摘要
研究分析了用于放大微弱信号的三运放构成的测量放大器的共模抑制比,根据影响其共模抑制比的因素,在考虑有噪声干扰、非理想运放、电阻匹配及其应用条件的情况下,提出一种新的计算共模抑制比的模型。最后用构建的三运放测量放大器电路的实际共模抑制比测量值与本文所提出模型的理论计算值相比较,其结果证明了本文所提出的计算模型提高了三运放测量放大器的计算精度、扩展了应用范围,并且是有效合理的。
This paper researches the common mode amplifier which amplifies weak signal and presents rejection ratio （CMRR） of 3 op-amp instrumentation a new calculation model by the factors of noise, non-ideal amplifiers, matched resistor and application restricted. At last, an instrumentation amplifier was designed and built and its measured and computed results of model are compared. The results show that this model presented enhances calculating precision and extends application range of instrumentation amplifier. It is valid and reasonable.
出处
《电子器件》
CAS
2009年第3期601-603,607,共4页
Chinese Journal of Electron Devices
基金
国家部委项目资助(9140C0905040706)
