Does any one have good references on multi-layer pcb design optimisation  to 
reduce
micro switching noise pick-up
We are operating a micro (switching speed 2 MHz) on a PCB with 72 dB of gain
in the 5 to 1000 MHz range and need to keep the noise pick to less than -90 dBm 
we currently 
have achieved -75 dBm micro noise

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