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LMP7716

Other Parts Discussed in Thread: LMP7716

各位工程师好,如图,我的运放用的是LMP7716,同相放大器电路如图。 测试过程中调整滑动变阻器,一直保持输出在1V~2V之间,但是实测的同相输入端(v+)、反向输入端(v-)不仅不会相等,而且压差与理论偏差很大。 用图1测试,V+ 和 V- 电势差一直保持在 V+ - v- =600uV, 改变放大倍数 用右图测试 则 V+ 和 V- 电势差一直保持在 V+ - v- =1.2~1.5mV。