DC blocking caps selection for a Filter(Band pass).

• DC blocking caps selection for a Filter(Band pass).
  Posted by madhu.wesly01 on 26 Mar, 2019 14:09
• 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.
• #1 Reply
  Posted by chrisl on 26 Mar, 2019 17:50
• 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.