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OPA818: Consultation on noise interference of chip follower solution

Part Number: OPA818
Other Parts Discussed in Thread: BUF602

1. The application form of OPA818 in our company is a follower module, and the input signal frequency bandwidth is 100KHz--200MHz;
2. When the input signal is a square wave signal, 400mV VPP similar to sine wave interference signals will appear at high and low levels. Download the OPA818 simulation model from TI's official website and simulate the actual circuit construction. The results are consistent with the actual situation. The simulation screenshots are as follows, please help Give the next theoretical explanation