Half power point

Encyclopedia : H : HA : HAL : 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 level.

This occurs when the output voltage has dropped by 3dB and the power has dropped by 6dB or halved. A bandpass amplifier will have 2 half power points, whilst a low pass amplifier will have only one. A high pass amplifer stage will have only the lower half power point.

The bandwidth BW of an amplifier is usually defined as the difference between the lower and upper half power points. This is therefore also known as the −3 dB BW.

From Wikipedia, the Free Encyclopedia. Original article here. Support Wikipedia by contributing or donating.
All text is available under the terms of the GNU Free Documentation License See Wikipedia Copyrights for details.