A: All AC amplifiers will amplify a band of frequency lets say from DC TO 1 mega Hz that will be the band of frequency that this particular amplifier can amplify. A wide band amplifier is an amplifier that surpass this band to even higher frequency to lets say 500 mega Hz that will surely qualify it as a WIDE band amplifier. It is a name to describe an amplifier that has capabilities to reach higher frequency as opposed to a general op amp
An amplifier! Amplifiers are designed for particular band-widths from fractional-Hz, and even d.c., upwards, but that band can be very wide.
A: It is a discontinue wide band amplifier 250 mega HZ I believe. Its function is to amplify those frequency with an 50 ohm output impedance
A well tested explanation of a wide range of observations is known as a Theory, such as the Theory of Gravity or the Theory of Evolution.
That depends on its purpose. Some examples:RF amplifier in IF stage of AM radio: 10KHz.RF amplifier in TV set: 6MHz.RF amplifier in IF stage of FM radio: 200KHz.An RF amplifier in a military RADAR set will probably have very narrow bandwidth to reduce jamming possibility, but wide enough to allow for doppler shift of targets.
The bandwidth should be slightly larger than the actual bandwidth of the operating frequencies involved, and should be able to operate from the lowest used frequency to the highest frequency and inclusive of the frequencies between those two parameters. Another consideration would be the application for which it's used, as there are instances where the bandwidth needs to be limited, to prevent items such as `bleed over' and for the conservation of radio spectrum. Since your question is in general terms, I can only supply a general answer, and the bandwidth of your amplifier may be required to be very narrow and limited (narrow band) or wide (wide band).
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it has a narrow band.
A theory.