Reconfigurable CNTFET based fully differential first order multifunctional filter

Masud, Muhammad I.; A’ain, Abu Khari; Khan, Iqbal A.

doi:10.1109/mspct.2017.8363973

Cited by 13 publications

(20 citation statements)

References 11 publications

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“…From Table 1, the following may be noted: The circuits of previous works 2,29–43 use more than one ABB, two ABBs 2,29–42 and three ABBs, 43 and, hence, do not belong to the class of single‐ABB‐based first‐order UAFs to which the circuits proposed in this article belong to. The single‐ABB‐based earlier works 3,10,12–14 use only a single ABB but realize a UAF only in CM, whereas other studies, 16–27 too, use only one ABB but realize an UAF only in VM. On the other hand, the single ABB configuration of Chaturvedi and Kumar 11 is in CM/TAM mode, whereas single ABB configuration of Maheshwari et al 15 and Singh et al 24 are in VM/TAM mode. None of the building blocks employed in previous works 3–24,26,27 are yet available as off‐the‐shelf ICs. The circuits of previous studies 5,14,20–22,24–27 do not employ a grounded capacitor. The UAFs in previous works, 5,16–19,21,23–25,27 do not have the appropriate Z in or Z out to enable cascadability. The only other earlier work which is based upon the use of a commercially available IC (namely, the LT1228 comprising an OTA followed by a CFOA) also realizes only VM UAF and does not employ a grounded capacitor. …”

Section: Introductionmentioning

confidence: 95%

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CFOA‐based simple mixed‐mode first‐order universal filter configurations

Bhaskar

Raj

Senani

et al. 2022

Circuit Theory & Apps

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This brief communication presents two current feedback op-amp (CFOA)based simple first-order mixed-mode universal filter topologies-one of them providing first-order low-pass (LP), high pass (HP), and all pass (AP)-all the three filters in voltage-mode (VM)/trans-admittance-mode (TAM) while the other one realizing the quoted three functions in current-mode (CM)/transimpedance-mode (TIM). Except the all pass filter realization from the first configuration which needs a second CFOA also as gain-of-two amplifier, in all the remaining cases of both the configurations, only a single CFOA is needed. The other notable features of the circuits are employment of only three resistors and a grounded capacitor (as preferred for IC implementation) and the availability of independent tunability of the gain (H 0 ) and cut-off frequency/pole frequency (ω 0 ) of all the three filters, in both the cases. In spite of not offering ideally infinite input impedance in VM/TAM mode and ideally zero input impedance in CM/TIM mode, the circuits still possess easy cascadability due to providing a voltage output from a low-output impedance terminal W while the current output from the high output impedance terminal Z. Non-ideal and sensitivity analyses have also been carried out. The workability of the proposed circuits has been demonstrated through PSPICE simulations and experimental results using the commercially available AD844-type IC CFOA.

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Section: Introductionmentioning

confidence: 95%

“…A brief overview of earlier published first‐order UAFs is now in order. However, in order to keep the overview of the earlier works 2–43 as brief as possible, we have compiled the relevant data in tabular form as shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

CFOA‐based simple mixed‐mode first‐order universal filter configurations

Bhaskar

Raj

Senani

et al. 2022

Circuit Theory & Apps

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“…where, e is the unit-electron-charge and a is the graphene-lattice-constant with a value of 2.49A • . V π is the π to π bond-energy in tight-bonding-model with a value of 3.033 eV [30]. CNFET is one of the most attractive applications of CNT, which is obtained by replacing the MOSFET channel with one or more single-wall semiconducting CNTs as a channel material, as shown in Figure 1.…”

Section: Carbon Nano-tube Field Effect Transistormentioning

confidence: 99%

“…These outstanding features make the CNFET a potential candidate for future high-frequency analog circuit applications. Since CNFET introduction as an alternative to MOSFET, limited studies on CNFET-based analog filter design have been carried out [28][29][30][31][32][33][34][35][36].In this paper, a new VM SE CNFET-only APF is proposed. The realized APF has a very compact circuit structure and it is free from external passive capacitors and resistors.…”

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confidence: 99%

Design of Voltage Mode Electronically Tunable First Order All Pass Filter in ±0.7 V 16 nm CNFET Technology

et al. 2019

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A novel voltage mode first order active only tuneable all pass filter (AOTAPF) circuit configuration is presented. The AOTAPF has been designed using ±0.7 V, 16 nm carbon nanotube field effect transistor (CNFET) Technology. The circuit uses CNFET based varactor and unity gain inverting amplifier (UGIA). The presented AOTAPF is realized with three N-type CNFETs and without any external passive components. It is to be noted that the realized circuit uses only two CNFETs between its supply-rails and thus, suitable for low-voltage operation. The electronic tunability is achieved by varying the voltage controlled capacitance of the employed CNFET varactor. By altering the varactor tuning voltage, a wide tunable range of pole frequency between 34.2 GHz to 56.9 GHz is achieved. The proposed circuit does not need any matching constraint and is suitable for multi-GHz frequency applications. The presented AOTAPF performance is substantiated with HSPICE simulation program for 16 nm technology-node, using the well-known Stanford CNFET model. AOTAPF simulation results verify the theory for a wide frequency-range.

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“…Compared to "true" fully-differential circuits, whose circuit topology is also fully differential (e.g. [46] - [51]), the pseudodifferential structures as presented e.g. in [52] - [62] also provide the advantages of higher ability to reject the commonmode noise signals, suppress power supply noise, or feature higher dynamic range together with reduced harmonic distortion of the processed signal.…”

Section: Introductionmentioning

confidence: 99%

Pseudo-Differential (2 + α)-Order Butterworth Frequency Filter

et al. 2021

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This paper describes the design of analog pseudo-differential fractional frequency filter with the order of (2 + α), where 0 < α < 1. The filter operates in a mixed-transadmittance mode (voltage input, current output) and provides a low-pass frequency response according to Butterworth approximation. General formulas to determine the required transfer function coefficients for desired value of fractional order α are also introduced. The designed filter provides the beneficial features of fully-differential solutions but with a less complex circuit topology. It is canonical, i.e. employs minimum number of passive elements, whereas all are grounded, and current conveyors as active elements. The proposed structure offers high input impedance, high output impedance, and high common-mode rejection ratio. By simple modification, voltage response can also be obtained. The performance of the proposed frequency filter is verified both by simulations and experimental measurements proving the validity of theory and the advantageous features of the filter.

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Reconfigurable CNTFET based fully differential first order multifunctional filter

Cited by 13 publications

References 11 publications

CFOA‐based simple mixed‐mode first‐order universal filter configurations

CFOA‐based simple mixed‐mode first‐order universal filter configurations

Design of Voltage Mode Electronically Tunable First Order All Pass Filter in ±0.7 V 16 nm CNFET Technology

Pseudo-Differential (2 + α)-Order Butterworth Frequency Filter

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