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Posts: 2
Registered: ‎04-17-2017

Proper antenna load resistance Si4012

Hi,

 

document https://www.silabs.com/documents/public/data-sheets/Si4012.pdf, page 5:

 

>>Therefore the antenna load resistance in parallel with the Si4012 differential output resistance should equal 600 

 

document https://www.silabs.com/documents/public/application-notes/AN639.pdf, page 12:

 

>>For the Si4010 chip configured for the maximum value of PA bias current, the load resistance at which clipping occurs is RIN ≈ 500 Ω. As a result, this value is often stated as being the optimal load resistance for the Si4010 chip, and is usually the design target for the input impedance of a loop antenna.

 

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For the Si4012 chip, should I swap the 500 Ω with 600 Ω in Equation 26. ?