大学物理 ›› 2017, Vol. 36 ›› Issue (9): 20-23.doi: 10. 16854 /j. cnki. 1000-0712. 2017. 09. 006

• 编者按 • 上一篇    下一篇

两种平衡电路———从经典到现代

申世璋   

  1. 北京大学物理学院,北京100871
  • 收稿日期:2016-10-29 修回日期:2017-02-21 出版日期:2017-09-20 发布日期:2017-09-20
  • 作者简介:申世璋(1930—),男,重庆市人,北京大学物理学院副教授,主要从事大学物理实验教学工作.

Two kinds of balance circuits—From classic to modern

SHEN Shi-zhang   

  1. School of Physics,Peking University,Beijing 100871,China
  • Received:2016-10-29 Revised:2017-02-21 Online:2017-09-20 Published:2017-09-20
  • Supported by:
     

摘要: 研究两种平衡电路,它可以统一解释电位计、电桥和运放电路等各种零电路. 用于运放以后,平衡电路可以克服经典应用时的局限性,特别是它能使平衡电路自动地、瞬时地达到平衡,并且能处理从直流扩展到包括低频、高频的交流信号.

关键词: 平衡电路, 电位计, 电桥, 运算放大器, 对偶电路

Abstract: Two kinds of balance circuits are studied. They can explain various null circuits from a uniform view, such as potentiometer,Wheatstone bridge and operational amplifier. The usage on operational amplifier can overcome the limitation of classic amplification of balance circuit. Especially,it makes the balance circuit reaching equilibrium automotccally and immediately,and can treat the signal form DC to AC,including LF and HF.

Key words: balance circuit, potentiometer, Wheatstone bridge, operational amplifier, duality circuit