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Some general FB for lab 1 that might help improve the quality of the report for lab 2...
- Answer all explicit questions and try to answer the implicit ones as well. Example: "Are there any deviations that indicate that there are some effects that the EKV model does not model?"
- Follow all instructions! Example: "Enter the parameters into the EKV matlab function (You’ll find it under ’resources’ on the course page) and plot the result together with your measurement to verify your match." So plot the graphs together, as instructed!
- Give all necessary information to enable replication of your results. Some of you did not mention the value of V_DS for the I_D vs V_GS plots. And vice versa only specified "strong inversion" for I_D vs V_DS plots instead of also explicitly giving the value used for V_GS.
- Make figures readable! Use big enough labels (In Matlab, for example: set(gca,'fontsize', 14). Label the axes (use 'xlabe...
Yesterday night (somewhat surprising to me) the rh7login.ifi.uio.no cluster got retired. Please use nano.ifi.uio.no to run Cadence instead. The lab-guide will be updated accordingly shortly.
Note that the waveform generator cannot produce any sine waves with higher frequency than 60MHz! The script text in the lab description tries to go up to 100MHz.
If you download the latest version of MFG_SetSine.m, this is checked when you execute the function.
Please re-download the matlab script GainAndPhase.m. It's a new version. The old contained a copy-paste error that caused wrong results when input x and y had different offsets.
The automatic frequency sweep ran into trouble: you have to adapt the time base of the oscilloscope to the frequency to get a meaningfull recording to determine the phase. A new function [ok] = MDO_TimebaseScale(h,scale) is provided and inserted into the example loop given in task 2. This should save the issue.
Also note the update of a 'pause' command in the matlab script provided in the lab text!
The lab 2 PDF has just been replaced with an updated version. Please download again.
It's but a small change, mentioning the Matlab commands 'semilogx' and 'hold on/off', that can help to plot Bode plots.
Use the oportunities to talk to companies situated in Oslo that may be future employers! Check out the information here:
https://www.mn.uio.no/fysikk/studier/aktuelt/arrangementer/2025/industry-day-in-the-elite-study-program.html
Be aware that ther is a power outage planned for OJD tomorrow Thu 27-Feb 21:00 to 24:00. The building will be closed and you cannot work in the lab!!!
The power supply's 3rd channel can only supply 5V. Since you will most conveniently supply power to the IC (pin 14) from that channel, you cannot use 10V. So let's just use 5V instead.
P.S: Background explanation: 1) You need a seperate channel for pin 14 from the one providing the drain voltage, since you want to measure the current going to the drain accurately. 2) Pin 14 is also used for protecting any input against voltages higher than Vdd, so it needs to be the highest voltage on the chip too. So using 10V on the drain and only 5V on pin 14 would not work either...
All 2024 videos are now available without an extra step to approve access here:
https://uio.cloud.panopto.eu/Panopto/Pages/Sessions/List.aspx#folderID=%22925a0918-e350-49ad-ad68-b28100cae647%22
You can also navigate ther from the semester page clicking on 'Videomappe, lenke til videomappe i Panopto -> 2024_podcasts'
some of you discovered that you do not find the drive m: on the lab machines (while you DO find it on the 'Lab Net Workstation' as well as on Linux on ifi Workstation and rh7login.ifi.uio.no as /hom/<username> )
This can be rectified via a very circuitous route:
On the lab Windows computer:
1) Start the program 'Firmaportal' or 'Company Portal'
2) In 'Firmaportal' find 'UiO Legacy Home Drive' and install/run it.
3) Now you DO have access to your home drive, but seemingly not as drive m:. Instead you have to click on 'This PC' and you'll find it as 'Nettverkplasseringer -> Home Drive'
So now you should have a drive that you can access from all machines at UiO, Linux or Windows. If you work from home, you will not have access to it directly from your home machine though. For that you can open Omniss...
It appears that students from 2025 do not get automatic access to the podcasts from 2024. For now, as you try to access a 2024 podcast, I get a notification and have to approve access individually for each video and student. So there will be delay. Sorry for that!
In the meantime I am investigating how to rectify that and automatically grant access to all students and all 2024 videos. Let's hope this can be done!
Unfortunately the podcast of the 21-Jan lecture is without sound, or more precisely with just noise on the audio track. Please read the compendium on the subject of 'large signal models' if you have not been to the lecture, or have a look at last year's recording of approximately the same content (we got through a bit more stuff then) here: https://uio.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=466b46cc-4c35-4c80-9b0f-b0f900da9b91
Due to some sick days and issues with lab software, the labs will start in the first February week, i.e. a week later than originally indicated on the web-page.
I have updated the compendium to edition 1.1, now downloadable for logged in students from Leganto.
Notable addition: appendix C with Matlab code for EKV model.