I found this in a schematic on the web. I don't understand the use of this capacitor.
Capacitor:
Partial circuit diagram:
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\$\begingroup\$ Show the rest of the circuit. Where do the arrows go? \$\endgroup\$– JRECommented Nov 30, 2022 at 14:59
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\$\begingroup\$ Did you ask a very similar question a few days ago? \$\endgroup\$– Andy akaCommented Nov 30, 2022 at 15:01
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\$\begingroup\$ i added the link to the schematic \$\endgroup\$– R_HjrCommented Nov 30, 2022 at 15:01
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\$\begingroup\$ @Andyaka no , i did not ask this question before \$\endgroup\$– R_HjrCommented Nov 30, 2022 at 15:03
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\$\begingroup\$ What a mess of a schematic. It obscures as much as it explains. \$\endgroup\$– JRECommented Nov 30, 2022 at 15:10
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1 Answer
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The answer may be in the layout of the PCB. It is possible that some high frequency return current(s) need a path back to their source but the reference plane is split between 3V3 and 24V0.
The capacitor would "stitch" 3V3 and 24V0 at high frequencies to allow for the current(s) to return back. The downside is that now high frequency noise can also couple between the voltage rails.
https://www.protoexpress.com/blog/best-high-speed-pcb-routing-practices/
