电阻温度变送器的有源电桥电路

An Active Bridge Circuit of Resistance Temperature Transmitter

提出了一种供电阻温度变送器测温用的有源电桥电路，该电路采用了精密恒流源集成电路、集成电压跟随器和模／数转换器，它具有线性特性，完全消除了引线电阻及其温漂、电桥电压变动和电桥稳压电源的供电质量对测量准确度的影响。

An active bridge circuit used by resistance temperature transmitter is designed.In this circuit,precision constant-current source integrated circuit,integrated voltage tracker and A/D converter are adopted.It is a linear circuit and the effects to accuracy caused by lead-line resistance,temperature drift and bridge voltage wave motion are cancelled completely.