How can we calculate the DAC switching energy?

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U. Dreher

Sorry, what exactly should 'DAC switching energy' mean?

Generally, 'switching energy' is understood as the amount of energy required to change the voltage of capacitors: Δ(1/2*CU2)

Which is of little significance for a DAC as ΔU is not well-defined.

Does this help?

Mehdi Nasrollahpour

Hi,

Unfortunately it does not help. I am totally confused for calculating the dynamic energy consumption of switching from one logic state to the next logic state.

Regards,

Mehdi

The dynamic energy consumption is exactly the above: charging/discharging the parasitic capacitances. For CMOS implementations, your equations will hold a frequency component plus a VCC2 component. While the static energy consumption should be negligible. (OK - in the latest technologies the static consumption is rising again due to higher leakage currents while the dynamic consumption goes down with lower suply voltages and lower parasitic capacitances.)

The energy consumption in the DAC is proportion to the voltage change on the two different stage. Unfortunately the provided information you mentioned are so overall and superficial about the CMOS technologies. I need more specific answer.

Power consumption depends on the technology used. If it isn't CMOS, it would help if you could let us know which technology you're employing.

G.s. Vasantha Kumar

Well what ever the Technology you adapt. The change of state is rendered as charging of capacitor at the o/p stage. Hence power required is 1/2CV2.