在智能仪器仪表中,如果测量的范围比较宽,为了保证必要的测量精度,常采用改变量程的方法。改变量程时,测量放大器的增益也应相应地加以改变。这种变化最好能自动完成,即不需要人为地改变电路连接,而是通过软件实现放大器增益的改变。这样,就可以实现仪器量程的自动切换。因而,程控增益放大 In the smart instrumentation, if the measurement range is relatively wide, in order to ensure the necessary measurement accuracy, often use to change the range of methods. When changing the range, the gain of the measurement amplifier should also be changed accordingly. This change is best done automatically, that is, without the need to artificially change the circuit connection, but through the software amplifier gain changes. In this way, you can achieve automatic switching instrument range. Thus, programmable gain amplification