ADL5202 difference of propagation delay between no-modulation signal and 200kHz AM modulation signal

Hello,

Propagation delay between no-modulation signal and 200kHz AM modulation signal is different. Carrier frequency is 128MHz.
No-modulation signal: a few tens of nsec
AM modulation signal: a few usec.

Could you please tell me what causes this phenomenon and the how to avoid it?

Propagation delay: time between input signal arriving at input of the IC and output signal appearing at output of the IC.

Best Regards,

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