RE: nRF52805 PCB layout example

ketiljo — Wed, 05 Aug 2020 14:14:14 GMT

[quote user=""]1 - I don't understand why on the PCB layout example the track that is connected the L2 inductor is 762µm thick while the thickness of the pcb is 0.8mm?[/quote]

The impedance at this point isn't 50 ohm. More important to keep it short than to control the impedance.

[quote user=""]2 - To have an impedance of 50 ohms with this track width, isn't it necessary to have a PCB with a lower thickness (0.4mm)?[/quote]

See #1

[quote user=""]3 - What are the functions of components L1, L2 and C3? Is it just a low-pass filter?[/quote]

Impedance transformation to 50 ohm and low pass filtering

[quote user=""]4 - Can the L1, L2 and C3 components be replaced by this reference 2450FM07A0035 from Johanson technology?[/quote]

No, this is designed for a another device with different impedance .