Realizations of lossy and lossless capacitance multiplier using CFOAs

Özer, Emre; Başak, Muhammed Emin; Kaçar, Fırat

doi:10.1016/j.aeue.2020.153444

Cited by 21 publications

(10 citation statements)

References 37 publications

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“…Though CFOAs were initially proposed to work in conditions similar to OAs with two input terminals and a single output, 12,13 the availability of the compensation node adds flexibility to the topology, allowing alternative and novel applications. [14][15][16][17] Our application is one such. Unfortunately, the number of commercial CFOA devices that have the compensation node externally available is scarce, the model AD844 being a remarkable exception.…”

Section: C2mentioning

confidence: 99%

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Very‐low frequency capacitively coupled AC amplifier with a current feedback operational amplifier

Beloso‐Legarra

Blas

Carlosena

et al. 2023

Circuit Theory & Apps

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SummaryIn this paper, we propose the idea of using transimpedance amplifiers, in lieu of operational amplifiers (OAs) or transconductance amplifiers (OTAs) to design capacitively coupled AC amplifiers. The idea is demonstrated with a current feedback operational amplifier (CFOA) as an active element, which is actually an architecture consisting of voltage buffers and current copiers (mirrors). This last characteristic is further exploited to make the corner frequency of the AC amplifier tunable by means of bootstrapping low‐valued resistors with the output buffer. It is particularly suited to achieve very‐low corner frequencies as needed in applications such as bio‐ or seismic signals. The idea is demonstrated with simulations and experimental results with a discrete implementation.

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Section: C2mentioning

confidence: 99%

Section: Proposed Circuitmentioning

confidence: 99%

Very‐low frequency capacitively coupled AC amplifier with a current feedback operational amplifier

Beloso‐Legarra

Blas

Carlosena

et al. 2023

Circuit Theory & Apps

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“…A differential voltage buffer (DVB), electronically controllable CCII (ECCII‐) and a single‐capacitor based capacitance multiplier has been presented in Jerabek et al 29 The reported circuit can also be used as lossy capacitance multiplier while considering the output resistance of DVB and input resistance at input terminal of ECCII‐. In Özer et al, 30 a generic grounded capacitance multiplier (GCM) has been presented, with four lossy capacitance multipliers implemented using two CFOA and appropriate passive components. An electronically tunable series RC simulator circuit has been presented in Moonmuang et al 31 using two VDBA and one grounded capacitor with an operating frequency range of 10 kHz–100 MHz.…”

Section: Introductionmentioning

confidence: 99%

“…From Table 1, it is seen that there have been limited number of designs of lossy capacitance multipliers in the open literature using various ABBs such as VDTA, VDBA, CFOA, OTA, DVTC, and ECCII. [22][23][24][25][26][27][28][29][30][31][32][33][34] A circuit with parallel immittance simulator having negative resistance and positive capacitance is useful in oscillator design and only one circuit, using two CFOAs, two resistors and one capacitor, has been reported in Özer et al 30 Therefore, in this paper, a new lossy capacitance multiplier circuit is proposed using a single CFDITA, one resistor and one capacitor. The performance of the proposed circuit is validated using 0.18 μm CMOS technology with CFDITA, and experimental results using commercially available ICs AD844 and LM13700 are included to support its performance.…”

Section: Introductionmentioning

confidence: 99%

Single current follower differential input transconductance amplifier based grounded lossy capacitance multiplier with large multiplication factor

Shrivastava

Kumar

Raj

et al. 2023

Int J Numerical Modelling

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In this paper, a new lossy capacitance multiplier (CM) circuit using a single current follower differential input transconductance amplifier (CFDITA), one resistor and one capacitor (virtually grounded) is presented. The proposed circuit does not require any passive component matching constraints and has independently controllable equivalent capacitance with a multiplication factor up to 7102. Both ideal and non‐ideal analyses of the proposed CM circuit are carried out and compared. The performance of the proposed CM circuit is validated using a CMOS CFDITA and its validity is supported by various analyses including frequency analysis, transient analysis, Monte‐Carlo analysis and temperature analysis. The workability of the proposed circuit is also tested using layout design, and its pre and post‐simulated results are appended. The results are further confirmed with experimental results using the AD844 and LM13700 ICs with CFDITA implementation.

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“…For low frequency applications, mostly higher value capacitance is used that increases the size of capacitor (which requires large area on silicon chip and not suitable from the view point of IC fabrication) 1–3 . Consequently, to alleviate these limitations, researchers and circuit designers have stimulated various positive CMs 4–24 and negative CMs, 25–37 employing different active building blocks. These CMs may find various applications in the design of low frequency filters, low frequency oscillators, and integration of a phase‐locked loop filter 38 .…”

Section: Introductionmentioning

confidence: 99%