New Universal Current-mode Biquad Using Only Three ZC-CFTAs

The objective of this paper is to present a new universal Current-mode biquad capable of providing all the five basic filter functions, namely, low pass (LP), Band pass (BP), high pass (HP), Band reject (BR) and all pass (AP) from the same configuration using only three Z - copy current follower transconductance amplifiers (ZC-CFTA) along with the provision of independent electronic tunability of the filter parameters f0 and Q0 (or bandwidth) through two separate DC bias currents while employing both grounded capacitors as desirable for integrated circuit implementation. The workability of the proposed structure is verified by PSPICE simulations based on CMOS implementation of the ZC-CFTA

HIV-TUBERCULOSIS: A STUDY OF CHEST X-RAY PATTERNS IN RELATION TO CD4 COUNT

Background: Fight against human immunodeciency virus (HIV) is incomplete without addressing problems associated with difcult diagnosis of tuberculosis in HIV-Tuberculosis coinfected patients. Chest X-ray is a primary tool to evaluate tuberculosis in HIV. Aim: To assess and compare various radiological patterns of pulmonary tuberculosis in HIV patients and compare these patterns in relation to CD4 counts. Materials and Methods: Prospective cohort study was conducted in a tertiary hospital in J.L.N.M.C.H Bhagalpur from april 2019 to january 2021 with 200 HIV positive patients. WHO guidelines were used for diagnosis of HIV and tuberculosis. Results: 27% of the patients had sputum positive pulmonary tuberculosis, with higher incidence (33%) among CD4 less than 200 as compared to CD4 more than 200 (14%). Inltration (39%) followed by consolidation (30%), cavity (11%), and lymphadenopathy (9%) seen with CD4 less than 200. Inltration (37.5%) followed by cavity (25%) and miliary (25%) with CD4 above 200. Bilateral (68.5%) and mid and lower zones or all zone involvement more commonly seen. Conclusion: In patients with CD4 lower than 200 noncavitory inltration and consolidation predominated. Involvement of lungs was atypical; diffuse or mid and lower zone involvement was higher than classical upper lobe involvement. A high index of suspicion is necessary for the accurate and timely diagnosis of tuberculosis in HIVpositive patients.</jats:p

New Universal Current-mode Biquad Using Only Three ZC-CFTAs

The objective of this paper is to present a new universal Current-mode biquad capable of providing all the five basic filter functions, namely, low pass (LP), Band pass (BP), high pass (HP), Band reject (BR) and all pass (AP) from the same configuration using only three Z - copy current follower transconductance amplifiers (ZC-CFTA) along with the provision of independent electronic tunability of the filter parameters f0 and Q0 (or bandwidth) through two separate DC bias currents while employing both grounded capacitors as desirable for integrated circuit implementation. The workability of the proposed structure is verified by PSPICE simulations based on CMOS implementation of the ZC-CFTA

ERRATA: OTRA-Based Multi-Function Inverse Filter Configuration

In the article published by mentioned authors with DOI:10.15598/aeee.v15i5.2572 were found accidental errors in four references. These errors were caused by human factor and deficient communication between the authors and publisher. Correction is published on the basis of the author’s request. The editorial members of Advances in Electrical and Electronic Engineering apologize to the authors and readers of the journal for not detecting the problem with references during the publication process