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THS4521问题

Other Parts Discussed in Thread: THS4521

做一个应用,需要放大一个差分信号。一个THS4521放大倍数不够,想用两个级联起来,做2次放大。不知道这种用法对不对。在TINA里面仿真,第二级Vocm虽然给的电压时1.65V(VCC3.3V),但是无信号输入时VOUT+、VOUT-分别是1.71V和1.59V。请问一下,这种用法对吗?另外这种现象是什么原因?