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Hi
I have a 3 stage gain circuit each with gain of 10. I use Ti THS2301 that has about 320MHz BW at gain of 10. The circuit split into two pcb connected together by short coax.
1) First pcb has two stages driving the coax to the second pcb. input is a 50ohm coax
2) Second pcb has one stage...
Thanks FvM, I found it. I did not see it first.
Do you know of another one. I want to run two to verify each other. I had two different calculator that gave me different answers, it's over 20% difference.
I went on web to find impedance calculator for asymmetric stripline. Basically I got two different answers.
I have asy stackup of H1=8mil, H2=25mil, all 1oz copper(1.4mil). I set width of trace of 8 mil with er=3.55. At least two calculators gave 67ohm, two gave 56ohm. What is the story?
Below...
Ha ha, my computer don't have F2!!! I tried pushing the top roll key after your suggestion yesterday, it did not work!!!
Bottom line, I want to learn the syntax of the opamp subcircuit. I read the file Maxim sent me, it's not as simple as the netlist file of .asc. I am searching the yahoo group...
I still have no luck. I open a new file in LTSpice, use op to type .include LT1026.sub, then I go to files/LTC.../lib/sub and clicked LT1026.sub. It said it cannot open binary files.
I tried dragging the LT1024.sub into the schematic, it said the same thing.
I tried changing the .sub to .txt...
Thanks
I join and posted my question. Now I cannot even find my own post!! That forum is so different.
But anyway, I spent this afternoon reading the netlist file of my schematic to familiarize with the file, I think I know enough to write in netlist file ( stumbling though). Do you know how...
Thanks, I am still very new with LTSpice. All I know is to .include MAX44263, then using opamp2 and change the name to MAX44263. Can you give me some guidance what to do in this case?
Thanks
Alan
I am using LTSpice for simulation. I downloaded the model for dual opamp MAX44263 from Maxim. That's the only model of that opamp. I tried to include into the simulation program but it will not accept it.
I need to understand the terms in the .txt file so I can get rid of the second opamp and...
I have two questions:
(1)As the tittle, if \[u(a,\theta,t)=0\], is
\[\frac{\partial{u}}{\partial {t}}=\frac{\partial^2{u}}{\partial {r}^2}+\frac{1}{r}\frac{\partial{u}}{\partial {r}}+\frac{1}{r^2}\frac{\partial^2{u}}{\partial {\theta}^2}\]
and
\[\frac{\partial^2{u}}{\partial...
This is a question in the book to solve Heat Problem
\[\frac{\partial \;u}{\partial\; t}=\frac{\partial^2 u}{\partial\; r^2}+\frac{1}{r}\frac{\partial\; u}{\partial\;r}+\frac{1}{r^2}\frac{\partial^2 u}{\partial \theta^2}\]
With 0<r<1, \[0<\theta<2\pi\], t>0. And...
I already find proof that for \[0\leq \; r\leq \;a \] where \[R(0)\] is finite and \[R(a)=0\]:
\[\int_{0}^{a}\int_{0}^{2\pi}\int_{0}^{\pi} j_{n} (\lambda_{(n,j)}r) j_{n'} (\lambda_{n',j'}r) Y_{n,m}(\theta,\phi)\overline{Y}_{n',m'}(\theta,\phi) \sin\theta \;dr d\theta d\phi = \int_{0}^{a}...
Helmholtz equation stated that
\[\nabla^2 u(r,\theta,\phi) =-ku(r,\theta,\phi) = f(r,\theta,\phi) \]
This is being used for Poisson equation with zero boundary:
\[\nabla^2 u(r,\theta,\phi) = f(r,\theta,\phi) \]
and
\[u(a,\theta,\phi)=0\]
I just don't see how this can work as \[k=m^2\] is a...
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