Design of Isolation Sampling Circuit for High-Power Ultra Wide Frequency Range Pre-Amplifier

With the development of modern satellite communication technology, SAR satellite communication has broad application prospects due to its all-day and all-weather characteristics. The performance of high-power ultra wide frequency range pre-amplifier is the key to determining SAR satellite communication, in order to achieve high-performance closed-loop sampling of high-power ultra wide frequency range pre-amplifier, this paper designs a ultra wide frequency range isolated Sampling circuit. Firstly, a ultra wide frequency range enhanced isolation amplifier is used to isolate and sample the signal. Secondly, the differential signal after isolation sampling is converted into a single ended signal through a high-precision amplifier. Finally, the signal is processed into a signal acceptable to the digital controller through a conditioning circuit. By building an experimental prototype, the effectiveness and feasibility of the ultra wide frequency range isolated sampling circuit are verified.