In dummies connection can I connect the gate with source to ground without the drain

[kah89]

Hi

In dummies connection can I connect the gate with source to ground without the drain.

because I have the drain of this dummy connected to another transistor which is not connected to ground

Thanks

 

[dick_freebird]

If the drain is connected to something "live", is it
really a dummy?

 

[kah89]

I have a specific transistor which is 5 fingers and I made it 7 for the dummy and the dummy is shared in drain with the transistor and the drain of the transistor is connected to something "live" so I am stuck at this point.

Is there another way to make the dummy in this case?

 

[dick_freebird]

Maybe go to N+1 fingers, and N/(N+1) W? Or N-1, N/(N-1)?
Of course if you care about dummies you probably are
matching the W, L to some number of other FETs and this
could ripple outward....

But you want to be able to put source at both ends of the
rack so your dummy can be S-G-S tied off. Odd numbers
of fingers don't work out so well for that.

 

[rangermad]

You shouldn't have any problem tying off the gate of dummy transistors to the appropriate supply to turn them off. Connecting the source is optionable.