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the transistor sizing is done only to the width of the transistor not for the length, the length is fixed based on the technology. If it is 90nm then the length of the transistor is 90nm so it is fixed for the transistor in that 90nm technology no varying is done.
I t is not like that .. actually.... the basic digital blocks are designed with basic length,,,,
But if u need you can change length too... Example current mirror...
In current mirrors, the more appropriate current mirroring is achieved at particular lenght of the device... In that case we fix the length other than minimum size...
But, after fixing length for a current mirror, we just change the width or multiplier to get multiplication of current...
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