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+======Physiologist's Friend Chip design======
+The [[http://www.ini.uzh.ch/~tobi/friend|Physiologist's Friend Chip]] is a tool for educators and physiologists that electronically models the early visual system. This page holds the design of the friend23 chip, which is the most recent design dated 2001.
+{{physiofriendlayout.jpg?w=400|Layout of friend23}}
+Layout of the Friend23 design. Die size is 2.2x2.2 mm and the photodiode sizes are about 163um wide and 190um high.
+=====Downloads=====
+  * {{physiofriendschematics.pdf|Schematics of friend23}} - transistor W/L dimensions are in lambda with lambda=0.8u.
+  * {{physiofrienddesign.zip|Archive of design}} - this design was done in [[http://www.tanner.com/eda|Tanner tools]] and fabricated in the 1.6um AMIS process from [[http://www.mosis.com|MOSIS]].
+=====Credits=====
+The PhysioFriend chip was designed by members of the Inst. of Neuroinformatics, including Elissabetta Chicca, Simon Bovet, Tobi Delbruck, Shih-Chii Liu, Giacomo Indiveri, and others.
+=====Licence=====
+We provide this design as a contribution to the neuromorphic engineering community. By using these design resources, you agree to the following terms:
+These designs are distributed under the terms of the GNU Public License (http://www.gnu.org/licenses/licenses.html - TOCGPL), with the following additions:
+   - You are responsible for any use of these resources that infringe on existing patents. (We are not aware of any such existing IP.)
+   - We have built these circuits on several chips and they function correctly, but chip design is a tricky business, so there is absolutely no warranty as to functionality of these circuits.
+   - **Use of these resources on chips that result in publications or for use in courses on electronic design must cite our relevant [[http://www.ini.uzh.ch/~tobi/publications.php|publications]] and must acknowledge the [[http://www.ini.uzh.ch|Institute of Neuroinformatics]] **. For this chip, the publication is \\
+T. Delbruck, S.C. Liu. (2004). [[http://www.ini.uzh.ch/~tobi/friend/delbruckPhysioFriendVisionResearchV44I17.pdf|A silicon visual system as a model animal]]. Vision Research, vol. 44, issue 17, pp. 2083-2089