Power and Energy ·Circuit level view -dynamic(transistor switching),short circuit,leakage current P=Pan +Pe+Pu =0.5CLVDD Af +IsV DDA+IRVDD Voo:supply voltage; CL:node capacitance; Capacitive(Dynamic)Power Static (Leakage)Power Vdd f.clock frequency; A:activity factor: n Vout Isc:Short circuit current; lIk:leakage current .Dynamic power is the dominant source now. .Static power is growing faster Higher Architecture level view -Datapath Power,Memory System Power,Bus Power,etc llxx@ustc.edu.cn 9/62Power and Energy • Circuit level view — dynamic (transistor switching), short circuit, leakage current dyn sc lk L DD sc DD lkVDD P  P  P  P  C V Af  I V A  I 2 0.5 VDD: supply voltage; CL: node capacitance; f: clock frequency; A: activity factor； llxx@ustc.edu.cn 9/62 A: activity factor； Isc：Short circuit current ; Ilk: leakage current • Architecture level view —Datapath Power, Memory System Power, Bus Power，etc •Dynamic power is the dominant source now. •Static power is growing faster Higher