基于动态性能空间理论的运算放大器正相反馈控制器设计  

Design of controller of non-inverting feedback operational amplifier based on dynamic performance space theory

作　　者：陈旭东[1] CHEN Xudong(Department of Mechanical and Electrical Information,Anhui Press and Publication Vocational College,Hefei Anhui 230601,China)

机构地区：[1]安徽新闻出版职业技术学院机电信息系,安徽合肥230601

出　　处：《阜阳师范学院学报（自然科学版）》2019年第1期56-63,共8页Journal of Fuyang Normal University(Natural Science)

基　　金：安徽省高等学校省级自然科学研究重点项目(KJ2014A103)资助

摘　　要：本文基于动态性能空间理论,对Op-Amp正相反馈控制器进行了研究。发现:若控制器采用正相并联电阻反馈网络形式,则所构建闭环系统中只有电阻比值k=R_2/R_1唯一可调,且当带宽频率仅增加至7.14×10~5rad·s^(-1)时,闭环系统即发生了振荡。为了在增加带宽频率的条件下提升系统控制稳定性,引入电容C作为另一可调参数构建了正相RC反馈控制器,并在特定设计目标带宽频率1.55×10~7rad·s^(-1)下,对该控制器参数进行了优化求解。结果显示:当RC反馈控制器中实数极点位于-3.7×10~6,复共轭极点位于(-1.1×10~7,±1.1×10~7),即电容C=2.47 pF,电阻R_1=1.02 kΩ和R_2=90 kΩ时,OpAmp闭环系统具有较好的动态性能和较强的抗干扰能力。Based on the dynamic performance space theory, this paper studied the Op-Amp positive phase feedback controller, which found that: if the controller adopted the non-inverting parallel resistance feedback network form, only the resistance ratio k=R2/R1 was uniquely adjustable in the closed-loop system constructed, and when the bandwidth frequency only increased to 7.14×105rad·s^-1, the system oscillated. In order to improve the stability of the control system under the premise of increasing the bandwidth frequency, a non-inverting RC feedback controller was constructed by introducing capacitor C as another adjustable parameter, and the controller parameters were optimized under certain bandwidth frequency conditions. The results showed that: when the real pole of the RC feedback controller was located at -3.7×10^6, and the complex conjugate pole was located at (-1.1× 10^7,±1.1×10^7), that was, the capacitance C= 2.47 pF, the resistance R1=1.02 kΩ and R2=9 kΩ, the Op-Amp closed-loop system possesses good dynamic performance and strong anti-interference ability.

关 键 词：动态性能空间 运算放大器 带宽 控制稳定性 直流增益 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]