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ths3091的应用问题

电路如图 实际搭建中阻抗匹配 电源去耦都做了 不带50欧负载直接接示波器时正常 带50欧负载后再接示波器会在40M-60M出现大约3db尖峰响应 平坦度起伏太大 请问是怎么回事 如何改善

使用同轴屏蔽线直接接的300M示波器