在许多信号采集中 ,我们关心的不是信号的绝对大小 ,而是相对关系 ,即波形。这时 ,就需要能够根据波形的振幅自动地改变放大电路的增益。一种方法是用AGC电路 ,用硬件来直接实现。这种方法增益变化速度快 ,但是增益调整范围有限 ,功耗大 ,且成本高 ,调试复杂 ,一般应用于宽带信 In many signal acquisitions, we are not concerned with the absolute magnitude of the signal, but with the relative relationship, the waveform. In this case, it is necessary to be able to change the gain of the amplifier circuit automatically according to the amplitude of the waveform. One way is to use AGC circuitry, implemented directly in hardware. The gain of this method changes rapidly, but the gain adjustment range is limited, power consumption, and high cost, debugging complex, generally used in broadband