-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Somebody in the thread at some point said: > Dear all: > >> Did these discussions include NXP opinion in the loop? > >> I found that 1uF (I tried it initially) was enough to make a big >> difference in HF noise >stability on VB_SYS and to deal with short >> droops, so 4.7uF doesn't sound >completely crazy to me. But it is >> quite a difference from 22uF recommended by >NXP. > > The 4.7uF is our verification. I think the NXP will reply that we > must use the 22uF capacitor and I don't want to ask them.The 4.7uF > just for A5 PVT.
Well, understood I guess... it's an effective way to avoid hearing bad news :-) NXP have to target the chip's worst case load and noise, you only have to target the A5 worst case, so I guess it can all work out. But its our problem then to make sure we can switch the worst things around like GSM / GPS power with 4.7uF and not make a big spike on VB_SYS. - -Andy -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFHuTTGOjLpvpq7dMoRAo78AJ9iZWiuH3gHz5z683C1LaLVNvQqmACbBtN+ MmJqNDSONupqpT7SX4TZiSA= =qbUw -----END PGP SIGNATURE-----
