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Design and Experimental Validation of the Versatile Voltage Conveyor-Based Novel Mixed-Mode Universal Filter Configurations and Quadrature Oscillator
(2025-01-01)
Faseehuddin, Mohammad
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Shireen, Sadia
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Channumsin, Orapin
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Bhanja, Mousumi
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Tangsrirat, Worapong
In this research, a truly mixed-mode multi-input single-output (MISO) universal filter is designed using a second-generation voltage conveyor (VCII) and an operational transconductance amplifier (OTA). The filter is designed with three VCIIs, three OTAs, two resistors and two grounded capacitors. It is capable of producing various responses including low-pass (LP), high-pass (HP), band-pass (BP), band-reject (BR) and all-pass (AP). The filter can also function in all four possible modes of operation: voltage mode (VM), current mode (CM), trans-admittance mode (TAM) and trans-impedance mode (TIM). The merits of the filter comprise (i) no requirement for matching passive component; (ii) use of grounded capacitors; (iii) low-output impedance in VM and TIM operations; (iv) high-output impedance in CM and TAM operations; and (v) the capacity to tune the quality factor (Q) and the natural angular frequency (ω<inf>o</inf>). A dual-mode quadrature oscillator is additionally derived from the proposed filter core. The condition for oscillation and the oscillation frequency can be regulated independently. Moreover, a novel VCII-exclusive mixed-mode filter topology is developed from the designed filter. A study is performed on the non-ideal gains and parasitic effects of the circuits. The designed filters and oscillators are validated in the Cadence design suite using a 0.18 μm real CMOS process. The filters are validated at a frequency of 1.59 MHz, and the oscillator is examined at 1.25 MHz at supply voltages of ±0.9 V. The mixed-mode filter has also been experimentally tested using commercial integrated circuits (ICs), specifically AD844 and LM13700. The theoretical results are found to exhibit a close correlation with the simulated ones.
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Novel Minimum Component Dual Mode Biquadratic SIMO Filter with Electronic Tunability
(2024-01-01)
Srivastava, Abhishek
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Prasad, Harishchandra
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Singh, Umesh
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Om Mishra, Shri
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Faseehuddin, Mohammad
Two topologies of minimum component single input multiple output (SIMO) filters are designed by employing a versatile active building block (ABB), the current conveyor transconductance amplifier (CCTA). The proposed filters work in current mode (CM) and trans-admittance mode (TAM). The CM SIMO filter is designed using two CCTA and two grounded capacitors. The CM filter can be converted to TAM filter just by adding a grounded resistor without any change in the topology. There is no need of passive component matching, and the filters provide all the five responses namely, high-pass (HP), band-pass (BP), low-pass (LP), all-pass (AP), and band-stop (BS) simultaneously. In addition, it provides an independent electronic tunability of angular frequency (ω) and quality factor (Q). The active and passive sensitivities of the filter parameters are low. In CM mode the filter offers low input impedances and high output impedances and in TAM mode the filter offers high input impedance and hight output impedance that support the cascadeability. The CM and TAM filters are designed for a frequency 16.23MHz and the simulation results employing 0.18 µm CMOS technology parameters at a supply voltage of ±1.25 V are obtained using Cadence software to validate the proposed design. Also, the proposed CM SIMO universal filter has been implemented in hardware to confirm its practicality. The commercially available integrated circuits (ICs), the current feedback operational amplifier (AD844) and operational transconductance amplifier (CA3080) and employed for the experimental validation.
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Three-Phase Oscillator with Cascade Ability Using Voltage Current Conveyor
(2024-01-01)
Buakaew, Seangrawee
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Narksarp, Wipavan
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Choeysombat, Kamonthip
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Kanjanawiwin, Juthamas
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Atiwongsangthong, Narin
This paper presents a new circuit configuration employing voltage current conveyors (VCII) in conjunction with a minimal number of passive elements to achieve a voltage mode sinusoidal oscillator with a 3 -phase differential output. The proposed circuit features a straightforward architecture, with all passive elements connected to low-impedance nodes. Consisting solely of identical VCIIs without multiple outputs, the circuit facilitates the cascading of the 3 -phase outputs without requiring supplementary buffering. Simulation results obtained through PSPICE, along with experimental validation using commercial ICs, are provided to substantiate the efficacy of the proposed circuit.
