leakage currents in cmos inverter

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strangesiva

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Hi ,
Can you please exlain me where the reverse biased diode leakage occurs and please give me an explanation about the path of the reverse current ,as to how it flows and when the leakage stops . And similarly please explain me about sub treshold leakage current too
 

As you know for increasing the speed of inverter , it is a good idea to decrease the threshold voltage (because the resistance of the transistor in the triode region decreases).
When you decrease the threshold voltage , the transistors wont cut off.so there will be a leakage current.
 

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