2007-03-16 21:09:32 · 5 answers · asked by shahid k 1 in Science & Mathematics ➔ Engineering
Everything else unchanged, to double the transmission rate you need to either double the bandwidth or quadruple the signal power.
It may be a common case but is NOT generally true that the gain-bandwidth product of an amplifier is constant. That's only true for a low-pass DC-coupled single-pole amplifier such as op-amps when DC-coupled. When AC couple, a low-pass amp becomes band-pass for which gain-bandwidth is meaningless. And when the signal frequency exceeds the frequencies of more than one pole, the gain-bandwidth product is no longer constant; instead, it goes down at 10 dB per decade of frequency per each of the poles passed beyond the first pole.
2007-03-16 23:04:54 · answer #1 · answered by sciquest 4 · 0⤊ 0⤋
Is the basis of your question related to computers, or to radio? Signal power has very little to do with bandwidth. A CW (Continuous Wave) signal, such as a Morse code signal is only a few Hz wide, but the carrier wave it is being sent by can have a power level of 1000 watts. Bandwidth is a measure of modulation. How wide the transmitted signal is, measured in Kilohertz, is how much bandwidth the signal takes of radio spectrum space. As an example, a commercial FM transmission, including the guard bands is 200 KHz wide.
2007-03-16 21:48:36 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Bandwidth is usually defined as the frequency range, or the difference between the two frequencies where signal power has degraded by 50% (-3 db). When gain is defined as ratio of power output to power input of an amplifier, the gain-bandwidth product of the amplifier is constant.
2007-03-16 21:52:08 · answer #3 · answered by Helmut 7 · 0⤊ 0⤋
Bandwith is how much space you have for someone to access a webpage/picture you have. So in free spaces, there isn't that much bandwidth. Every view is a piece of bandwidth.
Signal power would be in relation to wireless internet/wireless anything. The more power you have, the less likely your signal will drop.
There is no relation to the two as far as I know.
2007-03-16 21:13:52 · answer #4 · answered by Anonymous · 0⤊ 0⤋
The Spectral Power Density is the amount of power in a given bandwidth. Usually given in dB/Hz.
We usually talk about the Spectral Density when describing noise measurements.
2007-03-18 03:39:39 · answer #5 · answered by b007a 1 · 0⤊ 0⤋