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Minimum Component Truly Mixed Mode First Order Universal Filter Employing EXCCTA
(2023-01-01)
Perumal, Srideviponmalar
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Faseehuddin, Mohammad
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Kukker, Amit
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Shireen, Sadia
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Tangsrirat, Worapong
A mixed mode first order universal filter (FO-UF) has been proposed in this study. One Extra X Current Conveyor Transconductance Amplifier (EXCCTA), one capacitor and two resistors are used to design the filter. The main attributes of the filter include (i) electronic tunability (ii) ability to work in all four modes of operation (iii) cascadability (iv) availability of low pass (LP), high pass (HP) and all pass (AP) responses simultaneously. By incorporating the filter to design the second order current mode and trans-admittance mode filters, the filter's practicability is investigated. To determine how component spread and frequency-dependent current and voltage transfer gains affect the filter's operation, non-ideal analysis is conducted. The layout of the EXCCTA occupies an area of 51.47*23.33μm2 and it is designed and validated using 180nm GPDK in Cadence software. The FO-UF functions at ±1.25V supply at a frequency of 16.23MHz. Experimental analysis using off the shelf integrated circuits (ICs), the AD844 and CA3080 is also conducted to validate the proposed design.
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Electronically Tunable Multifunction Current Mode Filter Employing Grounded Capacitors
(2022-12-01)
Fathima, Rani
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Perumal, Srideviponmalar
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Muniyappan, Vadivel
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Faseehuddin, Mohammad
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Tangsrirat, Worapong
In this paper, a new single input multi output (SIMO) filter is presented that works in current mode (CM). The universal filter is designed using a recently proposed highly versatile active building block the extra X current conveyor transconductance amplifier (EXCCTA). The design employs two EXCCTAs, two capacitors and one resistor. The designed filter uses grounded passive elements which is advantageous for fabrication. The design can provide all the five responses i.e., high-pass (HP), band-pass (BP), low-pass (LP), all-pass (AP), and band-stop (BS) simultaneously. In addition, it provides an independent electronic tunability of angular frequency (ω) and quality factor (Q). Moreover, there is no requirement of passive component matching. The non-ideal and sensitivity analysis of the filter is done to get a measure of the effect of the process and components variation on the functioning of the filter. The simulation results are obtained using Cadence software employing 0.18 μm CMOS technology parameters from Silterra Malaysia at a supply voltage of ±1.25 V also the layout of the EXCCTA is designed. The proposed filter is validated by designing it for a frequency of 16. 07MHz. Additionally, the Spice macro model of the commercially available integrated circuits (ICs) AD844 and LM13700 are used to further test the feasibility of the proposed filter.
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Electronically Adjustable Multiphase Sinusoidal Oscillator with High-Output Impedance at Output Current Nodes Using VDCCs
(2022-10-01)
Pitaksuttayaprot, Koson
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Phanrattanachai, Kritphon
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Jaikla, Winai
This paper presents the high-output-impedance current-mode multiphase sinusoidal oscillators (MSO) using voltage differencing current conveyor (VDCC)-based lossy integrators, which consist of one VDCC, one grounded capacitor, and two grounded resistors. The proposed oscillator can provide an odd-phase and even-phase system without the use of an additional amplifier. The frequency of oscillation (FO) is electronically tuned via the bias current without affecting the condition of oscillation (CO). The proposed oscillator is designed to obtain three-phase sinusoidal waveforms (n = 3). The effect of non-idealities of VDCC on the lossy integrator section is also investigated. The validity of the proposed circuit is demonstrated by PSPICE simulation using 0.18 µm TSMC CMOS process parameters with ±0.9V power supply. The frequency of oscillation obtained from the simulation is 1.43 MHz. The total harmonic distortions of the sinusoidal output currents I<inf>O1</inf>, I<inf>O2</inf>, and I<inf>O2</inf> are 1.22%, 1.18%, and 0.57%. The I<inf>O1</inf>–I<inf>O2</inf> and I<inf>O2</inf>–I<inf>O3</inf> phase differences are approximately 121 and 119 degrees, respectively. The feasibility of the proposed MSO is also verified with experimental results using the VDCC constructed from the commercially available ICs (LT1288 and AD844) with ±5 V power supply. The results of PSPICE simulations and experiments are closely consistent with the theoretical expectation.
