Analog Inverse Filters Using OTAs

Srivastava, Jyoti; Bhagat, Ram; Kumar, Pragati

doi:10.1109/iccar49639.2020.9108048

Cited by 10 publications

(4 citation statements)

References 14 publications

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“…provides the stable inverse filter characteristics for the proposed FLPF, fractional-order high-pass filter (FHPF), FBPF, and FBSF. The inverse filter transfer functions proposed in this work are also different from those published in the literature [36][37][38][39][40][41]. Henceforth, the FO inverse LP, HP, BP, and BS filters will be abbreviated as FILPF, FIHPF, FIBPF, and FIBSF, respectively.…”

Section: Proposed Techniquementioning

confidence: 94%

Further Generalization and Approximation of Fractional-Order Filters and Their Inverse Functions of the Second-Order Limiting Form

Mahata¹,

Herencsár

Kubánek

2022

Fractal Fract

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This paper proposes a further generalization of the fractional-order filters whose limiting form is that of the second-order filter. This new filter class can also be regarded as a superset of the recently reported power-law filters. An optimal approach incorporating constraints that restricts the real part of the roots of the numerator and denominator polynomials of the proposed rational approximant to negative values is formulated. Consequently, stable inverse filter characteristics can also be achieved using the suggested method. Accuracy of the proposed low-pass, high-pass, band-pass, and band-stop filters for various combinations of design parameters is evaluated using the absolute relative magnitude/phase error metrics. Current feedback operational amplifier-based circuit simulations validate the efficacy of the four types of designed filters and their inverse functions. Experimental results for the frequency and time-domain performances of the proposed fractional-order band-pass filter and its inverse counterpart are also presented.

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Section: Proposed Techniquementioning

confidence: 94%

Further Generalization and Approximation of Fractional-Order Filters and Their Inverse Functions of the Second-Order Limiting Form

Mahata¹,

Herencsár

Kubánek

2022

Fractal Fract

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“…Thus, theoretically, all these cases represent unstable systems. Now, the fact that a number of authors have come up with first-order inverse all-pass filter [10,19,33], second order IHP [1,9,[11][12][13][14][15][16][17][18]20,22,23,27,28,30,32,35,36,[39][40][41][42][43], IBR [11,12,15,17,22,24,25,27,29,32,35,36] and IAP [8,9,24,27,29] filters, it is a matter of curiosity as to how the observance of instability was not reported by any of them. There could be two possible reasons for this:…”

Section: Stability Considerationsmentioning

confidence: 99%

Inverse Analog Filters: History, Progress and Unresolved Issues

2022

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This paper traces the history of the evolution of inverse analog filters (IAF) and presents a review of the progress made in this area to date. The paper, thus, presents the current state-of-the art of IAFs by providing an appraisal of a variety of realizations of IAFs using commercially available active building blocks (ABB), such as operational amplifiers (Op-amp), operational transconductance amplifiers (OTA), current conveyors (CC) and current feedback operational amplifiers (CFOA) as well as those realized with newer active building blocks of more recent origin, such as operational transresistance amplifiers (OTRA), current differencing buffered amplifiers (CDBA) and variants of current conveyors which, although not available as off-the-shelf ICs yet, can be implemented as complementary metal–oxide–semiconductors (CMOS) or be realized in discrete form using other commercially available integrated circuits (IC). In the end, some issues related to IAFs have been highlighted which need further investigation.

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“…Inverse filters have a frequency response which is reciprocal of the frequency response of their conventional counterparts, that is, low pass, high pass, and band pass. Second‐order inverse filters have been widely introduced in the literature, 1–4 but a limited number of first‐order structures have been published 5 . More specifically, the inverse filter structures in Shah et al 6,7 are current mode inverse all pass filters using as active elements four terminal floating nullor (FTFN) and current differencing transconductance amplifiers (CDTAs), respectively.…”

Section: Introductionmentioning

confidence: 99%

First‐order inverse filters: Implementations using a single voltage conveyor and potential applications

Psychalinos

Mınaeı

Yeşil

2022

Circuit Theory & Apps

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First-order low pass and high pass inverse filter topologies, offering simplicity and independent adjustment of the gain and the characteristic frequency, are introduced in this work. These features are offered thanks to the terminals properties of the second generation voltage conveyor. In addition, possible applications of these types of filters are exploited. The behavior of a control system, where these filters are incorporated, is evaluated in both frequency and time-domain using the Cadence IC design suite.

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Analog Inverse Filters Using OTAs

Cited by 10 publications

References 14 publications

Further Generalization and Approximation of Fractional-Order Filters and Their Inverse Functions of the Second-Order Limiting Form

Further Generalization and Approximation of Fractional-Order Filters and Their Inverse Functions of the Second-Order Limiting Form

Inverse Analog Filters: History, Progress and Unresolved Issues

First‐order inverse filters: Implementations using a single voltage conveyor and potential applications

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