Publications/Projects

Research/Publications

Md Yekra Rahman, Sharif Mohammad Mominuzzaman. “Exploring Lead Free Mixed Halide Double Perovskites Solar Cell,” 2024 13th International Conference on Electrical and Computer Engineering (ICECE), Dhaka, Bangladesh, 2024, pp. 165-170, doi: 10.1109/ICECE64886.2024.11024609.

Projects

DC-DC BUCK CONVERTER
  • The MOSFET’s key parameters, including Rds(on) , Qoss , and Qg  were calculated and visualized to optimize the buck converter’s power stage.
  • Using MATLAB to minimize power losses (PLOSS = PCOND + PSW), the high-side and low-side MOSFET widths were optimized ensuring minimal losses.
  • The gate driver circuit incorporated level shifters, bootstrap circuits, and dead-time generators to prevent shoot-through currents, enhance efficiency, and ensure robust performance using TSMC’s 180 nm technology.
Gate Driver Design
Up Level Shifter Design
Down Level Shifter Design
Output Voltage and Ripple
Inductor Current and Ripple

Design of an Operational Amplifier using IBM 130nm CMOS technology (Link)

Small signal model of two stage op-amp

ECG Based Biometric Recognition (Link)

  • Designed a biometric recognition system to authenticate individuals using ECG signals.
  • Applied advanced signal processing techniques, including Chebyshev low-pass filters, median filters, and Maximal Overlap Discrete Wavelet Transform for feature extraction.
  • Utilized the Weighted K-Nearest Neighbors algorithm with the Euclidean distance method for classification, validated through a 5-fold cross-validation process.
Effect of Chebyshev low-pass filter, median filters
R Peak Detection using modwt
Beat Segmentation
Normalized Average Beat
PQST Detection
DCT Coefficient of different records from a single person
Fiducial Features Extraction
Accuracy

Phase Locked Loop: Design and Implementation (LINK)

  • Designed a phase-locked loop circuit using the Cadence tool, creating each component from scratch with the analog library.
  • Developed key blocks, including the Phase Frequency Detector, Charge Pump, Current-Starved Voltage-Controlled Oscillator, and Frequency Divider, to construct the complete circuit.
  • Showcased expertise in analog circuit design and proficiency in leveraging Cadence for complex circuit implementations.
Circuit Diagram of PLL
Phase Frequency Detector
Charge Pump
Loop Filter
Current Starved Voltage Control Oscillator (CSVCO)
Frequency Divider
Final Output

Electronic Voting Machine (LINK)

  • Designed a reliable voting system integrating biometric authentication and IoT technology for enhanced security and efficiency.
  • Implemented fingerprint recognition as a biometric method to prevent unauthorized access and ensure voter integrity.
  • Developed a system that enables quick and secure result publishing, minimizing the risk of manipulation and enhancing trustworthiness.
Design Method
Circuit Diagram
Top layer of PCB design

Automated Traffic Control System (LINK)

Chankharpul Circle collected from Google Map
  • Designed an automatic traffic control system for a 5-way circle named “Chankharpurl More” without using any Arduino or microprocessor.
  • Employed Proteus for simulation and built the system physically using ICs and Gates,
Proteus Model
555 Timer and IC 4017 to Generate 10 seconds period
Implementing all cases by basic gates
555 Timer for 1 second
Input of seconds to display
Two 7 segment displays to show numbers up to 99

Investigating the Effect of HVDC Connection and Large Industrial Loads in IEEE 39-Bus Network 

Methodology
  • Conducted load flow analysis using the Newton-Raphson method to evaluate the impact of HVDC connections and large industrial loads.
  • Designed and simulated an HVDC line between Bus-39 and Bus-9 using PSAF software, addressing voltage stability and line overloads.
  • Added induction motors to emulate an industrial plant, optimizing generator outputs and integrating Static VAR Compensators (SVCs) to stabilize the system.
  • Improved system performance by mitigating voltage violations and managing line overloads through advanced modeling and power flow techniques.
No Overloaded Transformer
Addition of HVDC Line
No Overloaded Transformer
Addition of Industrial Plant (Induction Motors)
Overloaded Lines
Solution
Bus Report (After All SVC connection)