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LMH6401: LMH6401 Offset or simulation error

chaoqiang chen
Prodigy 60 points
Part Number: LMH6401
Other Parts Discussed in Thread: BUF802

Hi, Team 

      When I used the BUF802 and 2x LMH6401 for the analog front-end design, I found that the first-stage LMH6401 still had a 600mV common-mode voltage even with Vocm grounded. Is this an issue with the circuit design or a problem with the simulation model?