I have a question about layout of the saw duplexer. I am using epcos saw duplexer for cellular (PCS for example) and I don't know how to make a layout for it.
Do anybody have any experience in this I will appreciate...
The layout seems to be fine but add some vias under the case to connect ground of the SAW filter.Add at least 6-8 small vias under the package..( if you're using double or multiple layer PCB)
In addition to, increase just a little bit the copper pour pattern around input and output pads to prevent the parallel capacitors which aren't wanted..
If your frequency is NOT too high, it's not neccesary to separate the ground to obtain a independent ground pattern. But it's an idea to seperate the "grounds". But if you ground connections are not very established, you'll some small indcutances on common mode way and obviously some RF signals may disturb in common mode..