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Why the difference ramp rate between 60GHz chip and 77GHz chip

Other Parts Discussed in Thread: IWR1843, IWR6443, IWR6843, IWR1443

Hi community member,

I saw mmwave IC's datasheets (IWR1443, IWR1843, IWR6443, IWR6843).

According to these datasheet, the each ramp rate is as below:

  • IWR1443, IWR1843(77GHz) : Max 100MHz/us
  • IWR6443, IWR6843(60GHz) : Max 250MHz/us

Is it the reason that IWR6xxx(60GHz) is newer devices than IWR1xxx?
I'm interested in why is the difference.

Best regards.