RE: Conflicting recommendations for matching components

Simonr — Tue, 18 Jun 2019 07:37:52 GMT

I'd also like to add that the matching in the PCA10056 version is specifically tuned to the Dev kit antenna, and is not likely to fit just any other designs. As Jay says, please use the reference designs.

Best regards,

Simon

RE: Conflicting recommendations for matching components

Jay Tyzzer — Tue, 18 Jun 2019 00:24:59 GMT

Please use the reference design Schematics and Layouts.

https://www.nordicsemi.com/-/media/Software-and-other-downloads/Reference-Layouts/nRF52840-QIAA-Reference-Layout-1_1.zip?la=en&hash=AADE4CF18BAB55788294E9CE63A4339506D29F95

https://www.nordicsemi.com/-/media/Software-and-other-downloads/Reference-Layouts/nRF52840-CKAA-Reference-Layout-1_0.zip?la=en&hash=5F4891146419E62B74A05605DC805CF596FA8532

Also note that this matching network is to match the impedance of the ANT pin to 50 ohms. This network is different between the QFN and the WCSP part. Also, C22 should be included in layout but no component is mounted. An additional matching network is needed near the antenna. The type and number of components needed will depend on the type of Antenna used.