Digital Input output observing rise and fall time

[electronicsLearner77]

I am toggling a port but i observe a rise and fall time in digital output the micro used is ST and it is custom board. How do i rectify the issue? The switching is done at every 10KHz. Does it mean the PCB is not proper and has high capacitance?

 

[danadak]

What is the oscilloscope you are using, model number ?

You using 10X probe or 1X ? 10X preferred due to C loading of probe.

https://download.tek.com/document/02_ABCs-of-Probes-Primer.pdf

Difference between probe set for 1X versus 10X





Regards, Dana.

 

[electronicsLearner77]

Thank you for valuable information i will try with 10X, the oscilloscope is Keysight DSOX1204A.

 

[Bluejets]

I am toggling a port but i observe a rise and fall time in digital output

Switching in any circuit will have some rise and fall delay.

 

[Delta Prime]

How do i rectify the issue?

 

[Delta Prime]

Where do you suppose the fall time would be? If this is the leading edge of a sine wave
Then.....






Oopshttps://www.fluke.com/en-us/learn/blog/oscilloscopes/what-is-the-relationship-between-oscilloscope-bandwidth-and-waveform-rise-time#:~:text=Rise%20time%20is%20defined%20as,the%200.35%20rule%20of%20thumb.

 

[Delta Prime]

. Does it mean the PCB is not proper and has high capacitance?

No! Calibrate your Scope probe.

 

[danadak]

https://www.analog.com/media/en/training-seminars/seminar-materials/time_domain.pdf

https://pearl-hifi.com/06_Lit_Archive/02_PEARL_Arch/Vol_16/Sec_53/Tek_Circuit_Concepts/Probe_Circuits_11_69.pdf

The above might help.


Regards, Dana.

 

[Delta Prime]

https://www.analog.com/media/en/training-seminars/seminar-materials/time_domain.pdf

https://pearl-hifi.com/06_Lit_Archive/02_PEARL_Arch/Vol_16/Sec_53/Tek_Circuit_Concepts/Probe_Circuits_11_69.pdf

The above might help.


Regards, Dana.

I just answered his questions now he's going to have to read!