【摘要】 根据工程应用中对小信号放大的需要,结合模拟电子技术和单片机技术,设计实现了一种数控高增益测量放大器。根据预置的电压放大倍数合理分配第一级、第二级的放大量,实现了步进为1的1~1 000的放大倍数预置和显示功能,同时实现输出共模电压反馈至电源公共端,使运放电源电压随共模输入电压浮动等改进措施提高了放大器的共模抑制比,实现了一种方便实用的数控高增益测量放大器。更多还原

【Abstract】 Based on the needs of amplifying low signal during engineering applications,using analog electronic technology and single chip computer technology,this essay introduces a high gain instrumentation amplifier by digital control.On the basis of preset amplifier′s gain,distributes the first and second gains rationally,then realizes the gain from 1~1 000 in step 1 and displays the gains.At the same time improves the amplifier′s commonmode rejection ratio with several amelioration methods.Finally,a convenient and applied instrumentation amplifier by digital control with high gain is finished.更多还原