Electro-Optical Phase Locked Loop design for FMCW LiDAR TX in 28-nm CMOS

This Paper presents the Electro-Optical Phase Locked Loop(EOPLL) design process to stably drive distributed Bragg Reflector(DBR) Laser Diode in the Frequency-Modulated Continuous Wave Light Detection and Ranging(FMCW LiDAR) System. The Optical Circuit performs a function of Mach-Zehnder interferometer. I model the mathematical function of this optical circuit based on the extracted parameters by using Verilog-A and apply a loop filter design method of Type II PLL. Through Post-Simulatoin, it is confirmed that the PLL locks and the output frequency of the Laser is modulated linearly. It is designed by FD-SOI 28nm CMOS Process, and the gain current of the Laser Diode is 50mA. Polarization Maintaining Fiber (PM Fiber) is used for high SNR.