目录
- 1. 求差电路
- 2. 求和电路
- 3. 积分电路
- 4. 微分电路
1. 求差电路
-
输出电压
v o = ( 1 + R 4 R 1 ) ( R 3 / R 2 1 + R 3 / R 2 ) v i 2 − R 4 R 1 v i 1 v_o = (1+\frac{R_4}{R_1})(\frac{R_3/R_2}{1+R_3/R_2})v_{i2} - \frac{R_4}{R_1}v_{i1} vo=(1+R1R4)(1+R3/R2R3/R2)vi2−R1R4vi1
选取合适的电阻，使 R 4 R 1 = R 3 R 2 \frac{R_4}{R_1} = \frac{R_3}{R_2} R1R4=R2R3，则有
v o = R 4 R 1 ( v i 2 − v i 1 ) v_o = \frac{R_4}{R_1}(v_{i2} - v_{i1}) vo=R1R4(vi2−vi1) -
输入电阻
R i = R 1 + R 2 R_i = R_1 + R_2 Ri=R1+R2 -
共模抑制比
K C M R → ∞ K_{CMR} \to \infty KCMR→∞
2. 求和电路
- 电路图
- 输出电压
v o = − R 3 ( v i 1 R 1 + v i 2 R 2 ) v_o = -R_3(\frac{v_{i1}}{R_1} + \frac{v_{i2}}{R_2}) vo=−R3(R1vi1+R2vi2)
若 R 1 = R 2 = R 3 R_1 = R_2 = R_3 R1=R2=R3
v 0 = − ( v i 1 + v i 2 ) v_0 = -(v_{i1} + v_{i2}) v0=−(vi1+vi2)
3. 积分电路
v o = − 1 R C ∫ v I d t v_o = - \frac{1}{RC}\int v_Idt vo=−RC1∫vIdt
4. 微分电路
v o = − R C d v I d t v_o = -RC\frac{dv_I}{dt} vo=−RCdtdvI
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