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document Urukul nonlinearity #41

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opened 2022-06-23 11:37:17 +08:00 by sb10q · 4 comments
sb10q commented 2022-06-23 11:37:17 +08:00
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https://forum.m-labs.hk/d/445-nonlinear-urukul-dds-amplitude

https://forum.m-labs.hk/d/445-nonlinear-urukul-dds-amplitude
occheung commented 2022-06-23 14:52:18 +08:00
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image
This looks nowhere as bad as the plot on the forum, even with no attenuation & ASF=1.

![image](/attachments/5d6b97ff-fd62-4cbd-915b-0c120e597342) This looks nowhere as bad as the plot on the forum, even with no attenuation & ASF=1.
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sb10q commented 2022-06-23 15:48:49 +08:00
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How was this data obtained?

How was this data obtained?
occheung commented 2022-06-23 15:49:50 +08:00
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Urukul 4410 direct attached to an oscilloscope with 50 Ohm termination in the scope. Value obtained from the scope.

Urukul 4410 direct attached to an oscilloscope with 50 Ohm termination in the scope. Value obtained from the scope.
occheung commented 2022-06-23 17:02:36 +08:00
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6d9faa7b
Added plots to demonstrate the impact of attenuation on linearity.
Chose 15dB attenuation just for consistency with the SU-Servo example, which chose 15dB attenuation to maintain linearity.

image

6d9faa7b Added plots to demonstrate the impact of attenuation on linearity. Chose 15dB attenuation just for consistency with the SU-Servo example, which chose 15dB attenuation to maintain linearity. ![image](/attachments/c19928d9-4bdb-454c-b9bb-d0a2507da195)
image.png
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Reference: sinara-hw/datasheets#41
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