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Q&A Noise from oscillator on top layer to clock on bottom layer with VCC & GND layers between

What effect does an oscillator potentially have on a SPI clk signal if the oscillator is on the top layer, with GND and VCC layer in between on a four layer board. I know running it on the same lay...

2 answers  ·  posted 11mo ago by Hawk2020‭  ·  last activity 11mo ago by Nick Alexeev‭

#1: Initial revision by user avatar Hawk2020‭ · 2023-12-01T16:07:53Z (11 months ago)
Noise from oscillator on top layer to clock on bottom layer with VCC & GND layers between
What effect does an oscillator potentially have on a SPI clk signal if the oscillator is on the top layer, with GND and VCC layer in between on a four layer board. I know running it on the same layer within a certain distance will have coupling effects that could cause noise and the 3W rule. I don't see people talking about different layers as much though. The clock is on the bottom like in the picture below. I know speed of oscillator and clock will likely determine if it will actually cause issues, but I am wondering about the general physics/practical noise that could be caused. 

![Clock Signal on Bottom Layer below Oscillator](https://electrical.codidact.com/uploads/4309q4tpqu0s8bj98kfbtb3wxxw6)