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1-1运算放大器的特性（什么是理想的运算放大器？）
通常，放大器应既不影响前级电路，也不受后级电路影响。因此，放大器应具有高输入阻抗和低输出阻抗。
运算放大器的特性恰好接近这些要求。下面比较了理想和实际的运算放大器：
尽管现实中不存在理想运算放大器，但您可在设计阶段的早期假设理想运算放大器。但在进入详细设计阶段后，您应考虑理想运算放大器与实际运算放大器之间的差异。
例如，如果运算放大器的输入阻抗较低，则其输入电压来自该运算放大器的输入阻抗以及前级设备的输出阻抗。运算放大器的低输入阻抗也会影响其反馈回路。如果运算放大器的输出阻抗较大，则其输出电压来自该运算放大器的输出阻抗及其负载的阻抗。
但在典型应用中，运算放大器的输入阻抗与前级电路的输出阻抗相比可忽略不计，而运算放大器的输出阻抗与后级负载的阻抗相比也可忽略不计。因此，这些阻抗通常没有重大影响。上面显示的其它参数亦如此。
但有必要在创建详细设计时检查其影响。
