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压控放大器VCA821数据手册中的疑问

Other Parts Discussed in Thread: VCA821

   在VCA821数据手册中的page11中的Figure 33,Figure 34下图所示

  Figure 33输入200mVpp,小信号频率响应在Vg=2V时,增益是最大增益即20dB (10V/V),那么输出信号2Vpp。Figure 34中,大信号频率响应曲线(Vo=2Vpp)。那么Figure33(Vg=2V)的曲线和Figure34(Vo=2Vpp)的曲线为什么差别那么大呢?