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仪表放大器温漂严重

Other Parts Discussed in Thread: OPA2188, INA121

电路如图,排除单片机和参考温漂,测得INA121输出存在温漂,-20~+70℃之间,烘箱一开始吹板子,AD就开始随风摆动,INA121输出0.2-2V,放大约20倍。全温区温漂在20MV左右,不知道是片子问题还是增益电阻或其他什么问题,电路如图,其中119MV为OPA2188根据参考跟随而来,请教,感谢。