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Author: search.filters.author.Tangsrirat, WorapongSubject: search.filters.subject.current mode

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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
    ;
    Shireen, Sadia
    ;
    Channumsin, Orapin
    ;
    Bhanja, Mousumi
    ;
    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
    ;
    Prasad, Harishchandra
    ;
    Singh, Umesh
    ;
    Om Mishra, Shri
    ;
    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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    Minimum Component Truly Mixed Mode First Order Universal Filter Employing EXCCTA
    (2023-01-01)
    Perumal, Srideviponmalar
    ;
    Faseehuddin, Mohammad
    ;
    Kukker, Amit
    ;
    Shireen, Sadia
    ;
    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
    ;
    Perumal, Srideviponmalar
    ;
    Muniyappan, Vadivel
    ;
    Faseehuddin, Mohammad
    ;
    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.