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为什么INA101HP放大2倍的电压信号后出现截止。。。

设计了一个2倍放大的电路,采用的是正负12V的电源供电,当输入为4V时,输出出现了信号截止,波形被削顶。而将电源换为正负15V的电源时,输入+4V放大两倍又能够输出8V的电压。这是为什么?是因为芯片出现饱和了吗