问题：PGA放大倍数越大，输入信号幅值衰减越厉害。比如：当输入信号为5kHz、20mVpp的正弦波时，放大100倍，用NI9234采集PGA输出信号作FFT，发现5kHz处谱线幅值只有0.69454V；当输入信号为625Hz、20mVpp的正弦波时，放大100倍，幅值只有0.89956V。是PGA113不能像如下接法吗？
电路原理图：PGA参考电压为1.5V，由双基准电压源REF1930提供
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