Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [signal-integrity]

Questions regarding how to properly ensure Signal Integrity, protection from noise, shielding, proper pcb layout.

Questions regarding how to properly ensure Signal Integrity, protection from noise, shielding, proper pcb layout.

477 questions
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What to do with excess co-ax cable

These days light aircraft come with lots of instruments that require thin co-ax cable for GPS antennas, transponders, collision avoidance systems, tracking and navigation systems.Like this GPS antenna as an example. Whats the best way (from the…
ConanTheGerbil
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Trace crossing splitted power plane

Most sources on the internet discuss routing signals over a split power plane and how to do this properly. The main solution here is to create a short return current path. I'm wondering whether routing signals over a split power supply plane (not…
Bianco Zandbergen
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6
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Why does the capacitance on a line disappear when properly terminated?

Came across an Adafruit interview with the one and only Paul Horowitz and he said something interesting. Part of interview thats related to this question He said in more or less words that the capacitance of a line disappears when the cable is…
efox29
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Signal integrity

I am working on signal integrity of the PCBs. I have some misunderstanding in handling high frequency signals. Resistance and inductance increases with high frequency signals, so we have to take care while routing high speed signals. But while I am…
M.Arun kumar
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1 answer

Simulation of pulse through transmission line with IC load with ringing

There is a pulse going through a transmission line. There is a phenomena where if we put a pulse through a transmission line then after it reaches the IC we can have ringing instead of good pulse. In LTSPICE simulation connector is represented as…
Josh23
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1 answer

Is PWR plane acceptable as return path for high speed signals instead of GND?

For high speed signals where ωL>>R for the transmission line, the return current becomes concentrated close to the wave guide which is the PCB track. The return path for this current shall be in the GND. My question is, what is the significance of…
quantum231
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2 answers

Is it possible to physically measure the input and output impedance of a component?

Input and output impedance is an important property of complex electronic components. Is it possible to physically measure them like we measure resistance? Is it possible to measure it for BJT based transistor amplifiers and FET based transistor…
quantum231
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transmission loss with microsd extender

Would a 20-30cm microSD extension cord suffer any kind of noticeable transmission loss? This is a passive extender - literally, a microsd card with wires coming off of it, and a card slot at the other end. Simple ribbon cable connecting the two…
kolosy
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1 answer

Twisting three signal wires which are carrying a differential signal

I have a driver module came with its differential input signal wires as shown below(red, black, green): I provide the signal from DAC with diffential outputs. My question is, since its not twisted shielded cable and the wire is made up of sig+,…
GNZ
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Sensor question for low freq

A floating DC voltage output sensor will be powered locally and the signal will be sent outdoors 200 meters far away to a data acquisition board. I didn't receive the sensor yet and don't have the datasheet. But my question will be about something…
GNZ
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Output impedance imbalance and CM noise in truly floating sources

In the following Figure 1 and Figure 2, the sensor is the one in dashed box. The output impedance of the sensor is big and in this case is 1k Ohm. And as you see regardless of the sensors are bipolar or single-ended output, the sensor ground is…
user1245
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Comparison of two configurations to balance source impedance

This is a generic question for about frequency sensors. But as an example I use this sensor which has around 1k output impedance. So in below drawing the source in dashed box has 1k output impedance: simulate this circuit – Schematic created using…
user1245
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Where do all the PDN capacitors sit?

I have my voltage rails coming off board and I have quite a number of ICs. Each has their own decoupling and for the really demanding ICs I have a bulk capacitor. If I have some target impedance and it's said that to achieve that impedance I need 10…
efox29
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0
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How do I match the Red Pitaya's signal strength with that of a function generator?

I'm trying to send a signal from a Red Pitaya's fast analog output through a very long RG174 cable. The signal comes out quite noisy and somewhat attenuated on the other side (purple is the signal at the Red Pitaya output, yellow is the other side…
Zurn
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Are digital inputs of data acquisition devices differential or single ended?

I read that in almost all daq board datasheets the analog inputs are specified as single ended or differential inputs. But the same daq have digital I/O ports. How can one understand whether the digital input is differential ended or single-ended.…
GNZ
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