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widlar current source

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rameshbalan

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the main thing of the all current sources to get constant current.in wilson and normal sources, output current of the current source is equal to reference current. but in widlar it is not like that,output current less than the reference current. so what is the advantages of widlar current source over all current sources.
 

It allows you to generate a low output current without using high value resistors.
 
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