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| author | Martin Braun <martin.braun@ettus.com> | 2015-04-14 14:05:19 -0500 |
|---|---|---|
| committer | Martin Braun <martin.braun@ettus.com> | 2015-04-14 14:05:19 -0500 |
| commit | 2f760ac0f883e1de9adca48449498deab72a9359 (patch) | |
| tree | ffe52eeabe9f265dd0471b20d670091091f8dcc8 /host/docs/sync.dox | |
| parent | 2f48c9bb979c8777cc8a3d3a0de03e9cf2958b14 (diff) | |
| parent | 19716045c60f00296f24e115580da154e5ddef8d (diff) | |
| download | uhd-2f760ac0f883e1de9adca48449498deab72a9359.tar.gz uhd-2f760ac0f883e1de9adca48449498deab72a9359.tar.bz2 uhd-2f760ac0f883e1de9adca48449498deab72a9359.zip | |
Merge branch 'maint'
Conflicts:
host/lib/usrp/b200/b200_io_impl.cpp
host/lib/usrp/common/ad9361_driver/ad9361_device.cpp
host/lib/usrp/common/ad9361_driver/ad9361_device.h
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 |