Integrated Operational Amplifier

In China:

The \infty 表示理想中的无限放大

In United States:

这里补一个概念:

电流为0时可以有电压 (没电流时电压可能存在)

解释: 电压一直有但没回路、没负载,电阻无穷大,电流为0

没有电压必然没有电流 (有电流一定有电压)

解释: 因为电流(电子)流动是因为有电压差

Inversed_Integrated_Operational_Amplifier (反向输入比例运算电路)

i+=0 , u+=0u+=u , u=0 i1=uiuR1=uiR1 , if=uuoRf=uoRfu=0 无电压就无电流, i1=ifuo=RfR1ui\begin{align*} &\because i_+ = 0 \text{ , } \therefore u_+ = 0 \\ \\ &\because u_+ = u_- \text{ , } \therefore u_- = 0 \\ \\ &\text{ } i_1 = \frac{u_i - u_-}{R_1} = \frac{u_i}{R_1} \text{ , } i_f = \frac{u_- - u_o}{R_f} = \frac{-u_o}{R_f} \\ \\ &\because u_- = 0 \text{ 无电压就无电流, } \therefore i_1 = i_f \\ \\ &\therefore u_o = -\frac{R_f}{R_1} u_i \end{align*}

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