From Wikipedia, the free encyclopedia. 3DB or "3dB" may refer to: 3 dB point, the cutoff frequency of an electronic amplifier stage at which the output power has dropped to half of its mid-band level. 3DB (Melbourne) an Australian radio station now broadcasting as KIIS 101.1.
So, what is 3 dB?
Half power point. The half power point of an electronic amplifier stage is that frequency at which the output power has dropped to half of its mid-band value. That is a level of -3 dB. This is therefore also known as the −3 dB bandwidth.
Why the cutoff frequency is taken for 3dB?
This point is called the cutoff frequency. So, lots of systems are designed to operate in normal conditions until they met the cutoff frequency when they lose at maximum 3db. If you operate with signal above that frequency the signal can be more attenuated. More info in Wikipedia about continuous low pass filters.
What is meant by 3 dB bandwidth?
Rating is available when the video has been rented. Published on Jul 15, 2017. This is therefore also known as the 3 db bandwidth. A high pass amplifier stage will have only the lower half power point. Bandwidth of an amplifier is usually defined as the difference between lower and upper half power points.