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1·In the case of ideal operational amplifier, circuit analysis was simplified by the ideal summing point restraints of zero voltage and zero current at the inverting input.

对于理想的运算放大器而言，通过倒相输入处零电压和零电流的理想求和点限制，可以简化电路分析过程。

2·An instrumentation amplifier offers precise gain without feedback resistors, and, at any value of gain, it provides high input impedances at its noninverting and inverting inputs.

没有反馈电阻的仪表放大器提供精确增益，无论增益多大，放大器的同向和反向输入端提供高输入阻抗。

3·Output from the inverting oscillator amplifier.

内部反向振荡放大器的输出。