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| author | Ashish Chaudhari <ashish@ettus.com> | 2015-04-21 10:40:37 -0700 |
|---|---|---|
| committer | Ashish Chaudhari <ashish@ettus.com> | 2015-04-21 10:40:37 -0700 |
| commit | 893819c87f1cc9e845e29df0c26e1d2d0012b750 (patch) | |
| tree | a300f39af94d6831df2bdee9ea0518dba949bb59 /host/docs/sync.dox | |
| parent | 625724d7f81c214e9955334860a364802be3fda9 (diff) | |
| parent | 6e918dab8c3dbdc9774389812953cc495496a8e8 (diff) | |
| download | uhd-893819c87f1cc9e845e29df0c26e1d2d0012b750.tar.gz uhd-893819c87f1cc9e845e29df0c26e1d2d0012b750.tar.bz2 uhd-893819c87f1cc9e845e29df0c26e1d2d0012b750.zip | |
Merge branch 'master' into vivado
Conflicts:
host/lib/usrp/x300/x300_clock_ctrl.cpp
Diffstat (limited to 'host/docs/sync.dox')
| -rw-r--r-- | host/docs/sync.dox | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/host/docs/sync.dox b/host/docs/sync.dox index 8c16eb046..aaae88702 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, CBX) +\subsection sync_phase_lo Align LOs in the front-end (SBX, WBX, 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 +161,9 @@ 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 + - 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 - Periodic calibration will be necessary for phase-coherent applications |