?? 微恒流源電路.ewb
字號:
Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description:
"基本恒流源電路圖"
" 對恒流電路的主要要求有:"
" 1、等效微變電阻要大。"
" 2、溫度變化時的穩定性要好。"
" 3、器件參數,正向壓降變化時,電流的恒定性要高。"
" 4、在特殊情況下,要求電流值可以控制。"
" 構成恒流電路的基本方法是利用三極管的集電極電壓對電流的影響小,再加電流負反饋提高輸出電流的恒定性,在必要時,還采用特殊電路進行溫度補償。"
""
" BG1和BG2的基極和發射極分別連在一起,所以兩管的VBE總是相等的。當兩管的參數相等時,它們的集電極的電流(即恒流源的輸出電流)與基極電流IB也是分別相等的。"
" 若BG1管的集電極電流Io就是恒流源的輸出電流,Ir是參考電流。改變Ir,Io就跟著變。Io如同Ir的鏡象,所以此電路叫做鏡象恒流源。"
EncryptionType: 2
UsingVectorGraphics: 0
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