The requirements for micro stress measurement of strain gauge are high precision，high linearity，high stability and high gain. One kind of differential amplifier circuit with excellent performance was designed. Some skillful techniques were adopted to avoid common voltage in the circuit and to reduce the temperature drift. The gain linearity is about 0.01%，and its Common-Mode Rejection Ratio(CMRR) is about 129 dB under work conditions.
江孝国,杨兴林,李 洪,文 龙,石金水,张开志,李 劲,王 远.高精密度、高稳定度的应变计测量差动放大电路[J]. Journal of Terahertz Science and Electronic Information Technology ,2010,8(5):573~576Copy