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7 votes
Accepted

Why have some wide trace at the begninning, but smaller trace at the end?

It looks like the traces are thinned in that area so more of them can fit in the available space. This is a common issue when routing high-density boards. You start the layout with the default trace ...
AnalogKid's user avatar
  • 20.9k
6 votes

Which is preferred over differential pairs: trombones or sawtooths?

In your first three examples, the differential pairs do not appear to be particularly tightly coupled. The trace separation is at least 4x the trace width. This means that the impedance discontinuity ...
The Photon's user avatar
  • 131k
5 votes

Why have some wide trace at the begninning, but smaller trace at the end?

There might be several reasons. The first one is that there may be no reason specifically, it might be an error or just how it happened to turn out. The second reason might be that the BGA is very ...
Justme's user avatar
  • 155k
4 votes

Which is preferred over differential pairs: trombones or sawtooths?

Which one is better depends on the application and. They are both sort of bad anyway. If you want to maximize the total signal integrity for best performance (for whatever metric that is), you don't ...
Justme's user avatar
  • 155k
4 votes

Resistance Vs Reactance Definition

As I understand from all what I read the resistance is responsible for the current flow and the reactance is responsible for the rate of change of current (phase shift). Am I right for what I write or ...
Puk's user avatar
  • 643
4 votes

Resistance Vs Reactance Definition

Both resistance and reactance are forms of impedance, in that they impede the flow of current. However, a major difference between resistance and reactance relates to power and energy. (Power is the ...
Math Keeps Me Busy's user avatar
3 votes

Is it possible to simulate reflections by designing an RLC transfer function?

You are trying to model a transmission line as a lumped model when it's more complicated than that. The way you have to do it is you have to break your lumped model model up into discrete RLC "...
MOSFET's user avatar
  • 4,697
2 votes

Is it possible to simulate reflections by designing an RLC transfer function?

Is it possible to simulate reflections by designing an RLC transfer function? It's possible if you are content with the simplistic results obtained from a single LC low-pass filter. However, it's ...
Andy aka's user avatar
  • 462k
1 vote
Accepted

RC series analysis with H parameters model

Given \$\left[\begin{matrix}v_1\\i_2\end{matrix}\vphantom{\begin{matrix}R\\sC\end{matrix}}\right]=\left[\begin{matrix}h_{11}&h_{12}\\h_{21}&h_{22}\end{matrix}\right]\left[\begin{matrix}i_1\\...
periblepsis's user avatar
  • 10.3k
1 vote

Why are capacitors high-pass / low pass frequency elements?

I'll try to explain it without relying on any AC concepts. For high-pass, imagine changing the voltage on the left side of the cap very slowly. The resistor will keep draining the right side to ...
Luke M's user avatar
  • 111
1 vote

Difference between characteristic impedance vs complex impedance

The characteristic impedance is the theoretical impedance you'd measure at the end of an infinitely long line. The impedance you measure with a VNA for a finite line includes the effect of reflection ...
John Doty's user avatar
  • 4,582
1 vote

Impedance of different track widths - Should I compute the average width?

The calculator needs the width as it affects the impedance. Therefore you should not change the width of the track mid-way if you want the impedance to be continuous. Any discontinuity will cause ...
Ralph's user avatar
  • 3,464

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