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buf634的使用问题

Other Parts Discussed in Thread: BUF634

用buf634做一个简单的缓冲模块,电路图如下,输入幅值为2V,频率为1M的脉冲信号,供电为-+5V。。。测试结果开始正常,但是大概10几秒后输出幅值为1.2V左右,输出波形出现一定程度上的失真,请问这是什么原因