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| author | Tom Tsou <tom.tsou@ettus.com> | 2015-09-04 12:56:32 -0700 |
|---|---|---|
| committer | Martin Braun <martin.braun@ettus.com> | 2015-09-08 09:23:47 -0700 |
| commit | 6e4bb3428297fd202bf784ceec28ddafa89f90a0 (patch) | |
| tree | d18ecdaa40f73af647c9ab373ee33bbf7b21a35a /host/docs/sync.dox | |
| parent | 156b75cd703d83927c0e8d3b0e011597b873db51 (diff) | |
| download | uhd-6e4bb3428297fd202bf784ceec28ddafa89f90a0.tar.gz uhd-6e4bb3428297fd202bf784ceec28ddafa89f90a0.tar.bz2 uhd-6e4bb3428297fd202bf784ceec28ddafa89f90a0.zip | |
docs: Update WBX phase sync capability
Assume after retune that WBX phase ambiguity is unknown. WBX daughterboard
guarantees 180 phase ambiguity for some, but not all, frequencies.
Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
Diffstat (limited to 'host/docs/sync.dox')
| -rw-r--r-- | host/docs/sync.dox | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/host/docs/sync.dox b/host/docs/sync.dox index aaae88702..59f849e1a 100644 --- a/host/docs/sync.dox +++ b/host/docs/sync.dox @@ -152,7 +152,7 @@ metadata should have a time spec set: : size_t num_tx_samps = tx_streamer->send(buffs, samps_to_send, md); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -\subsection sync_phase_lo Align LOs in the front-end (SBX, WBX, UBX) +\subsection sync_phase_lo Align LOs in the front-end (SBX, UBX) Using timed commands, multiple frontends can be tuned at a specific time. This timed-tuning ensures that the phase offsets between VCO/PLL @@ -161,7 +161,6 @@ chains will remain constant after each re-tune. See notes below: - There is a random phase offset between any two frontends - This phase offset is different for different LO frequencies - This phase offset remains constant after retuning - - Due to a divider, WBX phase offset will be randomly +/- 180 deg after re-tune on all USRPs. - Due to a divider, UBX phase offset will be randomly +/- 180 deg after re-tune on N200/N210. On X300/X310, phase sync with UBX fully works. - This phase offset will drift over time due to thermal and other characteristics |