Junus2012
Advanced Member level 5
Hello,
I am wondering why ABBA (also written as ABBA/BAAB) is preferable or used over ABAB , I see the second one has better dispersion
BAAB BABA
Secondly, I opened the IP cells from my foundry and I have seen that they only use two dimensional (also called cross coupled) for the differential pair transistors, and the rest of the circuit is layouted using simple one dimensional common centroid or interdegitized array.
I have noticed from the results I obtained in my work, that although having two diamentional array gives better matching, but increase the parastatic and degrades the dynamic performance of the circuit due to the complexity of wire routing
I would like to discuss with you on this
thank you in advance
best regards
I am wondering why ABBA (also written as ABBA/BAAB) is preferable or used over ABAB , I see the second one has better dispersion
BAAB BABA
Secondly, I opened the IP cells from my foundry and I have seen that they only use two dimensional (also called cross coupled) for the differential pair transistors, and the rest of the circuit is layouted using simple one dimensional common centroid or interdegitized array.
I have noticed from the results I obtained in my work, that although having two diamentional array gives better matching, but increase the parastatic and degrades the dynamic performance of the circuit due to the complexity of wire routing
I would like to discuss with you on this
thank you in advance
best regards