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Does a diode in bandgap needs a dummy ?

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surianova

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diode in bandgap

hi all!

is it important for diode in bandgap with 8:1 ratio for common centroid to have dummy surround it? for resistor of course we put dummy. How about diode?
 

Re: diode in bandgap

surianova said:
hi all!

is it important for diode in bandgap with 8:1 ratio for common centroid to have dummy surround it? for resistor of course we put dummy. How about diode?
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Usually I use bipolar transistors as diodes without dummy elements.
 

diode in bandgap

about the matching, dummy element there are a lot of tricks and myths. but many people say many times they are not so useful, anyway if I have to make layout I ususally use them (maybe don't help, but it is not adverse, but I guess the truth is not so many difference with or without dummy cell).
 

Re: diode in bandgap

usually i use it to match the 1:8 bipolar(around them) transistor,but it takes some area indeed,
 

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