ywguo
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Hi, eng,
The input common mode voltage depends on your configuration and application. If the input of opamp is virtual ground, it is OK to choose VinCM = 540mV in your example. However, if the opamp is used as voltage follower, the VinCM should be set in the middle of input range.
If you need large output swing, why don't choose AC coupling between the adjacent opamps? Another choice is design a rail-to-rail input opamp. The problem is how large output swing do you need?
Best regards, Yawei
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