High!

Category: , , By Rachel
I decided to write a post tonight because i'm on a bit of a high. I just got a big part of my ASICS2 project done. I have to design a 6-bit binary weighted DAC that has to have a minimum of 1V output with an LSB value of 20mV i.e. the maximum output should be (20mV)(2^6) = 1.28V (or 2.28 since the minimum is 1v). Anyway when i say i have a big part of it done, i've been using an ideal VCVS opamp model instead of a designed one and it works with this. Now i just have to make my own opamp and stick this in instead of the VCVS one.

This has been a pretty busy week. On Wednesday i had my FYP presentation and demo, but we didn't get a chance to actually demo our robot because the batteries died! So we're going to demo it to the supervisors tomorrow instead. I think it'll just be a matter of showing up, letting the robot run around and showing how it reacts to various situations like obstacles etc. To be honest i have no idea what the supervisors think of our work, it's really hard to gauge. We have put so much work into this thing that it'll be really depressing if we dont get an A or a high B at least.

Speaking of depressing, i got the result for my opamp design for Analouge Design back. I only got 28.5 out of 40?! The opamp worked and i simulated all the conditions so i have no idea why this result is so bad! I'm looking at the sheet he gave me back now and i don't understand his marking sheme. He doesn'g give numeric marks, he just writes "good" or "average" etc. In the comments he wrote "why is power dissipation given in dB?"...why am i getting docked marks for this? I could have given it in mA but didn't realise that it had to be so specific. In fairness, i did omit a few calcluations (like PSRR, compensation cap etc), but surely that's not worth 12.5%!!!! I'm really upset about this. I wanted to get an A1 or A2 in this module and i hope this doesn't ruin my chance. I might talk to the lecturer tomorrow about it.

Wow i started out this post feeling really positive, now i just want to cry.
 

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