midterm2 soln

[Kris Pister]

are online at:
http://robotics.eecs.berkeley.edu/~pister/tmp/mid2

ksjp

[Ibrahim Awwal]

Thanks!

-Ibrahim Awwal

[Long Chen]

Thanks, the midterm solution was helpful!  Will you still be holding your Wed OH for any last minute questions?

-Long

Long Chen
(404)354-2977 / Loch...@berkeley.edu
UC-Berkeley  EECS and Economics

[Kris Pister]

Wednesday 12:30-1:30
Thursday 11-12.

ksjp

[Vipul Jain]

Hey Professor Pister,

Can you also post the solution for midterm1? I am not sure if they are on the website.

Thanks,
Vipul

[Rafael Send]

Hi-
A long time back I gave you my midterm 1 for a regrade on a few things.
Either you didn't give me any points back, or the update didn't get posted
to Bspace. I also didn't get the paper back...
Could you check what happened there?
Thanks

Rafael

[xe...@berkeley.edu]

Hi,

Is the final open book?

Thanks,
Juan Lara

[Elliot Kahn]

open book, open notes, calculators allowed (but not needed)



~~~
Ellio...@GMail.com

[Kris Pister]

Rafael -
There were two things that you wanted me to look at:
prob 3a: I asked for V_TH at 300K, then V_TH ln(10), and exp(60mV/V_TH).
You answered 400mV for the first part, and then for V_TH ln(10) you
calculated (correctly) that ln(10) is 2.3, and so you multiplied 0.4V by
2.3, and got the correct answer. Here's what I wanted on this problem:
I wasn't looking to see if you knew how to take natural logs and
multiply, I was looking to see if you knew why we talk about
60mV/decade. It's for precisely this reason that I don't allow
calculators on the first midterms - I want you to know deep in your soul
that V_TH ln(10) is 60mV, and derive it. So actually the second part of
the problem was a hint to help you solve the first part. If you couldn't
remember what V_TH was, then at least you should have known that V_TH
ln(10) was 60mV, and divided by 2.3 to get V_TH.
Sorry, no credit on this one.

prob. 4: You asked me to take another look, and notice that you did draw
the drain curves with a slight slope.
Drawing the IV curves for a MOSFET with lambda=0.05/V, and a 5V V_DS,
there should have been a 25% increase in the drain current across the
page. The note that I wrote was "more slope", meaning that I could see
the slope that you drew, but it wasn't nearly big enough.
So no points on that one either, sorry.

ksjp

[Kris Pister]

Arg! That wasn't meant to go to the whole newsgroup, sorry everyone
(and especially sorry to Rafael).

Well, since I'm spamming anyway: the final is graded and the grades are
posted on bspace. I'm working my way through assigning final grades
right now. They'll be up within an hour or two.

ksjp