Design of CDTA and VDTA Based Frequency Agile Filters

Pandey, Neeta; Sayal, Aseem; Choudhary, Richa; Pandey, Rajeshwari

doi:10.1155/2014/176243

Cited by 19 publications

(13 citation statements)

References 19 publications

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“…A large diversity of SIMO filters are reported [1][2][3][4]. Filter topologies [1][2][3][4] are non-shadow (NS) type, while filter topologies [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] are shadow (S) type. Further, [29][30][31][32][33][34][35] are current-mode (CM) types and [36][37][38][39][40][41][42][43] are voltage-mode (VM) types.…”

Section: Introductionmentioning

confidence: 99%

Improved Current Mode Biquadratic Shadow Universal Filte

2022

Informacije MIDEM

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In this paper, an improved single-input-multiple-output (SIMO) current-mode biquadratic shadow universal filter (SUF) is realized using two new variants of second-generation current conveyors (CCIIs), namely current conveyor cascaded transconductance amplifier (CCCTA) and extra-X current controlled conveyor transconductance amplifier (EX-CCCTA). The low pass and the band pass outputs of a non-shadow universal filter (NSUF), consisting of CCCTA, are utilized through two amplifiers' feedback paths using one EX-CCCTA to realize the proposed SUF. It is resistorless and utilizes only two grounded capacitors. All the five standard responses of SUF, such as low pass (LP), high pass (HP), band pass (BP), band-reject (BR), and all pass (AP), are obtained simultaneously. The main advantage of SUF over NSUF is the ease of orthogonal tuning of the pole frequency (ω o ) and quality factor (Q o ) with the bias currents of CCCTA and EX-CCCTA. It is suitable for full cascadability because of proper input and output impedances. Moreover, it simplifies integrated circuit implementation because all capacitors are grounded and no resistors are required. It does not possess any component matching constraints and consumes 4.1mW of power. The theoretical results have been validated in TSMC 180nm technology using Cadence Virtuoso.

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Section: Introductionmentioning

confidence: 99%

Improved Current Mode Biquadratic Shadow Universal Filte

2022

Informacije MIDEM

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“…Practical applications of current-mode CCCII-based shadow filters of different classes were presented in [5]- [8]. In [9] and [10] current-mode shadow filters using the current difference transconductance amplifier (CDTA) and the voltage difference transconductance amplifier (VDTA) of different classes are presented. Unfortunately the CCCII+, the CDTA, the VDTA and the ZC-CITA active elements used in [1]- [3] and [5]- [11] are not commercially available integrated circuits.…”

Section: Introductionmentioning

confidence: 99%

New voltage-mode bandpass shadow filter

Abuelma’atti

Almutairi

2016

2016 13th International Multi-Conference on Systems, Signals &Amp; Devices (SSD)

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A new voltage-mode bandpass shadow filter is presented. The filter is built around the current-feedback operational-amplifier. The parameters of the filter can be controlled by adjusting the gains of external amplifiers built around the current-feedback operational-amplifier. Contrary to the conjecture based on the current-mode shadow filter realization where a summing junction must be used, no summing amplifiers are used in this voltagemode realization. Experimental results obtained using the AD844 current-feedback operational-amplifier are presented. The results obtained confirm the functionality of the proposed circuit.Index Terms-Shadow filter, bandpass filter, current feedback operational amplifier

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“…Moreover, architectures' parameters can be still modified in order to be able to adapt to the specifications of different protocols and standards [5]- [7]. Only limited number of FAF topologies using active building blocks (ABBs) working in currentmode (CM) exist in open literature [2], [8]- [10]. It is known that CM circuits show some advantages against voltagemode circuits such as inherent wider bandwidth, simpler circuitry, lower power consumption, and wider dynamic range [11].…”

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confidence: 99%

“…In [8], in order to obtain a CM class 1 FAF, the basic class 0 filter employing two current differencing transconductance amplifiers (CDTAs) and two capacitors is extended with electronically controllable second-generation current conveyor (ECCII) functions as amplifier A. In CDTA-based class 1 FAF [9], the gm sub-block of the 2 nd CDTA is used for frequency hoping while in [10] additional operational transconductance amplifiers are used as amplifier subcircuits. Moreover, reference [10] also introduces both class 1 and class 2 FAFs employing recently introduced voltage differencing transconductance amplifiers (VDTAs) [12], [13].…”

mentioning

confidence: 99%

“…In CDTA-based class 1 FAF [9], the gm sub-block of the 2 nd CDTA is used for frequency hoping while in [10] additional operational transconductance amplifiers are used as amplifier subcircuits. Moreover, reference [10] also introduces both class 1 and class 2 FAFs employing recently introduced voltage differencing transconductance amplifiers (VDTAs) [12], [13].…”

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confidence: 99%

See 1 more Smart Citation

New Current-Mode Class 1 Frequency-Agile Filter for Multi Protocol GPS Application

Atasoyu¹,

Metin²,

Kuntman³

et al. 2015

ElAEE

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Recently, due to their cost, accuracy, and integrability of conventional current-mode (CM) on-chip integrated filters working in radio frequency region, frequency-agile filters (FAFs) have started taking great interest in multi-standard transceivers, encrypted communication, cognitive radio, software defined radio structures, and global positioning system applications. By following the most recent trend in the literature, this paper proposes the first class 1 CM FAF using high-performance analog building block so-called positive-type electronically controllable second-generation current conveyor (ECCII+), two resistors, and two grounded capacitors. The theory and the proposed 2 nd-order CM FAF are supported by both regular and post-layout simulations performed using CADENCE Spectre tool with TSMC 0.18 µm level-49 CMOS technology process BSIM3v3 parameters. Furthermore, corner and Monte-Carlo analyses are given to prove the accuracy of centre frequency of the CM FAF.

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Design of CDTA and VDTA Based Frequency Agile Filters

Cited by 19 publications

References 19 publications

Improved Current Mode Biquadratic Shadow Universal Filte

Improved Current Mode Biquadratic Shadow Universal Filte

New voltage-mode bandpass shadow filter

New Current-Mode Class 1 Frequency-Agile Filter for Multi Protocol GPS Application

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