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Are power planes in a 4 layer PCB any good as a capacitor?
Can it work as one big bypass capacitor?
A look at an discussion on PCB layer stackups, and some measurements on 4 and 8 layer PCB power planes with different prepreg thicknesses and how well they work as a capacitor.
https://www.xilinx.com/support/documentation/application_notes/xapp623.pdf
https://www.researchgate.net/publication/242415439_High_Performance_FPGA_Bypass_Networks
Forum HERE
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