Questions tagged [characteristic-impedance]
Characteristic impedance is the ratio of the amplitudes of voltage and current of a single wave propagating along a transmission line (i.e. without reflections traveling in the other direction). Its SI unit is the ohm.
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PCB trace impedance infinite equivalent impedance of RLC model
I am trying to understand the PCB trace impedance model. Although not exactly, if we take a very small section of a PCB trace as an example, let's assume that it is in the form of series R, series L ...
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How to match multiple impedance discontinuities?
I am trying to design a circuit to transmit various digital high frequency signals over cables, connectors and pcb to an oscilloscope. The simplified circuit looks like this:
simulate this circuit &...
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coplanar waveguide impedance calculation and tolerance
The Ublox Sara R5 System Integration Guide I am following states that a 50 Ohm antenna waveguide design is recommended and provides a couple example designs that achieve this using FR4 dielectric.
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PCB interconnect trace characteristic impedance (Z0) at low frequencies
In high frequency signals, we generally set the trace characteristic impedance between 50-120 Ω. Calculation tools, for example, use the impedance calculation tool designed by Altium Simbeor, and it ...
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PCB trace impedances of integrated circuits with high input impedance
There is an ADC front end IC (opamp) at the input of my ADC card and it has high input impedance,
What should I set the differential trace impedance to when drawing the PCB? Does this matter much?
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CAN Protocol traced routed with 90 ohm characteristic impedance
I am using ISO1042BDWV in my board. The schematic is given below. I know that the characteristic impedance of the CAN bus is 120 ohm.
The layout team routed CANH and CANL as 90 Ω differential. The CAN ...
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Characteristic impedance of a BNC jack to jack adapter
I have this BNC jack to jack adapter. I want to measure its impedance but I am reading around 1mΩ. The datasheet says that it is a 50Ω adapter.
Why am I measuring such a low resistance?
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Coax cables, impedance matching and BNC extensions
I'm trying to understand how to do proper measurements with a Voltage Differential Probe ( TT-SI 9010. This probe has an output impedance of 50ohm and has a BNC (It doesn't specify it in the data ...
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Balun converting 100ohm single-ended trace to 50ohm single ended for spectrum analyzer
On my board, I have 100ohm differential pair traces connected to a 1:1 balun, so the signal impedance becomes 100ohm single ended. I would like to measure the signal spectrum with spectrum analyzer. ...
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Confusion About Impedance Matching For Single-Ended and Differential Lines
I understand that for single ended RF signals I must ensure that the characteristic impedance of the transmission line matches the load impedance (say 50 ohm). I am a bit confused for differential RF ...
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Does coiling a transmission line affect its characteristic impedance?
If I take an advertised 50 ohm impedance cable and turn it into a coil will this change its characteristic impedance from 50 ohm to something else? My intuition tells me it should as if we look at one ...
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From the perspective of a progressive wave, what is lumped impedance? [closed]
This question asks about the meaning of lumped impedance in traveling wave theory.
Should lumped impedance be viewed as something like a point charge, a point mass, or a direct delta function?
When a ...
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Connector impedance matching
The importance of termination matching the cable is emphasized all the time. But before the wires reach the termination resistor they usually pass the connector. I've only seen the impedance specified ...
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How to do impedance matching when when all 3 characteristic impedances differ? [closed]
If we have a circuit like this and we need to do impedance matching on smith chart. How would we go about doing it? I think you would have to first normalize with the Zo1 and go to the 1+jX circle and ...
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Derivation of input admittance of a lossless T-Junction Power Divider that is matched at the input port
I'm trying to understand how the equation for the input admittance for a lossless T-Junction power divider was derived, which is only matched at the input.
Let \$Z_0\$, \$Z_1\$, \$Z_2\$ be the ...
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