Hello,
I'm using the LMH6554 in SE to Differential configuration, DC coupled connectivity.
Similar to the scheme at Figure 27 in the datasheet:
The problem I encounter is high Group Delay Variation at low input frequencies:
The input-to-output propagation delay drops from ~30nS @ ~650KHz to almost zero @ >1.5MHz.
Such a high variation causes degradation in system performance.
Please advise:
Is it an expected behavior of LMH6554?
Which circuit parameters can be trimmed in order to reduce the delay variation?
Thanks,
David.