nRF52832 CIAA ANT pin Matching Network with Thin Board

[bdub94]

Hello, per the product specification, I see that the nRF52832 CIAA variant requires a shunt 1.0pF capacitor and series 3.3nH inductor.

Is this recommended regardless of the board thickness? I will be using a 0.2mm thick board.

[Sigurd Hellesvik]

Hi,

Hello, per the product specification, I see that the nRF52832 CIAA variant requires a shunt 1.0pF capacitor and series 3.3nH inductor.

Is this recommended regardless of the board thickness? I will be using a 0.2mm thick board.

I recommend that you use these values at first, but measure the impedance on a test board and then change the components to tune it.
You will want to tune the matching network on the antenna side as well.

In other words, you use those values as a starting point.

We can also provide help with tuning.

Regards,
Sigurd Hellesvik

[bdub94]

For ANT pin matching network, would you be able to share VNA / spectrum analyzer test results for the nRF52832 CIAA?

I've seen the results for the nRF52833 and nRF52840 from the post linked below, but haven't been able to find such for the nRF52832.

 RE: nRF52840 matching network for pin 31(ANT), matching circuit needed for regulatory requirements, EMC 

Also, do the components need to be tuned at a specific output power level?

[ketiljo]

Here's the nRF52832 CIAA matching network: nRF52832 CIAA matching network.pdf

If you copy the reference design, it shouldn't be necessary to tune anyting. 

[bdub94]

Thanks for providing this!

I see that the document has test results for the matching network itself, but not for the impedance when the nRF52832 is in place and on/off (which was provided in the post I linked for the other chips).

Would you be able to provide these testing results as well?

[ketiljo]

For this device, only the matching network has been measured. 

[bdub94]

Got it. Thanks!