You can measure the power consumption by measuring I(t) drawn from the power supply VDD, then you average the I(t) = Iaverage. You can calculate the avwerage power by Paverage= VDD Iaverage.

Best wishes

Hello Majid,

You can use the following command:

.measure tran power_avg avg power

With "power", hspice measures the total power consumption of the circuit, including VDD and the input voltages.

I suggest that you buffer the inputs with inverters to get more realistic results. Using voltage sources directly connected to transistor diffusions (in the case of pass transistor logic) will give you unrealistically low power/delay results.

Hi Majid

This power consumption code is a Full adder (3-input).

.tran 1n 200n

.MEASURE avg_pow AVG power FROM=1n TO=200n

.MEASURE TRAN t1 TRIG V(A) VAL = 0.4 RISE = 1

+ TARG V(Cout) VAL = 0.4 FALL = 1

.MEASURE TRAN t2 TRIG V(A) VAL = 0.4 FALL = 1

+ TARG V(Sum) VAL = 0.4 RISE = 1

.MEASURE TRAN t3 TRIG V(B) VAL = 0.4 RISE = 1

+ TARG V(Cout) VAL = 0.4 FALL = 1

.MEASURE TRAN t4 TRIG V(B) VAL = 0.4 FALL = 1

+ TARG V(Sum) VAL = 0.4 RISE = 1

.MEASURE TRAN t5 TRIG V(C) VAL = 0.4 RISE = 1

+ TARG V(Cout) VAL = 0.4 FALL = 1

.MEASURE TRAN t6 TRIG V(C) VAL = 0.4 FALL = 1

+ TARG V(Sum) VAL = 0.4 RISE = 1

.measure TRAN poweravg AVG power from=0 to=60n

.measure TRAN staticpower0 AVG POWER FROM=0n TO=10n

.measure TRAN staticpower1 AVG POWER FROM=10n TO=20n

.measure TRAN staticpower2 AVG POWER FROM=20n TO=30n

.measure TRAN avgstativpower param='((staticpower0+staticpower1+staticpower2)/3)'

Hello,

Thank you so much, Dimitrios and Farzad.

You really helped me.

Best Regards.

You can measure the power consumption by measuring I(t) drawn from the power supply VDD, then you average the I(t) = Iaverage. You can calculate the avwerage power by Paverage= VDD Iaverage.

Best wishes