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VCA821 线性DB增益的问题

Other Parts Discussed in Thread: VCA821

电路图如VCA821 datasheet figure  74,电路图中没有电源引脚的电容。

cadence 16.6  pspice:输入信号为200mv,频率1meg,实际测得输出随VG的变化如下表,这个结果感觉和datasheet里说明的VG 0-2V变化时的DB线性增益不符合啊。。

怎么理解下面的结果和datasheet里的 线性DB增益啊。。。