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# How to compare the size of an inverter and two cascaded inverters?

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##### Member level 5
What do u mean by size of inverter!

When we say it is a minimum sized inverter with size = H= 1 !

What do we mean?

Plz detail abt it

Thx

I guess it is the width of transisters used inside the inverter!

But if I want to compare 2 inverters....

1 with size H = 50 ( say)

Now Other 1 is an inverter made up of two cascaded inverters x and y!!

Now to compare ..

Should i follow

H = x+y?

Where H = size of inverter

X,Y = size of cascaded inverters!

I want to compare p/f of H with (X&Y!)

Size of inverter?

normally i use W/L as the size of transistor or inverter... W = width, L = length.

so min size means in 65nm technology node, L = 65nm and W is to follow the design rule speicified min width (i forgot this

if you have two parallel connected transistors and u wan to match with a single inverter, and assume u want the same L, you need to make the width of the two parallel transistors half the size of the single transistor so they have the same resistance as the equivalent single transistor.

I am not sure about how the two cascaded inverters connection (you mentioned) so too diff for me to visualize. u might need to draw it out....

regards
sp

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