integrated circuit implementation both in bipolar and CMOS technologies and it exhibits a precise rectifier and good temperature stability. Simulation results using the PSPICE program based on 0.5 μm CMOS parameter through MIETEC demonstrate the performance of the proposed rectifier. Experimental results are provided to confirm the theory.

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