Projects

• Stability Analysis of Single-Port Reflection Amplifier

  A reflection amplifier is a device that reflects an amplified output signal back through the same input port. Traditional stability tests, such as unconditional stability and their derivatives (e.g., the 𝐾−Δ test), do not apply to reflection amplifiers. Therefore, additional research is necessary to design a robust reflection amplifier and an active Reconfigurable Intelligent Surface. To thoroughly understand stability and prevent oscillation, I employed Barkhausen's criterion, multiple reflection analysis, pole-zero analysis, and network analysis.

• Patch Antenna Design and Measurement

  I designed a 9.8GHz microstrip patch antenna, progressing from CST simulation to Eagle CAD layer design and performance measurement. I possess a strong understanding of the trade-offs involved in antenna gain, power efficiency, size, reflection coefficient, surface current, and other key factors. Alongside my experience in antenna engineering, I have also completed courses in microwave and optics experiments, equipping me with proficiency in using VNAs, signal generators, and various other microwave devices. 

• Viterbi Algorithm

  I completed a project on the Viterbi hard and soft decoding algorithms, focusing on the design of a communication system that encompasses channel encoding/decoding and modulation/demodulation for channel estimation. The project employed various modulation constellations, including BPSK and 64QAM. Key metrics such as log-likelihood ratio (LLR), bit error rate (BER), and block error rate (BLER) were used to assess the system's performance.

• Operational Amplifier Design

  I designed a rudimentary operational amplifier using PSPICE. The design process incorporated essential techniques, including a differential amplifier for minimizing noise, a current mirror for biasing, and feedback to ensure desired bandwidth. Stability and phase margin were carefully analyzed to prevent oscillations, with Miller compensation.

• FPGA: Eagle-Run Game Design 

  I have developed a complete game using the Pynq-Z2 FPGA board. Throughout the project, I primarily used Verilog (with Vivado) and C (via Vitis) for I/O control. I implemented digital FIR/IIR filter design based on z-transform principles, incorporated Finite State Machine (FSM) concepts for smooth game transitions, and utilized the AMBA protocol for managing sound effects.