Jim Williams' Test Your Analog Design IQ #14
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- čas přidán 14. 07. 2024
- This week's analog IQ test leads us down the road of BJT temperature sensors, delta Vbe's, and diode theory! But how well does the theory hold up in the real world?
References / additional reading: www.analogzoo.com/?p=1052 - Věda a technologie
I know im 6 years late. But my god, these are so helpful and provide insight missing in analog design books. PLEEEASSSSEEEE MAKKKKKEEEEEE MOOOREEEEEEEEE!!!!!!
The single transistor Delta-Vbe trick is interesting, thanks for sharing!
Beautifully explained! You certainly have a gift for teaching!
+Jan Lategahn Thank you!
I love this video series. Very well explained. Looking forward to more. Thanks.
+Joe Laffey Thanks! More to come, stay tuned!
Absolutely great video! Thank you for all the effort.
One suggestion: please write the units of the quantities you write on the board/paper
Especially like the way you explain concepts. Makes it easy for this 60-something noob to
follow along.
+Chuck Yahrling Thanks, I try to explain them so that even *I* could understand it. ;)
Why does this channel have such low subscription number? Aaa because yt doesn't take into consideration quality but only quantity nowadays.
Man really appreciate your efforts here, great quality! Please keep it up. I know I'm late for your videos.
Very nicely explained and quality of your videos are really great.
Amazing! Very educational videos :) Thank you
Great vid as always, makes me wonder how they figured this stuff out way back when without all the resources we have. Thanks.
Good question. I think they were very smart, where as now we just look things up on the internet and copy.
They used their brains...
Excellent explanation
Thank you for the video...brilliant explanation..
Loved your explanation !😘 Upload more problems (subscribed😉)
Interesting! So they used the circuit with the instrumentation amplifier to eliminate the deviation of each transistor and just measure delta Vbe. Very clever!
Great video!
Man, blew away my college analog class
I love analog stuff. Nice vid.
Thanks! More please.
Maaan.... that Was awesome!!
"W2aew" (another utuber) make vids like this one.
You have got another subscriber, friend.
BLESSINGS...
Very good video. This morning I was looking into using 2-diode to220 device for a temperature control circuit. You just save a fair amount of research. 1e3 Thanks.
+Álvaro M. Valdebenito B. Glad it helped! There is a list of excellent references and additional reading in the associated blog post (see link in the video description) if you want more in-depth information on the subject.
Excellent really enjoyed
Hi there ! Great research about this schematic ! I wonder if the use of two transistors in current mode isn't also related to the TCR compensation of the resistors. When using only one transistor the collector current will also vary as the resistor heats up. Maybe using two of those preserves the currents ratios across temperature ?
Absolutely amazing to me that you understood so exactly what was going on with this circuit; I have to ask: where did you pick up this circuit knowledge (on a single small circuit, like this). I have a B.S.E.E. from the 80's, and nowhere in that formal education would I have picked up so much knowledge about a circuit like this.
really awsome :)
Analog IQ is my favorite!
did you use an HPLC column oven?
Very nice and simple mathematical explanation ! I wonder how Jim figured this out, as I'm sure he wasn't really into solving things numerically... great video.
+weed2luke Thanks! AFAIK, Jim Williams didn't come up with this, it's actually a well known "trick" used in band gap voltage reference circuits. IIRC, Bob Widlar pioneered a lot of this stuff, and Paul Brokaw's work is very well documented (he wrote a book and did a ~1 hour video on the subject, both very informative!).
Is that video by Paul Brokaw on youtube?
Vikas V I don't think so, but you can find it here: archive.org/details/APaulBro1989
Thanks for the link. Love your videos. They deserve more views.
how can i get pdf of this book?
Very good.
+Spongman S Thanks!
I was going to be a prick and bash the video. But then I saw math. Love you, keep up the good work.
Can share the multimeter link or part number?
Quite impressive!!
Recently I worked on DC to DC buck converter but while turing OFF negative spike is there.
It is causing problem for micro controller. If you interested to help me out I will share the design details and waveform also.
If Is is the common term and cancels out, why VBE or T does not cancel out on the same division?
Because the Vbe and T are exponents. You don't cancel exponents when dividing, you have to subtract them. That's where the Vbe1 - Vbe2 comes from.
Best ever
Thanks for the video, all good :)
I think you shall record your data and show them with the help of R language + ggplot2. You can even do linear regression based on your measurements.
If you like manipulate data and statistics, R if for you, ggplot2 just render them even better
cran.r-project.org/doc/manuals/r-release/R-intro.pdf is a good start point.
+np Yes, pretty graphs might be a bit easier to read. :)
I've never used R before, is there an advantage to using R+ggplot2 over a Python based solution (e.g., Python+pyqtgraph)?
+devttys0 That depend what you need, want to do, R is more likely Mathlab or Octave. Python + pyqtgraph should be enough if you want just for graph your dataset. In R it's pretty easy to use/plot without known so much about programming, R is data manipulation centric, python is more generalist programming language.
Can share the multimeter link or part number?
Quite impressive!!
Recently I worked on DC to DC buck converter but while turing OFF negative spike is there.
It is causing problem for micro controller. If you interested to help me out I will share the design details and waveform also.