运算放大器的应用与T形电阻网络

Operational Amplifier's Applications and T-shaped Resistance Net

采用通用运算放大器进行电路测量、放大电路等的设计时 ,常常需要较高的放大倍数或按一定的要求调整其放大倍数 .针对实际应用中存在的这些问题 ,对T形电阻网络在运算放大器电路中的应用进行了实际测试 ;根据对试验结果的分析 ,得出了两种有实用价值的电路———采用T型电阻反馈网络的放大电路和由数字系统控制电压增益的运放电路 .该电路通过模拟开关可以很方便地与数字电路联系起来 ,完成显示放大倍数等要求 。

While designing electronic circuit to measure and amplify,we often want higher voltage amplification factor or change the voltage amplification factor according to certain requirement.Traditional way can not satisfy its requirement.Based on practice the application of T-shaped resistance net in operational amplifier's circuits are analysed.Faced to problems existed in practice,we have a discussion and a aimed test.According to the analysis of testing result,reach the two circuits of having practical value one operational amplifier's circuits feedback network by the T-shaped resistance the others voltage gain be controlled by digital system have been designed. They are easily connected analogue switch with digital circuit and satisfy other requirement.These operational amplifier's circuits have certain worth to use.