Question:medium
Calculate the output voltage of an op-amp for input voltages of \(V_{i1}=150\mu V\) and \(V_{i2}=140\mu V\). The amplifier has a differential gain of \(A_d=4000\) and the value of CMRR is \(100\):
Calculate the output voltage of an op-amp for input voltages of \(V_{i1}=150\mu V\) and \(V_{i2}=140\mu V\). The amplifier has a differential gain of \(A_d=4000\) and the value of CMRR is \(100\):
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For op-amp problems involving CMRR:
\[
\text{CMRR}=\frac{A_d}{A_c}
\]
Always calculate:
• Differential voltage \(V_d=V_1-V_2\)
• Common-mode voltage \(V_c=\frac{V_1+V_2}{2}\) Then use: \[ V_o=A_dV_d+A_cV_c \] to obtain the final output voltage.
• Differential voltage \(V_d=V_1-V_2\)
• Common-mode voltage \(V_c=\frac{V_1+V_2}{2}\) Then use: \[ V_o=A_dV_d+A_cV_c \] to obtain the final output voltage.
Updated On: May 22, 2026
- \(145 \text{ mV}\)
- \(14.5 \text{ mV}\)
- \(45.8 \text{ mV}\)
- \(40.006 \text{ mV}\)
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The Correct Option is A
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