mchpddl1
Newbie level 6
cost difference fr4 and nelco 4000-13
Hi,
Can i ask you experts here, if i am designing a high pass filter using 0402 chip LC components; and i need a 4 layers PCB. Because my circuit consists some microstrip lines, i used the second layer as ground plane, with substrate height being 200um, thus forming microstrip on top layer and ground on second layer. The other layers 3, 4 are left unused.
From you experience how much clearance does the ground plane need to be away from the lumped components located on top layer? Will ground plane cause problems when it is 200um away from the components?
My measurement results show the filter shape has shifted by down by 100MHz lower than desired (ie 800MHz instead 900MHz). Can you suggest why it shifts to lower frequency, any possible causes?
Many thanks
Hi,
Can i ask you experts here, if i am designing a high pass filter using 0402 chip LC components; and i need a 4 layers PCB. Because my circuit consists some microstrip lines, i used the second layer as ground plane, with substrate height being 200um, thus forming microstrip on top layer and ground on second layer. The other layers 3, 4 are left unused.
From you experience how much clearance does the ground plane need to be away from the lumped components located on top layer? Will ground plane cause problems when it is 200um away from the components?
My measurement results show the filter shape has shifted by down by 100MHz lower than desired (ie 800MHz instead 900MHz). Can you suggest why it shifts to lower frequency, any possible causes?
Many thanks