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CC1101 TX Current VS. Output Power: How are they related?

Other Parts Discussed in Thread: CC1101

Hi!


I am interested in the relation between PATABLE settings of the CC1101 and the resulting TX current. I have taken a closer look on the Design Note DN013 (http://www.ti.com/lit/an/swra151a/swra151a.pdf) and plotted the output power at 868MHz  against the TX current. This is the result:

(Link to bigger version at imgur.com: http://i.imgur.com/sIejFU3.png)

I would be especially interested in an explaination for the offset at around -2dBm and the noise from -8 to -2 dBm.

Thank you very much!

Sebastian