摘要
系统中绝对值电路含悬浮二极管,阻碍了片上集成。为此,另辟蹊径用运放构成无二极管绝对值电路。PSpice仿真表明,运放OPA365构成的无二极管绝对值电路与理想电路输出电压的幅值误差较小,最大仅为0.7%;在零电平附近的幅值误差<12mV,相位误差可略。因此,内部结构合理的轨到轨运放构成无二极管绝对值电路,其幅值误差可望<0.7%。其片上集成后,可用于笔者"AC-AC变换"项目及电气测量。
In our system, the absolute value circuit with diode whose pins are floated, it makes the circuit can＇t be integrated on chips. To solve this problem, an alternative way is to adopt operation amplifiers to form absolute value circuit which have no diodes. Pspice simulation shows , the amplitude error of the circuit containing the operation amplifiers, OPA365, is very small, only 0. 7 % compared with the ideal case; its amplitude error around the zero voltage level is less than 12 mV and the phase error can be ignored. Accordingly, the absolute circuit without diode will achieve less than 0. 7% amplitude error with the rail-torail operation amplifiers which have the proper structure. The new circuit implemented with on-chip integration is expected to be applied in the research of our project. ＂transformation of AC （Alternating Current）-AC＂ and in the field of the electrical survey.
出处
《电子器件》
CAS
2008年第4期1144-1146,共3页
Chinese Journal of Electron Devices
基金
AC-AC升降压SPAWM电子功率变换器(A.10-0109-06-027)
