In my current design, for the schematic and layout I've copied the design of the first version of the usb-stick with meander-antenna and matching network/balun. In the later designs of this board (for later revision of the chip I assume) I notice that Nordic has changed the discrete balun to be identical to the reference designs in the PS-document. (notable changes: instead of 3 identical 6.8nH inductors, they now have 3 different inductors 10nH, 4.7nH and 3.3nH for the QFAA/QFAB (16k ram), and 27nH, 4.7nH, 3.3nH for the QFAC (32k ram). )
Questions:
1: What are the reason for these changes in the matching network?
2: Can I just stick with my schematic/design from the PCA10000 v1.0.3 even if I upgrade to latest chip-revision of QFAA or AB? or is it advisable to update the design? Would I get better performance in any way if moving over to the latest design?
3: Is it because of different silicon-die that the QFAC has different component values? (I can't move between 16k and 32k ram without also changing component values?)
