INA202的两个输入都悬空时,输出为什么还有27mV的电压?
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您好,
任何运放的输入端在任何情况下都必须给一定的准位作为输入,包括连接输出作反馈。最大的原因是floating 会引入外部噪声,引入噪声的不确定性让我们难以分析这时候的performance,只有在保证运放连接正确的情况下才有依据谈offset 这些因素的影响。