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

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aangles

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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
 

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