travel_2_electronics

Short channel device: A device is said to be short channel if it has following properties: A device is called a short channel if its channel length is <1µm. If the channel length is in the order of depletion region width at source and drain junction it is a short channel device. If the channel length is in the order of junction depth. Reasons for Short channel effect: High electric field: As the channel length is less, the electric field between source and drain is high. V t variations: The source and drain is already depleted and has to be considered as their junction depth is the same channel length. So V GS for channel formation gets reduced as the depletion region of source and drain helps is pre - existence of channel before applying V GS . Short channel effects: Channel length modulation: When V DS > V GS – V t the pinch off moves towards source from drain due to this the depletion width of drain keeps increasing in a manner that the whole channel is occupied by the de...