Research on High-power Wide Frequency Range Pre-Amplifier

The pre-amplifier is widely used in SAR system, which is used to achieve lower-power and fast comparators. With the development of satellite technology, high-power SAR satellites show broad application prospects in the future. The lower-power pre-amplifiers are difficult to meet the requirement of high-power SAR satellites. The digital power pre-amplifier is designed that achieve a high efficiency across the entire universal input frequency range for SAR satellites application. The H bridge cascaded multilevel inverter is selected as the topology to achieve high-power pre-amplifier application. Based on the theoretical research, the hardware of H bridge cascaded five-level inverter control by DSP and FPGA is designed. The experiments results verify the prototype design is rational and feasible.