mowgli
Full Member level 2
Hello all,
this morning I was having a coffee break with a collegue and we were talking about problems faced during our own working experiences, when he told me something that at the moment made me curious: the topic was too high spurious emission of a HF transmitter and he told me that the RF engineer of the customer company said that, in his opinion, the problem was generated by capacitors used in the matching network in the RF path between power amplifier output and antenna input. In particular the engineer said that some capacitors are built in a way that at certain frequencies exhibit parasitic components which behave like diodes, introducing strong non linearity due to clipping (or what else) which is the source of the spurious harmonics observed at the output of the matching network (the output of the PA itself was pretty good: only in conjunction with the matching network spurious are presents). I am not experienced on RF design (I am a SW developer with only a university background on RF subjects) but this talk raised my curiosity: does anybody have some suggestions about this?
Thank you
Mowgli
this morning I was having a coffee break with a collegue and we were talking about problems faced during our own working experiences, when he told me something that at the moment made me curious: the topic was too high spurious emission of a HF transmitter and he told me that the RF engineer of the customer company said that, in his opinion, the problem was generated by capacitors used in the matching network in the RF path between power amplifier output and antenna input. In particular the engineer said that some capacitors are built in a way that at certain frequencies exhibit parasitic components which behave like diodes, introducing strong non linearity due to clipping (or what else) which is the source of the spurious harmonics observed at the output of the matching network (the output of the PA itself was pretty good: only in conjunction with the matching network spurious are presents). I am not experienced on RF design (I am a SW developer with only a university background on RF subjects) but this talk raised my curiosity: does anybody have some suggestions about this?
Thank you
Mowgli