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Author Topic: DC blocking caps selection for a Filter(Band pass).  (Read 1092 times)

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Offline madhu.wesly01Topic starter

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DC blocking caps selection for a Filter(Band pass).
« on: March 26, 2019, 02:09:35 pm »
Hi,

I am going to use the below Filter in my RF application. One thing I could not understand is: finding out the DC blocking capacitors' values which are recommended as a part of supporting circuit. Please, let me know if I should use the DC blocking caps, if yes, what should be the capacitors values??

https://www.johansontechnology.com/datasheets/0868LP15A020/0868LP15A020.pdf


TIA!

Best regards,
Wesly.
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Offline chrisl

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Re: DC blocking caps selection for a Filter(Band pass).
« Reply #1 on: March 26, 2019, 05:50:04 pm »
The IN/OUT ports of the filter are DC short to the GND.
If your circuit does not have any DC component on those ports you do not need the DC block caps.
Otherwise 100 pf ~ 200 pf range of caps will do.
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