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Truly Mixed-Mode Universal Filter Capable of Operation in MISO and SIMO Configurations with Quadrature Oscillator as an Application
(2026-01-01)
Faseehuddin, Mohammad
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Sivagami, P.
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Shireen, Sadia
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Tangsrirat, Worapong
A versatile mixed-mode universal filter with electronic tunability is proposed in this research. The filter employs a modified differential voltage current conveyor transconductance amplifier (M-DVCCTA) as the active block. Without modifying the circuit topology, the mixed mode filter operates in single input multi-output (SIMO) and multi input single output (MISO) configurations. In addition, as an application the proposed filter is configured as a dual-mode quadrature oscillator. The designed filter can implement all five generic filter functions in voltage-mode (VM), current-mode (CM), transimpedance-mode (TIM), and transadmittance-mode (TAM). The filter design requires two M-DVCCTAs, two grounded capacitors and three resistors for implementation. To obtain VM and TIM outputs in SIMO configuration, three extra resistors are necessary. All the resistors used are active MOSFET-based resistors with variable resistance. The parasitic, non-ideal gain, and sensitivity analysis are conducted to gauge the effects of process variations and passive components spread on the filter performance. The circuit implementation and layout design of the M-DVCCTA is done in Cadence Virtuoso using 0.18-µm GPDK. The M-DVCCTA occupies an area of 63.71 * 45.66 µm<sup>2</sup>. The filters and oscillator are tested at a frequency of 3.98 MHz at ± 0.9 V supply voltage. The Monte Carlo analysis, processes corner analysis and total harmonic distortion analysis are performed to examine the robustness of the proposed designs. The simulation and theoretical results show good correlation.
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Operational frequency bandwidth rescalable implementations of constant phase devices
(2019-04-01)
Sotner, Roman
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Jerabek, Jan
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Langhammer, Lukas
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Polak, Ladislav
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Jaikla, Winai
This paper presents and verifies a method for rescalability of operational bandwidth in constant phase devices (two-port elements, two-port transfer blocks). Most importantly, in comparison with a standard approach, it allows to utilize suitable values of capacitance in the case of operation at low-frequency bands. The capacitance multipliers based on a controllable variable gain amplifier are implemented in examples of simple fractional-order systems (two-port integrators). These examples consist of novel bilinear immittances with independently settable zero and pole frequency coordinates, based on widespread commercially available current conveyors of second generation. The capacitance multiplier extends features of the bilinear immittance and full implementation of the system. PSpice simulations, using off-the-shelf elements, confirm operability of the proposed concept.
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Exponentially tunable voltage controlled quadrature oscillator
(2017-10-19)
Sotner, Roman
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Jerabek, Jan
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Petrzela, Jiri
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Domansky, Ondrej
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Jaikla, Winai
This paper deals with appropriate method of tunability extension in quadrature oscillators. Exponential dependence of frequency of oscillations on DC control voltage is created in lossless integrators by utilization of two exponentially controlled variable gain amplifiers and diamond transistors. Proposed solution maintains all beneficial features (especially independent levels of output waveforms on tuning process) of the oscillator concept employing two lossless integrators in the single loop and electronically controllable negative resistor serving for adjusting of condition of oscillations. PSpice verifications based on simulations of macromodels of used active devices confirmed doubled tunability range in comparison to standard linear control of frequency obtained for the same change of DC driving voltage.
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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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Dual slope analog-to-digital converter using simple CCII-based integrator
(2010-10-01)
Smerpitak, Krit
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Julsereewong, Amphawan
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Sasaki, Horofumi
This article presents a dual slope analog-to-digital converter (ADC) using second generation current conveyor (CCII)-based integrator. In comparison with the previously reported dual slope ADCs with grounded capacitor, the proposed configuration offers simpler structure and fewer components while utilizing the positive reference voltage. Experimental results are given to confirm the operation of the proposed ADC. ICIC International © 2010 ISSN.
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Interface circuit for single active element resistive sensors
(2010-10-01)
Julsereewong, Amphawan
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Julsereewong, Prasit
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Rungkhum, Tipparat
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Sasaki, Hirofumi
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Isoguchi, Hiroshi
This article presents an effective method to realize interface circuit for single active element resistive sensors. The realization is composed of op-amp in conjunction with current conveyors. Surpassing the previous circuit using only single current conveyor, the proposed configuration affords significant improvement in accuracy. PSPICE simulation results are used to confirm the performance of the proposed circuit. © 2010 ICIC International.
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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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Current conveyor-based versatile precision rectifier
(2008-12-01)
Kumngern, Montree
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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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A simple 1.5 v rail-to-rail CMOS current conveyor
(2007-08-01)
Kasemsuwan, Varakorn
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Nakhlo, Weerachai
A simple 1.5 V rail-to-rail CMOS current conveyor is presented. The circuit is developed based on a complementary source follower with a common-source output stage. The circuit is designed using a 0.13 μm CMOS technology and HSPICE is used to verify the circuit performance. The current conveyor exhibits low impedance at terminal X (7.2 Ω) and can drive ±0.6 V to the 300 Ω with the total harmonic distortion of 0.55% at the operating frequency of 3 MHz. The voltage transfer error (between the Y and X terminals) and current transfer error (between the X and Y terminals) are small (-0.2dB). The power dissipation and bandwidth are 532 μW and over 300 MHz, respectively. © World Scientific Publishing Company.

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