How to calculate power consumed by an IC

[calculus_cuthbert]

Hi,

I had a very simple question regarding power consumption calculations of an amplifier.

When the power consumption of an amplifier is stated in a data sheet how is it calculated?

Is it Irms ( drawn by the circuit) multiplied by supply voltage?

Thanks

 

[eladla]

What I do to measure (and I`m guessing this is the most common way) is put a 1 (or 10 or 100) ohm resistor inline with the Vdd power
supply and measure the current through it and use the power equation.

 

[JoannesPaulus]

for power consumption calculation, you can take the average of the current into the amplifier supply pin (use a 0V vdc in series with that pin) and multiply by your voltage supply.