通用恒压电路.ewb

Multisim2001软件的仿真电路实例261例

Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"通用恒压电路图" 
"        在集成电路内部，往往需要建立低内阻点，以作为内部电压源。对这种电压源的要求是：" 
"        1. 等效微变电阻要低。" 
"        2. 直流电压对温度不敏感。" 
"        3. 对器件参数变化不敏感。" 
"        4. 有些情况还要对电源供电电压不敏感。" 
"        实现恒压的方法有：在电路中利用二极管工作与击穿状态；采用温度补偿，引入电压负反馈。" 
"        图中用晶体三极管的发射结替代二极管VD，作为温度补偿二极管。晶体三极管接成电压负反馈电路，使得输出电阻进一步减小，具有更高的稳定度。VDW为工作于击穿状态的二极管，称为稳压管。" 

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