CrazyEngineers
CrazyEngineers

  • 3dB

    tusharatdce

    Member

    Updated: Oct 26, 2024
    Views: 1.1K
    can anyone tell as to why the bandwidth is always calculated as 3dB bandwidth(half power) and not any other number.?
    0
    Replies
Howdy guest!
Dear guest, you must be logged-in to participate on CrazyEngineers. We would love to have you as a member of our community. Consider creating an account or login.
Replies

  • xheavenlyx

    Member • Apr 25, 2011

    -3dB is the half power point. How is it half. Excellent question! I had to look it up but here is the best explanation:

    We get to the -3dB point when the voltage drops by 1/sqroot(2) and the power drops to -3dB.

    Why half? Well, it's just the standard, you can define by -1.5dB too, but 1/sqroot(2) is a better number to stick to.

    I still am not clear myself. If I get more information I will post it.
    Are you sure? This action cannot be undone.
    Cancel

  • tusharatdce

    Member • Apr 25, 2011

    thanks. Actually my question was this only as why is this standard half power only..?
    why not three fourth or 90% or more or even less than half..?
    Are you sure? This action cannot be undone.
    Cancel

  • xheavenlyx

    Member • Apr 26, 2011

    Yea, I could not get a clear answer to that, someone asked the same q in another forum. One guy replied: "Why not half-power?" 😀
    Are you sure? This action cannot be undone.
    Cancel

  • tusharatdce

    Member • Apr 26, 2011

    😀
    do tell us if you find the answer.
    Are you sure? This action cannot be undone.
    Cancel
Home Channels Search Login Register