Comment by periblepsis on Why does my LC tank not change the frequency...
So you have a perfect \$C=20\:\text{pF}\$ and \$L=125\:\text{nH}\$ for your tank? How much analysis of your board parasitics have you done? Also, if you are measuring a much higher frequency, then your...
View ArticleComment by periblepsis on What is the limit value for the gain of a...
Gain and time and S/N are part of the question. I've made precision measurements at under 10 fA. But noise was above 600 aA and measurement period was 10 samples per second.
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Answer by periblepsis for Help: Thevenin's and Norton's theorem
for this particular example where (by my professors' technique) youshort circuit the voltage source and make a break in the circuit wherethe current source is after which you calculate impedance of...
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Answer by periblepsis for Node voltages with dependent current source
You've not responded for days now, so I'm not expecting a response. But I'll see about helping others reading your writing.First off, \$R_2\$ has a finite impednace while an ideal current source,...
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Answer by periblepsis for NPN transistor base doesn't drain as much current...
Ignoring odd arrangements, there are two cases that have very different results with BJTs: (1) operated as an amplifier (active mode); and, (2) operated as a switch (saturated mode).Technically, these...
View ArticleAnswer by periblepsis for How can I convert a 7 bit 2s complement number into...
If you know that this is a full word of 7-bit, that it is twos-complement (that it is not an 8-bit twos-complement value where you've taken only the least significant 7 bits), then you know it is...
View ArticleComment by periblepsis on Inexpensive microcontrollers capable of reading...
ADSP21xx, if they are still available. Used to be $5 each for an ADSP2105, though I preferred the 2111, instead. The ADSP21xx I used (not the fastest) had an 80 ns cycle time and could read from two...
View ArticleComment by periblepsis on Pull up resistor question
Codefast, I'm not intending on writing a response at this time but it is wonderful to see you asking questions like this. There are nuances and some very useful new ways to think in your question for a...
View ArticleComment by periblepsis on How to I add tolerance to an LTspice .lib...
@tobalt It I follow you, then LTspice has an idiosyncrasy. If you use numbers for the model names (1, 2, 3, ...) and then a STEP can be used to walk through any number of random models. It may be...
View ArticleComment by periblepsis on Output Circuit after LDO
@Tom, I've seen these used before when there are high frequency issues and multiple DC supply rails (usually beads are used, but inductors in the range of value I see here can also be used.) Read...
View ArticleComment by periblepsis on Can an amplifier's slew rate vary based on input...
I provide a plot from Pressman's book here that illustrates the linearity of the diff pair when small difference signals are provided. But it also illustrates how that changes with larger signals. Just...
View ArticleComment by periblepsis on Why does the Voyager space craft use a 3.7 meter...
Ofosot, I see that we still haven't so much as heard more than a peep from you since asking the question. If you are still around, let us know. I've contacted JPL, by phone, today and left a contact...
View ArticleComment by periblepsis on What exactly makes the SET_ADDRESS command fail in...
The official development board works, if I understand what you wrote. Your own fabricated boards don't work. (Not sure about that, though, since you also appear to write: "my device [is] able to...
View ArticleComment by periblepsis on Three Ammeter Method, Which formula is correct?
Aaryan, If I may: "A memorized formula solves just one problem. Learned theory solves a lifetime of problems."(Permission given to quote me, freely.) One of the branches dissipates only real power. The...
View ArticleComment by periblepsis on If the inverting and non inverting terminal of an...
Keshav, R3 is negative feedback. It allows the output to alter what is seen at Va. The opamp, having a very high "multiplier" times Vd (as you write it), very quickly alters its output so that the...
View ArticleComment by periblepsis on How does EMF strength decrease with distance from a...
A reference may be "Human Interaction with Electromagnetic Fields: Computational Models in Dosimetry" by Dragan Poljak & Mario Cvetković. In particular, see section 3.1.2 Fields Generated by...
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Answer by periblepsis for Stuck on Thevenin Equivalence Problem
addressing your questionFrom what I've been able to find, \$V_{_\text{TH}}=I\cdot R_2\$, \$R_{_\text{TH}}=R_1\$Your \$I\$ and \$R_2\$ is already a Norton source. The Norton source can be converted to...
View ArticleComment by periblepsis on Computing the voltage variation of a node in a...
Is that 10 resistors total and just 2 current sinks? Or is there something more general I'm missing? I don't see a problem in the first case.
View ArticleComment by periblepsis on What's wrong with my equations?
Direct answer pinpointing the error.
View ArticleComment by periblepsis on Computing the voltage variation of a node in a...
@LeonhardEuler That's a sensitivity equation. I write elsewhere here about those, as well. That can be directly derived from the solution.
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