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OPA1612输入阻抗问题

Other Parts Discussed in Thread: OPA1612, OPA2134

OPA1612手册第3页最后几行,Input Impedance栏:Differential                           20KΩ || 8pF

                                                                                              Common-Mode                  10^9Ω || 2pF

对这个指标不是很明白,如果我用它做电压跟随,输入阻抗是多少呢?

那个Differential的输入阻抗指什么意思?