Second , the theory of sub - block circuits which include bandgap voltage reference , over temperature protection , output over voltage protection and input under voltage protection was analyzed and these sub - block circuits were simulated using hspice 在设计子电路模块时,主要分析了以下四个模块:带隙基准电压源、过温保护电路、过压保护电路和欠压保护电路。
In the passive circuit part , according to the theories of microstrip line and coupled microstripwe , the characteristic of microstrip and coupled microstrip was analyzed , the x band filter and dc block circuit of amplifier have been designed by hp - ads software 为毫米波设备提供本振源。在无源电路部分,我们首先对微带线、耦合线等基本理论作了简单的介绍。
First of all , the whole chip function diagram is designed after analyzing the principle of charge pump and the system required function . and then , the sub - block circuit is designed according to the whole chip function and structure 通过对电荷泵dc / dc转换器的基本原理和系统功能的详细分析,论文首先介绍了整体结构,然后重点介绍了作者所负责的部分子模块电路。
Further , the characteristics such as the response speed , the efficiency and the relationship between load and the modulation factor are counted and analyzed . during the stage of circuit design , the whole chip and the sub - block circuits are well - designed , respectively 基于此模型,计算并分析了离散脉冲频率调制下升压型dc / dc变换器的响应速度、效率和负载与调制度的关系等特性。
The system exhibits fast response for the load current disturbance and the system always operates at discontinuous conduction current mode so that no slope compensation is required and high efficiency will be achieved when driving 4 leds . the design and analysis of sub - block circuits are provide in the thesis where band gap reference , oscillator , current sensing and over current protection , led load current 本文完成了各个单元电路的分析与设计,着重分析了带隙基准源、振荡器、采样和过流保护、负载led电流控制和开负载保护五个子电路,对其余子电路也作了简要分析。