AR# 59116
|XAPP1241/XAPP589 - What is the maximum limit of G2/G1?
描述
On page 20 of (XAPP589) v2.2 the limits for G1 and G2 are listed.
However, they are incorrect:
解决方案
The logic limit of G2 is d21.However, it would saturate constantly (ovf_ab), so the limit is dependent on the system rather than the logic.
In the lab G2 has being set to d20 successfully.
However, for applications requiring a fast lock time, G2 = d18 works successfully, but G2 = d16 should be enough for most.
The relation G1<G2-2 must be respected to obtain a stable loop.
The gain is a power of 2, so increasing G2 by 1 will actually double the gain.
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| Answer Number | 问答标题 | 问题版本 | 已解决问题的版本 |
|---|---|---|---|
| 56136 | XAPP589 - XAPP1241 - All Digital VCXO Replacement (PICXO) - Design Assistant / Master Answer Record | N/A | N/A |