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What does Mult. means in a schematic?

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drabos

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Hello,

I saw many articles,... that they give a Mult. parameter besides the transistors's
W/L.

For example:
Tran.: M2 , W/L[um/um]: 6/2, Mult.: 40
Tran.:Mp, W/L[um/um]: 20/2, Mult.: 10360

So, what's this Mult. parameter means?
 

Multiplication factor - how many transistors are connected in parallel.
 

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    drabos

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So,for example the 10360 are the numbers of transistors? Isn't it too much?

Is it because of matching?
 

what is the meaning of matching?
 

In my nomenclature: matching is the following:

For example:
You have to use 2 resistors which ratio has to be very accurate. For example: 1:20
Then you use 21 equal resistors. Then it will be better than you use a resistor and a 20 times bigger resistor.

I hope I was understable.
 

in this multipliers means the given W/L transistors 40 should be connected in parallel
 

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    drabos

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How can I simulate and handle the multiplication transistors?

I use :Cadence Virtuoso (to draw the schematic)+Affirma( Spectre, SpectreS,Spectre RF)

In the nmos and pmos transistor model I can't set the Multiplication.
I want to find the easiest way (and of course I want to lay down simultaneously when I design the layout these 30-40 parallel transistor )

Thanks,
 

it is easy for you to set the multiplication in cadence. the transistor has a m parameter, it equal to multiplication
 

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    drabos

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