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Update Errata after more testing

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David Shah 2016-12-24 13:37:12 +00:00
parent 05f8b50536
commit e009eee0bf
1 changed files with 5 additions and 1 deletions
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hardware/ERRATA.md
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@ -7,4 +7,8 @@ dongle. Ideally another connector should be used.
- Trace widths will need to be adjusted to meet impedance requirements depending on your stackup.
`rftool_impedances.png` shows impedance control requirements. Green is 50Ω single ended; blue is 50Ω differential
and yellow is 75Ω differential. The USB 3 pairs were not included in this diagram but should be 100Ω differential.
- It is not possible to use both receive channels simultaneously as channel 1 uses ports 1A and 1B; whereas 2 uses port 2C
and the AD9361 does not support using different port letters at the same time. Ideally the design should be changed
so the second LNA connects to 2B; or the first LNA connects to 1C.
- The ENABLE pin of the Skyworks LNAs (pin 6 of U2 and U21) is active low but was mistakenly connected to +3V rather than
ground. Cutting the trace going to this pin enables the LNAs to work properly.