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Inquiry for specification of time delay device

I found 'Delay Control Modulation Bandwidth' specification in HMC910 datasheet.

But, I can not understand meaning of 'Delay Control Modulation Bandwidth'

Please, explain meaning of 'Delay Control Modulation Bandwidth'.

Delay Control Modulation Bandwidth of HMC910 is 10MHz and Delay Control Modulation Bandwidth of HMC911 is 1.6GHz.

Please, explain difference between two spec.

Thanks in advance.