Design of Narrow Edge Liquid Cooled Solid State Pulsed Power Amplifier in X Band With Integrated Control System

This paper presents the design of Narrow edge Liquid cooled Solid State GaN Based Pulsed Power Amplifier with integrated control system. The PA receives the low RF input from exciter unit and provide the sufficient gain in different stages to give the high output RF power over the operational frequency band. It can transfer the heat generated (around 200W) from the GaN devices to the liquid cooled system through thin narrow edge (around 35 mm wide) contact of the Power amplifier. It can work for narrow pulse 100ns to wide pulse 25µs. This module has a FPGA based Monitor & Control card for achieving 100Mbps communication with Radar Controller using LVDS lines. Internal supply to GaN PA devices get cut-off, if the external cover pulse exceeds higher limit of pulse width, thereby preventing the PPA from entering in long pulse width operations & increasing the reliability of the GaN PA devices. The module is designed, fabricated & tested successfully and meets all the required specifications.