11
votes
Accepted
How is the impedance of SMA (or RF) connectors measured and rated?
This return loss plot doesn't say anything about impedance.
This is incorrect.
The return loss is measured relative to a particular characteristic impedance. The return loss of the connector will ...
- 134k
5
votes
Accepted
If I am forced to change the impedance of transmission line, how to continue?
The type-A plug-socket pair introduces a fairly big discontinuity. Whatever you're doing with those little traces won't matter much. Sure you'll get quantitative answers with a TDR - but they are not ...
5
votes
How is the impedance of SMA (or RF) connectors measured and rated?
As with everything, there are multiple ways of viewing data of a system, some more useful or used more often than others.
You expect a Smith chart which has the complex impedance plotted on it based ...
- 172k
3
votes
How does this LRC network meet rise time requirements?
The cap+36 ohm resistor is an AC termination for the bus. Simplistically, it provides 36 ohm termination for high frequency components of the signal (like the edges) while not loading the bus in a DC ...
- 11.1k
3
votes
How is the impedance of SMA (or RF) connectors measured and rated?
You easily turn the 35 dB return loss into an impedance variation from 50 ohms. Many vendors provide a return loss graph for their products. Here's a typical return loss spec from a Pasternack ...
- 11.1k
3
votes
Can I trust Altium Designer Impedance Calculator over my PCB Fab?
In my experience, no two or more different fabricators will give he same geometries for a given controlled impedance.
They may have the same overall envelope (track + gap + track) for a differential ...
- 22.6k
3
votes
How is the impedance of SMA (or RF) connectors measured and rated?
Return Loss (RL) is gauged against a 50-ohm circuit impedance. One can first convert RL to a voltage standing wave ratio (VSWR) to determine the impedance from RL. For instance, an RL of 14 dB ...
- 1,156
2
votes
What value should I use for the Impedance trace to copper?
The trace-to-copper distance isn't critical here. If you reduce it, then the required trace width will be slightly reduced. Which is probably not desirable because narrower traces are harder to keep ...
- 134k
2
votes
How does this LRC network meet rise time requirements?
Simple RLC circuits such as this are easily simulated. In fact, we have such a tool available at our fingertips (a button in the edit window), a schematic entry tool courtesy of CircuitLab:
simulate ...
- 45.6k
1
vote
How does a voltage divider work?
Explaining by reinventing
How does a voltage divider work?
To explain a circuit (in this case, a voltage divider), it is necessary to show the role of each element (resistors R1 and R2). This can ...
- 19.4k
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