运算放大器锁零电路分析及其改进

Analysis of Zero-locked Circuit of Operational Amplifier and Its Improvement

  • 摘要: 分别介绍了目前常用的由NPN型BJT和由N沟道JFET构成的运算放大器锁零电路的工作原理;针对N沟道JFET运算放大器锁零电路的弊端提出了相应的改进方法,即将控制回路中的二极管改为电阻以方便维修,将N沟道JFET改为P沟道JFET以简化计算机锁零控制电路;最后指出采用继电器进行运算放大器锁零可以消除残余电压。

     

    Abstract: Working principles of existing zero-locked circuits for operational amplifiers composed of NPN BJT or N channel JFET were introduced separately and corresponding improvement methods were proposed for shortcomings of zero-locked circuit with N channel JFET,namely the diode could be replaced by a resistor for convenient maintain and N channel JFET could be replaced by P channel JFET for simplifying control circuit of computer locking zero. Finally it was pointed out that remaining voltage can be eliminated by use of relay in zero-locked circuit of operational amplifiers.

     

/

返回文章
返回