¿ªÔÆÌåÓý

ctrl + shift + ? for shortcuts
© 2025 Groups.io
  1. Qrp-Tech
  2. Messages
Single Messages Topics Expanded

Re: SMD Caps in a Crystal filter

 

Against that, they have less stray inductance because of the lack of
component leads. Back in the days when SMD parts were shiny and new,
their first widespread use was in UHF and microwave circuits for that
reason. At the time they cost more than through-hole parts and robotic
assembly was not yet a thing, so they were chosen solely for
performance.

On Fri, Aug 16, 2019 at 5:53 PM Joel Caulkins/N6ALT <caulktel@...> wrote:

Thanks Mike,

I have used them for LPF and BPF designs with no problems but wasn't sure about using them in Crystal filters. I also am using size 1206 caps and think I will give it a try and then sweep it to see if it has any effect on the calculated filter. I have read about ground capacitance when using SMD caps with them being so close to the ground plane but haven't really seen any real problems at HF frequencies.

Joel
N6ALT
Join [email protected] to automatically receive all group messages.