andreysviyaz at gmail.com
Wed Nov 25 11:33:26 UTC 2015
Sorry for so delayed reply, I've found that I've lost subscription for this
Well, actually DC/DC were synchronized (between each other) even in the
very first UmTRX version.
On the first versions I saw spurs from DC/DC ~500 kHz at the TxPLL noise
plot (few in case of non-sync) and some other surprises.
You can see issue #42 here:
Nowadays, we use DC/DC chip TPS54560, synchronized to 541 kHz signal
(26/48) from FPGA.
No surprises noticed anymore, but actually, we chose TPS54560 because of
better efficiency and higher input voltage.
> ---------- Forwarded message ----------
> From: Sylvain Munaut <246tnt at gmail.com>
> Date: Sun, Nov 8, 2015 at 11:12 PM
> Subject: Regulator Synchronization
> To: umtrx <umtrx at lists.osmocom.org>
> I know that on the UmTRX the switching controllers ( ST L5973 ) are
> all synchronized together.
> IIRC the earlier versions of the UmTRX didn't have this and I'm
> wondering if you really noticed a difference due to this change ?
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the UmTRX