nRF9160 ANT output: DC blocking capacitor needed?

[lobaro-theo]

Hello,

in our design we use a RF switch behind the ANT LTE antenna I/O of the nRF9160. Many RF switches need DC blocking capacitors in series with the RF signal due to their internal contruction. 

An example of such implementation is:

Question:

Is C2 needed? E.g. is there the chance of DC on the ANT pin or is a capacitor already inline inside the nRF9160. If the nRF9160 inlcudes some inline C we could remove the C2 in our design. Thanks for a insight into the internal ANT design of the nRF9160.

Best regards,

T.Rohde

[Andreas]

Hi,

 

The ANT pin is DC short to ground, you only need a DC block if there is any DC offset on the pin of what you connect it to.

 

Best regards,
Andreas