Gert, I am curious. We always try to use power planes along with ground planes. The added capacitance, it was concluded, would be beneficial. Why asymmetric?
Scott [email protected],Internet writes: >Hello Jim, > >For ground power planes make a definite selection between 1 and 2: >1. make them the same potential for all frequencies up to and over 1 Ghz > Use the dielectric properties of the PCB te create a capacitor between >corr. power and gnd planes, , and add sufficient decoupling caps. pref >SMD of DIFFERENT values (due to resonance effects) > >2. Make Power and GND asymmetric i.e. GND plane and power traces. > Use ferrites and/or coils to isolate RF-currents in power and add >decoupling caps to decouple LOCAL only so as to prevent RF-currents in >the supply to spread over the board. > > >Regards, > >Gert Gremmen Ing. >