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Ultra-low-power, modular, class-AB current multiplier
(2019-07-01)
Kongpoon, Metha
This paper describes a modular class-AB current multiplier which provides the good linearity, the linearly tunable conversion gain and the robustness to process mismatch. The proposed multiplier is derived from a hyperbolic sine multiplication identity, and was designed and simulated using 0.35 μm AMS CMOS process. Simulation results show that the improved linearity, linearly tunable conversion gain and better process variation robustness can be achieved while utilizing lower power consumption and the slightly higher number of transistors compared to the state-of-the-art class-AB current multiplier.
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Horizontal Magnetic Field MAGFET by Conventional MOSFET Structure
(2018-07-02)
Nakachai, Rattapong
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Poonsawat, Sawatdipong
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Sutthinet, Chalin
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Ruangphanit, Anucha
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Poyai, Amporn
The MOSFET used as magnetic field sensor is presented. It is a conventional structure that has a source, a gate, a drain and a substrate or body terminal which fabricated by standard CMOS process. It detects the horizontal y-direction magnetic field in parallel and perpendicular to currents. The device is biased for channel current and substrate current. The mechanism is Hall Effect in current mode. The induced Lorentz's force deflects currents between drain current and substrate forward current causes output differential current. The relation shows linearly dependence between magnetic field density and output differential current. The relative sensitivity depends on amount of bias currents.
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Realization of tunable elliptic low-pass filter based on CCCIIs
(2016-03-11)
Kunto, Terdsak
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Prommee, Pipat
This article presents a realization of electronically tunable current-mode Elliptic ladder low-pass filter using CCCIIs. The passive RLC ladder filters prototype and signal flow graph method (SFG) are employed for synthesis. The CCCII-based lossy, lossless integrators and current attenuator are required for the circuit realization. The proposed filter circuit can be electronically tuned between 1 kHz and 1 MHz through bias current from 0.05μA to 50μA. The proposed filter use ±1.5V power supply with 6 mW power consumption at 50 μA bias current. The proposed filter uses grounded capacitors without external resistors which is suitable for further integration. The total harmonic distortion (THD) of the low-pass filters is less than 0.5% over the operating frequency range. PSPICE simulation results are carried out, obtained by using BJT model parameter of HFA 3046, confirm the presented theory.
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Amplitude controllable current-mode first order allpass filter including minimum component count circuits
(2015-10-09)
Chaichana, Amornchai
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Kumngern, Montree
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Siripruchyanun, Montree
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Jaikla, Winai
This paper presents a current-mode first order allpass filter based on current follower cascaded transconductance (CFCTA). The phase shifted angle and amplitude of output currents can be electronically and independently tuned via the bias current. The proposed circuit uses only one CFCTA and one grounded capacitor and one electronic resistor, which is definitely suitable to further develop into an integrated circuit. It can provide both non-inverting and inverting output currents. Moreover, the circuit possesses low input and high output impedance, providing easy cascading in current-mode circuit. The PSPICE simulation results based on 0.25μm TSMC CMOS parameters are included, verifying the key characteristics of the presented filter. The given results agree well with the theoretical presumptions. The power consumption is about 5.5mW.

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