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URGENT. Help on Power of Inverter.

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karthiga05

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Hi everyone. there is usually no power consumed in an inverter. Bt im required to find out a condition that allows an inverter to consume power. does anyone of u knw the condition? Thanks in advance! inverter.jpg
 

if logic '1'is being applied, a logic '0' is what comes out and vice versa. power is not consumed when both of this conditions are applied. i would like to knw what is the condition required for power to consume.
 

This circuit configuration can consume two type of power;
1. DC power, which will be consumed due to leakage current flow in FETs;
2. AC power when you operate it to high speed, as I can consume more current during transistion phase from one state to other with both the switch "ON" for very short duration.
 
hi. can i knw if i am right to make such a statement? - 'Vin ≥0.7V then Vout = 0V ; logic ‘1’ becomes logic ‘0’ ' thanks! based on the picture above.
 

karthiga05 said:
hi. can i knw if i am right to make such a statement? - 'Vin ≥0.7V then Vout = 0V ; logic ‘1’ becomes logic ‘0’ ' thanks! based on the picture above.
Click to expand...

it is depend on gate threshold voltage ratings of switches used.
 

karthiga05 said:
hi. can i knw if i am right to make such a statement? - 'Vin ≥0.7V then Vout = 0V ; logic ‘1’ becomes logic ‘0’ ' thanks! based on the picture above.
Click to expand...

You can't really say this for certain, even if by 0.7 you mean the threshold voltage. You need to look at your inverter's "voltage transfer curve" as it's called on the wikipedia site:

https://upload.wikimedia.org/wikipedia/commons/8/81/Inverter_voltage_transfer_curve.png

This gives you the relationship of Vin to Vout. You'd need to run a SPICE simulation for this, since the curve is very dependent on transistor geometries.
 

2. AC power when you operate it to high speed, as I can consume more current during transistion phase from one state to other with both the switch "ON" for very short duration.


Not only for "high speed" operation. Each time the circuit changes its state (from high to low and vice versa) the circuit consumes power during the switching period.


 

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