LMS TxLO noise

Thomas Tsou thomastsou at gmail.com
Sun Jul 22 18:51:26 UTC 2012


On Sun, Jul 22, 2012 at 12:59 AM, Alexander Chemeris
<alexander.chemeris at gmail.com> wrote:
> On Sun, Jul 22, 2012 at 6:40 AM, Thomas Tsou <thomastsou at gmail.com> wrote:
>> On Sat, Jul 21, 2012 at 5:57 PM, Alexander Chemeris
>> <alexander.chemeris at gmail.com> wrote:
>>> I've started documenting this at the wiki:
>>> http://code.google.com/p/umtrx/wiki/LMS6002DCalibration#Tx_I/Q_balance_calibration
>>> Is that a good enough description for you?
>>
>> Added:
>>
>> - IQ balance correction
>> - Laurent C1 pulse
>>
>> We are below the target threshold.
>
> Great achievement!
> Is it consistent over the whole 900 band, i.e. is that the worst case?

Overall measurements are close (either above or below) to 1.5/5 for
the 900 band in general. 945 MHz is currently the best case, but that
is the frequency I spent the most time on with calibration. Do we need
to be consistently below 1.5/5 or just close?

> I guess in 1800 band we're above the threshold yet. Could you measure
> by how much we're off there?

At 1945 MHz,the best I could do was roughly 2.3/7.2 with IQ balance
and LO leakage corrections. I didn't try any 1800 band frequencies.

  Thomas




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