用ref3030+opa2335做恒流源,一打开开关,5V供电,输入电压就直接被拉低到1点几伏了,输入电流达到了1点几安,没想明白问题。
温度传感器:PT100。
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做PT100的驱动,我们有专用的ADC, ADS1248,里面集成了电流源,可以做到很高的温度测量精度。
好的,回头看看,谢谢。
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以上问题已经解决。