Help me about matching...

[Sidramareddy]

Q:Which type of matching technique is good for Resistors, Capacitors & BJT's....? n plz tell me the reason behind of choosing it....

 

[dgnani]

do you mean for layout or design?

 

[Sidramareddy]

In Layout...

 

[dgnani]

In no particular order, a probably incomplete list:

- Common centroid to have first order compensation of process gradients

- same orientation, reduces sensitivity to non-planarity in process steps

- same surrounding (use dummies, similar connections, avoid close conductors mismatches), to limit the second order effect coming from other implants and stresses around the device

- proximity, to avoid long range variations

 

[Sidramareddy]

which matching technique is good for BJT's???

 

[dgnani]

all of them, keep them close, with the same orientation, organize them in a common centroid geometry and add dummies

 

[Sidramareddy]

Thanks a lot...