ADL5202 abnormal peak at output

Hello,

 

Issue:
When changing the amplitude
of input signal to certain value from zero, abnormal peak of a few period is observed at the beginning of output amplitude changing to certain value from zero.

Condition:

Gain is set by Parallel I/F transparent mode.

Gain is fixed to max.

Input signal is 128MHz sine wave.

Output level is 0dBm in 150 ohm.

Measured by FET probe contacting at 150 ohm termination (>>See the attachment please).

Application circuit:

Similar to Figure 55. Wideband ADC Interfacing Example Featuring One-Half of the ADL5202 and the AD9268 which is described in datasheet.

Request:

1. Could you please tell me the ways to solve this issue?

2. Could you please provide the transmission function of the internal ac-coupled feedback path? The feedback path is described in p.18 of datasheet. Would like to examine if excess compensation causes this issue.

 

Best Regards,

ADL5202abnormalpeakatoutput.xlsx
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    •  Analog Employees 
    on Aug 2, 2018 3:24 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin
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  • 0
    •  Analog Employees 
    on Aug 2, 2018 3:24 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin
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