这是手册上给出的OPA335构成的电桥电路,我现在想用这个电路进行测温(其中一个电阻换成PT100铂热电阻),但是我搞不清以下问题:
1.这个OPA335作用是什么?有必要加这个运放吗?
2.测温时热电阻阻值会发生变化,那么运放的闭环放大倍数不久改变了么?
3.R和R1该怎么选取大小?
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