week13 - Electromigration Long-term reliability problem If...

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Advanced Interconnect technique Reduced –Swing Circuit av swing L p I V C t = so to reduce t p instead of increasing I av we can reduce V swing disadvantage smaller noise margin need amplifier at the receiver end reduced swing circuit are need for *address bus of μ-processors *data lines in memory array receiver is called sense amplifier V DDL V DDL C L Receiver (sense-amp) Driver
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Static reduced swing network acts as differential amplifier just two inverter as receiver is too slow since *0 V DDL signal cannot turn on NMOS completely so HL transition slow *PMOS does not turn-off therefore increased static power consumption and even slower HL transition Disadvantage : need two power supplies Advantage : cross-coupled PMOS - output is restored to VDD positive feedback accelerate the transition Avoids second supply Vswing = V DD -2V T Sensing delay is small as two inverter delay V DDL V DDL Driver Receiver Out C L out V DD V DD V DDL V DD V DD V DD V DD V DD -V Tn V DD -V Tn C L Position of NMOS and PMOS is reversed Swing lV Tp l V DD -V Tn Out
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This note was uploaded on 02/19/2012 for the course ECE 456 taught by Professor Mohammadi during the Spring '09 term at Purdue University.

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week13 - Electromigration Long-term reliability problem If...

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