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need help...confusion in some questions

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samisyed

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helllo...
hope you fine...
can you reply me for that questions with good reasons?
q#1 why do we need input impedence of a transistor high for amplifiers?
q#2 why do we need input impedence of a transistor some times low in various applications?
q#3 how doping level effects our devices such as transistors?why we use different doping levels such as high,,low,,medium in transistors??

i will be very happy if you answer my questions...
thanks...
 
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