Any Mobile Phone Impedance

[Ghild]

Hi Robert,

I recently designing PCB connected to mobile phone jack for recording audio. yes, Impedance matching is at circuit side, but I want to know there is something I need to consider at layout side ?

I am using 2 layers PCB and stack-up follow manufacturer standard.

Thank you,

[robertferanec]

I am not an analogue expert, but if you are using 2 layer stack-up follow manufacturer PCB it may not be easy to match impedance. Also, if I would be designing this kind of circuit and if it's very small, I would not be maybe worried too much about PCB impedance. What I would be probably thinking about is if the phone antenna will not influence the circuit.

[Ghild]

hmmm I am not consider about antenna.. thank you Robert...

I have problem, my circuit only works well at some brand , example Samsung., but not at Lenovo, recording sound has static noise..