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仪表放大器怎么调零

Other Parts Discussed in Thread: INA819

仪表放大器失调电压怎么调零?比如INA819,是像一般运放一样在输出端通过电位器调?能不能通过REF引脚来做调零?反正后级的AD也是双极性的。

如果用REF来调零,增加的器件太多了,电压跟随器、点位器、电阻,每个器件都要关注温漂,成本太高了,尤其是20ppm一下的电位器。

顺便再请教一下,为什么运放的调零都在输入端调?不能在输出端调零吗?

我是模拟新手,请多指教