how to improve phase noise of Atmel ATRF212 transceiver to meet ETSI EN 300 220

Hello,

is there any way to reduce the phase noise of the atmel atrf212 chip such that we can transmit up to 14 dBm in the band 868-868.6 MHz with an RF front end CC1190. For example CC1101-CC1190 can meet modulation bandwidth requirements and transmitting up to 18 dBm, see page 17, figure 4.18 and page 19, number 7: CC1101 Register Settings: AN094 -- Using the CC1190 Front End with CC1101 under EN 300 220.
In particulary it says:

"Improving the CC1101 phase noise reduces the modulation bandwidth for a given output power and allows operation up to +18 dBm output power."--Z

It should be a way to to the same with Atmel ATRF212 transceiver.

Thank you very much

Yours faithfully

I don't know how familiar you are with RF themes, maybe I am suggesting you something you are already doing or that sounds obvious to you.
A few things to check:
- improve quality of your power supply. Be especially careful of switching converters near the transceiver
- if the transceiver has multiple power lines (e.g. digital VCC and RF VCC) decouple each one of them with an L-C network (ferrite bead and capacitor)
- separate RF and digital grounds and join them at only one point by using a 0 Ohm resistor
- improve oscillator stability
- a good PCB design is essential. You can find on the internet several guidelines for this