Electronically tunable current mode biquad filter based on single VDTA and grounded passive elements

Abstract

Abstract-This paper presents a new filter structure based on only single voltage differencing transconductance amplifier (VDTA) and three grounded passive elements and has capability to low pass (LP), band pass (BP), high pass (HP), band reject (BR) and all pass (AP) biquad filtering functions at an explicit current output by the use of appropriate selection of three current input signals. Hence, it is fully integrable, canonical in nature and universal current-mode (CM) biquad. Besides it, the proposed filter also enjoys few more desirable features such as low active and passive sensitivities, low power consumption and orthogonal tunability of pole frequency and quality factor by electronic means. The presented filter is simulated using PSPICE in 0.18µm CMOS process.

Uncertainty Quantification of CMOS Active Filter Circuits: A Non-Intrusive Computational Approach Based on Generalized Polynomial Chaos

“…In this aspect, Monte Carlo methods seem to have attracted considerable attention, although the ensemble volumes preferred may perhaps be insufficiently small. Among several recent publications proposing novel CMOS active filter structures, the ensemble volumes can be observed to be less than 100 [12]- [16], between 100 and 500 [17], and just a little more than 1000 [18], [19]. Such small ensemble volumes may compromise accuracy of the Monte Carlo analysis results.…”

“…In previous publications, random parameters in uncertainty quantification are chosen to belong to the Gaussian distribution [12]- [14], [17], [19], or occasionally to the uniform distribution [16]. The practically more realistic truncated Gaussian distribution seems not to be considered in general.…”

“…Also, uncertainty quantification analysis reports seem to be either communicated through histograms [12], [17], [19], or, as in several other studies [13]- [16], [18], [20]- [23], items in an ensemble generated via Monte Carlo are superimposed to offer a visual aid as to how process variation oriented deviations might affect the responses of a filter circuit, suggesting that better visualizations may perhaps be available.…”

“…A non-intrusive approach is preferred, not requiring analytically available response expressions (unlike [24]), or modifications incorporated into nodal analysis (unlike [25]); and parametric deviations in virtually any component of a circuit can be accounted for (again unlike [25]). The gPC-oriented framework designed and utilized in this paper provides the user with a variety of distributions for parametric modelling, including the uniform, Gaussian, and the truncated Gaussian genres, i.e., a wider range of distributions than those in [12]- [14], [16], [17], [19]. In order to verify the accuracy of stochastic collocation, Monte Carlo is used as the reference method, in each case with an ensemble volume of 10 5 , which is much more than that utilized in each of [12]- [19].…”

A Novel Simple Differentiator Circuit Based on Carbon Nano Tube Field Effect Transistors Voltage Difference Transconductance Amplifier

“…In view of carrying such specific properties, the VDTA has been treated as the most favored element in use for various applications. Some of the applications include filters, oscillators, simulation of inductors and capacitors which use one VDTA block taking the help of capacitors [22][23][24][25][26][27][28][29][30][31][32][33]. Some of the current mode devices are furnished below.…”