Transistor Matching Concepts

[VLSI Bravo]

can anyone help me to get a clear cut idea of matching concepts (interdigitized and common centroid) with examples.

any documents or book to go through...

thanks in advance.

 

[kenambo]

Hi..

you can study a lot about matching through googling.. anyways refer these books..

Art of Lyout by A.Hastings
Cmos ciruit design,simulation and layout by Jacob R. Baker

refer these PDF's too

 

[Dominik Przyborowski]

Books:
1. Alan Hastings "Art of analog layout"
2. Baker, Li, Boyce "CMOS circuit, design, layout and simulations"

Articles:
Any papers about current steering DACs, e.g.:
1. C. Bastiaansen, D. Groeneveld, H. Schouwenaars, H. Termeer "A 10-b 40-MHz 0.8-um CMOS current-output D/A converter." IEEE Solid State Circuits, vol. 26, no 7, 1991, pp 917 - 921

But in briefly example of two transistors:
1. Interdigitized:
ABAB
2. Common centroid:
ABBA

In common centroid the transistors placement is around one point of symmetry, while in interdigitized are alternately (layout of multifinger fet is a good example)

 

[VLSI Bravo]

thank you dominik and kenambo

 

[VLSI Bravo]

hi guys, a help in transistor matching,
common centroid matching for 5 devices
A=4, B=256, C=20, D=20, E=640

can any one match this devices in correct pattern, hope for a soon reply

 

[VLSI Bravo]

hi guys, a help in transistor matching,
common centroid matching for 5 devices
A=4, B=256, C=20, D=20, E=640

can any one match this devices in correct pattern, hope for a soon reply

i am expecting some help guys

 

[Dominik Przyborowski]

If You won't try by yourself, You will never learn ;-)
If You make a 31x31 matrix, a A device should be at corners, C and D 5 per quadrant, B every 4 devices and rest place for device E and dummies.