Wilson_yu_chen
Advanced Member level 4
Hi professionals,
Recently I met a problem of wide band noise in receive band which is over specifications. I jumped the EVB RF signal wired to my module board, then the problems's gone. Thus I would suspect that it's more like a digital interference
to RF circuit. The spectral spurs are frequency (15MHz/10MHz) offset to desired frequency channel and failed all channelsfor TX noise in receive band.
But before the root casue comes out, I shunt a small resistor around 18ohm to the PA input pin, then wideband noise level comes down. So, what happens to PA for that magic resistor ? The only hting I can think is that low value resistor would lower the PA input power which means degarde a little of PAE, but noclue to me.
Pls kindly comments, Professionals
With Regards,
Recently I met a problem of wide band noise in receive band which is over specifications. I jumped the EVB RF signal wired to my module board, then the problems's gone. Thus I would suspect that it's more like a digital interference
to RF circuit. The spectral spurs are frequency (15MHz/10MHz) offset to desired frequency channel and failed all channelsfor TX noise in receive band.
But before the root casue comes out, I shunt a small resistor around 18ohm to the PA input pin, then wideband noise level comes down. So, what happens to PA for that magic resistor ? The only hting I can think is that low value resistor would lower the PA input power which means degarde a little of PAE, but noclue to me.
Pls kindly comments, Professionals
With Regards,
