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Electronics
MOSFET SubThreshold Slope Measurement Lab Using SPICE
MOSFET-Gm-Over-Id.7z Archive with this file included Run: Diode-Connected-FET-SubVt_Slope.asc Diode Connected MOSFET The subthreshold slope is a feature of a FET's current–voltage characteristic. In the subthreshold region the drain current behaviour – though being controlled by the gate terminal – is similar to the exponentially increasing current of a forward biased diode. Read more…
Computing
Agilent ADS Advanced Design System 2011.05 Math Functions For Measurement Expressions and diff() function padded 0 or 1
I was trying to plot the transconductance of a FET and the first 2 derivatives of it using Agilent ADS. Agilent has a diff() function that takes the nearest 2 points to compute the derivative of a data set. The problem is when it reaches the end it runs out of data.
Syntax: y = diff(data, pad)
pad = pad the differentiated data with an extra value [0, 1] integer 0 no
If pad is 1, then the differentiated data is padded with an extra value (last value of differentiated data) to make it the same length as the data to be differentiated. If 0 (default) then the length of the differentiated data is one less than the length of data to be differentiated
The problem is that the code has a bug in that it continues to differentiate till the last data point which means the first derivative's last value is always equal to 0 when padded. That means the second derivative's last value shoots up to a large value because between the first derivatives next to last point and last point there is a sudden discontinuity.
I thought I had found a solution to this by turning off padding. It indeed gets around the issue however if you need to do any OTHER math functions on your dataset then it appears you have to have full length derivative data. Otherwise it just refuses to plot the function. My comprimise was to turn off padding for the first derivative and leave it on for the rest. This gave me the "go to zero rapidly at the end of data" problem but at least it was contained enough in range to allow for good plots.
Research Links
Electronics
NSA Ant Catalog
Research Links
- Wikipedia: NSA Ant Catalog
- DailyTech: How the NSA can hack any American – includes a note how NSA intercepts Amazon packages and inserts their hardware
- Reverse engineering unlocks tech NSA is using to spy on Americans
Computing
Setting up VPN on UFSC Network and Accessing IEEE Papers
Most of this will be of no use to anyone except students at UFSC that want to set up a VPN and access IEEE papers.
Steps
- Log into your UFSC account and set up / enable VPN on you UFSC account. Look under the VPN tab under your Identidade
- Set up your VPN connection on your computer: UFSC VPN Instructions Here When I entered your credentials ( user / password ) I had to use my firstname.lastname ID and not my email ID. It did however use the password of this email account.
- If you get an error message when trying to log in saying the cliente does not support encryption: clear the Require data encryption (disconnect if none) check box, and click Allow unsecured password in Validate my identity as follows
​At this point I was able to log into the VPN.
Much later down the line I had to recover the VPN password because I was unsure which identity / PW was used for the VPN login. I used DialUpPass from Nirsoft to recover.
