# 共模抑制比

${\displaystyle V_{\mathrm {o} }=A_{\mathrm {d} }(V_{+}-V_{-})+{\frac {1}{2}}A_{\mathrm {cm} }(V_{+}+V_{-})}$

${\displaystyle K={\frac {A_{d}}{A_{\mathrm {cm} }}}}$

${\displaystyle \mathrm {CMRR} =10\log _{10}\left({\frac {A_{\mathrm {d} }}{A_{\mathrm {cm} }}}\right)^{2}=20\log _{10}\left({\frac {A_{\mathrm {d} }}{|A_{\mathrm {cm} }|}}\right)}$

## 运算放大器的例子

${\displaystyle V_{\mathrm {out} }=(V_{+}-V_{-})\cdot G_{\mathrm {openloop} }}$

## 参考文献

1. ^ dB: What is a decibel?. School of Physics, UNSW. [2011-01-16]. （原始内容存档于2020-12-09）.
2. ^ Gianluca Giustolisi, Member, IEEE, Giuseppe Palmisano, Member, IEEE, and Gaetano Palumbo, Senior Member, IEEE. CMRR Frequency Response of CMOS Operational Transconductance Amplifiers. IEEE Xplore. [2011-01-16].
3. ^ What You Shoud Know about (741) Operational Amplifier?. DATASHEET and Circuit Diagram. [2011-01-17]. （原始内容存档于2020-07-03）.
4. ^ LM4562, Dual High Performance, High Fidelity Audio Operational Amplifier from the PowerWise® Family. National Semiconductors. [2010-01-16]. （原始内容存档于2010-01-23）.