nrf51422 DTM RX

[jiaozewu]

When nrf51422 passed the authentication, when entering the rx mode of DTM, there was always a -59dbm launch at the 2.79GHz frequency point, what caused it, and how to eliminate the launch?

[Andreas]

Hi,

 

This is the LO leaking out and if the reference layout has been poorly replicated it can reach these levels. It can be reduced by tuning the matching network, though a larger layout difference most will often require more tuning, and often require sacrifice of some output power to reduce the spurious. We therefore recommend replicating the reference layout as closely as possible.

 

Best regards,

Andreas