It mainly contains chip circuit and the periphery circuit of it , power circuit , speech input circuit , speech output circuit , debugging circuit and rs232 circuit 包括:芯片及其外圍電路、電源電路、語(yǔ)音輸入電路、音頻輸出電路、系統(tǒng)調(diào)試電路、串口通訊電路等。
Based on the charge pump principle analysis and circuit design in the beginning chapters , the author simulated all the sub block circuits and whole chip circuit by applying eda tools hspice and viewlogic 在完成電路原理分析與電路設(shè)計(jì)的基礎(chǔ)之上,還應(yīng)用eda軟件hspice對(duì)各個(gè)子電路模塊和整體電路進(jìn)行了功能仿真及量化模擬。
Based on that , the author simulated most of the sub - block circuits and whole chip circuit by applying eda tools hspice . the simulation results indicate that the ic has achieved the expectation , 理論分析、仿真結(jié)果和芯片測(cè)試數(shù)據(jù)表明,在典型情況下,該電路的電流控制精度相對(duì)誤差和匹配相對(duì)誤差可以控制在0 . 5 %以內(nèi),達(dá)到了預(yù)定設(shè)計(jì)目標(biāo)。
The author pays more attention to the analysis and design on the following sub - circuits : oscillator , comparator , hysteresis comparator , chip enable , etc . on completing the principle analysis and circuit design , the sub - circuits and whole chip circuit are verified with the eda tools hspice 其次在電路設(shè)計(jì)中,作者基于升壓型dc / dc變換器和離散脈沖頻率調(diào)制方式的基本原理并根據(jù)電路功能的需要,進(jìn)行了控制電路的總體結(jié)構(gòu)設(shè)計(jì)和子電路模塊設(shè)計(jì)。
Consequently , an integrate switch mode power supply with high efficiency and good reliability can be realized by the controller with very few external parts . the fundamental principle of monolithic voltage - mode switching regulator is firstly introduced in this thesis , which is followed by a comparison between voltage - mode and current - mode converters where the pros and cons of both converters are discussed in detail ; next , the global system architecture is proposed upon the design requirements and sub - block circuits are also introduced that focuses on several essential sub - blocks such as amp , wave , pwm control , psc , osc and vref . finally , all sub - circuits and the whole chip circuit are simulated by hspice whose results indicate that the circuit function and performance have perfectly satisfied the design requirements 在論文中,首先闡述了電壓控制模式pwm開關(guān)電源的基本原理,對(duì)比了電流控制模式和電壓控制模式,分析了各自的優(yōu)缺點(diǎn);隨后根據(jù)設(shè)計(jì)要求進(jìn)行了電路的總體設(shè)計(jì),完成了各個(gè)子電路的原理分析,電路設(shè)計(jì)和仿真驗(yàn)證,重點(diǎn)闡述了誤差放大電路、三角波發(fā)生電路、 pwm控制電路、節(jié)能控制電路、振蕩電路和基準(zhǔn)源電路的分析、設(shè)計(jì)和驗(yàn)證過程;最后,利用eda軟件hspice對(duì)整體電路進(jìn)行了功能仿真驗(yàn)證,仿真結(jié)果表明,本文完成了設(shè)計(jì)工作,達(dá)到設(shè)計(jì)要求。