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CC2640R2F: CC2640R2F antenna consultation

Part Number: CC2640R2F
Other Parts Discussed in Thread: CC2640

Tool/software:

Hello,

The customer is using CC2640R2FRSMT and has the following two questions. Please help answer them.

Question 1: What are the main functions of the π - shaped network shown in the figure below? What is the function of a 12pF capacitor?

Question 2: As shown in the following figure, how to configure the parameters of "Cap array Trning" in the official CC2640 DTM program? Is there a corresponding table between the values of this array and the specific capacitance values?

Thanks!