【正文】 nd resistance to noise performance of with the accuracy and performance of the entire circuit system. The accuracy of the system to a large extent depends on the begin is accuracy of the internal or external reference, there is no one to meet the requirements of the is reference circuit, it can not correct and effective system of preset performance. The purpose of this paper is based on bipolar transistors reference TL431 adjustable voltage regulator IC is simulation and analysis. At the beginning of this article, first introduced the development status and trends of the reference voltage source at home and abroad. And then details the basic structure of the reference voltage source circuit and the basic principle, and several different bipolar voltage reference circuit with a simple introduction. Second, the circuit simulation software mulisim .Finally, the circuit simulation software specture TL431 series integrated voltage regulator reference circuit simulation and detailed analysis of the results. Simulation analysis of the main types of DC operating point analysis, AC analysis, Fourier analysis, noise analysis, noise figure, distortion analysis, DC sweep analysis, sensitivity analysis, Parameter Sweep analysis, temperature scanning. Simulation and analysis of simulation results show that the voltage reference circuit has a high stability of the DC voltage source output level is relatively stable, and the DC level is not sensitive to the supply voltage and temperature. Keywords: reference voltage source ,the TL431 ,simulation ,Specture ,temperature coefficient 3 目 錄 1. 緒 論 ...................................................................................................................................... 5 國內(nèi)外研究現(xiàn)狀與發(fā)展趨勢 ................................................................................... 5 課題研究的目的意義 ............................................................................................... 7 本文的主要 內(nèi)容 ......................................................................................................... 7 2. 基準電壓源電路和偏置的電流源電路 ................................................................................ 8 基準電壓源的結(jié)構(gòu) ........................................................................................................ 8 直接采用電阻和管分壓的基準電壓源 ............................................................ 8 有源器件與電阻串聯(lián)所組成的基準電壓源 ..................................................... 9 雙極型三管能隙基準源 ................................................................................... 11 雙極型二管能隙基準源 ................................................................................ 13 BEV 的溫度特性 ........................................................................................................... 14 對溫度不敏感的偏置 ................................................................................................ 15 對電源不敏感的偏置 .................................................................................................. 19 本章小結(jié) .................................................................................................................................... 20 3. 高精度可調(diào) 式精密穩(wěn)壓集成電路 TL431 的工作原理與運用 .......................................... 22 精密穩(wěn)壓器 TL431 的內(nèi)部結(jié)構(gòu) .................................................................................. 22 TL431 的工作原理與參數(shù) ........................................................................................ 22 TL431 的具體工作原理 .................................................................................. 23 TL431 的特點和參數(shù) ...................................................................................... 26 TL431 的典型運用電路 ............................................................................................ 27 基準電壓源電路 .............................................................................................. 27 恒流源電路 ...................................................................................................... 28 電壓比較器電路 .............................................................................................. 29 電壓監(jiān)視器電路 ................................................................................................. 29 TL431 應(yīng)用所注意的事項 ........................................................................................ 30 本章小結(jié) .................................................................................................................................... 31 4. 高精度可調(diào)式精密穩(wěn)壓電路 TL431 的仿真 ...................................................................... 32 4 Candence 以及 Specture 仿真器的介紹 ...................................................................... 32 整體電路的仿真 ........................................................................................................ 32 直流 特性 仿真 .................................................................................................... 32 瞬態(tài)特性仿真 ..................................................................................................... 34 溫度特性的仿真 ................................................................................................. 35 電源抑制比仿真 ................................................................................................ 36 開環(huán)電壓增益仿真 ............................................................................................. 36 應(yīng)用電路的仿真 ................................................................................................ 37 本章小結(jié) .................................................................................................................................... 39 結(jié)論 ............................................................................................................................................ 40 致謝 ...................................................................................................