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Enhancing the Dc Open Loop Gain and Voltage Swing of a Single Stage Telescopic Cmos Op Amp

Ashagrie, Aragaw (2024-10)

The main objective of this research is to enhance the DC open loop gain and voltage swing of a Telescopic CMOS op amp by using OrCAD PSPICE design and simulation software, based on electronic devices and advanced integrated ...

Design and Simulation of A Fully Differential Cmos Op Amp

Andargie, Adelegn (2024-10)

The need to design and manufacture CMOS ampliﬁers to maintain acceptable level of performances at low voltages is immensely important. This research work emphasizes on investigating the CMRR, slew rate, and DC gain of ...

Solar Uv Temporal Variations During Solar Cycle 23 And 24

Zeleke, abebech (2024-10)

This study investigated the temporal variations of solar UV radiation during Solar Cycles 23 (1996-2008) and 24 (2009-2020). The broader implications of the UV irradiance variation for Earth’s atmosphere, climate and ...

The Study of Practical Application of the Josephson Tunneling

Desta, Abebaw (2024-09)

This graduate project work focuses on the practical application of Josephson tunneling. Using the time-dependent Schrödinger equation, we derived the mathematical expressions for current density (J), phase difference , ...

Washera Geospace and Radar Science Research Laboratory

Haron, Esleman (2024-10)

The sun’s activity governs the interaction of the magnetosphere with the solar wind and Earth’s magnetic field. The influence of the magnetosphere is known as a geomagnetic storm. The main purpose of studying geomagnetic ...

Modeling Solar Irradiance Using Multiple Linear Regression and Decision Tree Machine Learning Models over Lalibela, Ethiopia

Eshetie, Belete (2024-09)

Solar irradiance is a critical factor influencing the output of solar power plants, and its accurate prediction can help reduce the uncertainty caused by its intermittent nature. This study evaluates the performance of ...

Solar activity impact on the earth's upper atmosphere inferred from ground-based GPS measurements over Addis Ababa, Ethiopia during 2012 - 2016

Tadele, Adamu (2024-09)

The main aim of this thesis is to explore how solar activity impacts the upper atmosphereabove Addis Ababa, Ethiopia, situated at 9.040°N and 38.770°E. Spanning from 2012 to 2016, the study employs ground-based GPS data ...

Analysis of Multi-Frequency GNSS Ionosphere Scintillation over Bahir Dar Ethiopia

Amisaya, Meseret (2024-06)

Global Navigation Satellite System (GNSS) and international telecommunications critical to a modern technological world are frequently disrupted by the Earth’s iono sphere. Trans-ionospheric satellite navigation links ...

Utilizing Supervised Machine Learning for the Size Determination of Zinc Oxide Nanoparticles

Alayou, Surafel (2024-06)

In semiconductor physics, precise ZnO nanoparticle size determination is crucial due to its impact on material properties and applications. Traditional methods like electron microscopy were limited by their complexity ...

Optical Properties of Tellurite Based Glasses Doped with Dy for Photonic Applications

Ejigu, Afrash (2023-06)

n this thesis work, Zinc Niobo Tellurite (TNZ) and Cadmimun Niobo Tellurite (TNC) glass systems with general formula (70-y-z)TeO 2 -(20-x)Nb 2 O 5 -(10+x) ZnO-yEu -z Dy 2 O 3 and (70-y-z)TeO 2 -(20-x)Nb ...

The Effect of Load Capacitances on the Icmr And Dc Gain of Differential Input/Output Cmos Op-Amp

Kindie, Yeshiwas (2023-06)

Due to the problem associated with device power dissipation, the demand for high DC open loop gain, and wide input common mode range of voltage. CMOS circuit device is increasing at a faster rate because of a wider ...

Comparative Study of Rainfall Modeling Using Machine learning and ECMWF models over Bahir Dar

Getnet Yirga (2023-07)

Rainfall causes natural disasters such as floods that people around the world face every year. Rainfall prediction is of great importance for countries like Ethiopia, whose economy is heavily dependent on agriculture. ...

Modeling Ionospheric Total Electron Content Using Gradient Boosting Based and Stacking Machine Learning Over Addis Ababa

Ayanew Nigusie (2023-07)

For regions where TEC data from ground observations is unavailable, modeled TEC is used to characterize ionosphere conditions. Accurately predicting TEC data is crucial to mitigating its effects on radio communication ...

Understanding the drivers of global ionospheric variations during geomagnetic storm

Dejene Ambisa (2023-06)

The behaviour of the Earth’s ionosphere during 17-18 March 2015 geomagnetic storm has been investigated by different studies. However, the spatio-temporal evolution of the drivers of global ionospheric effect and ...

Characterization of the Varia-tions of Energetic Electrons Flux in Earth’s Outer Radiation Belt

Geletaw Behailu (2023-02)

Earth’s radiation belts composed of two toroidal belts of energetic electrons and ions surrounding the Earth. Particularly, the outer radiation belt lies at geocenteric radial distance between 3RE and 7RE (where RE is ...

Current Buffer Technique for a Two Stage Cmos Op Amp Design

Gizatu Mihiretie (2022-12)

The main task of this research is to study the current buffer technique for the two stage CMOS operational amplifier design. It involves three basic concepts, theoretical calculation, design, simulation, and verification ...

Comparison of GPS-VTEC observations over Addis Ababa with IRI-Plas 2017 model predictions

Haimanot Sisay (2023-02)

In this thesis, GPS-VTEC measurements are used to assess the performance of the most recent International Reference Ionosphere extended to the plasmasphere (IRI-Plas 2017) model. GPS-VTEC data is obtained from a ...

Synthesis and Optical Characterization of Undoped and Co-Doped Bismuth Ferrite Nanoparticle for Photovoltaic Application

Samrawit Zemene (2022-11)

The objective of this thesis was to chemically produce Multiferroic Bismuth Iron Oxide (BiFeO3) (BFO) and cobalt doped Bismuth Iron Oxide (BFCO) nanoparticles for photovoltaic applications. The syntheses in these ...

Superconducting and Magnetic Properties of Superconductor SmFeAsO1-xFx

Gete Mekuriaw (2022-11)

This project work focuses on the possibility of coexistence of superconductivity and magnetism in Samarium arsenide oxide superconductor (SmO1-xFxFeAs). Using the model Hamiltonian and retarded double time temperature ...

Optical and structural property of pure chromium oxide and Al doped chromium oxide Nanoparticles

Derbew Zewdu (2022-12)

In this masters project, the literatures survey of pure chromium oxide and aluminum (Al) doped chromium (III) oxide (Cr2O3) nanoparticles are summarized. The band gap and crystal size are determined by the Brus equation, ...

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