# Power bandwidth

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The **power bandwidth** of an [amplifier](/source/Amplifier) is sometimes taken as the [frequency range](/source/Frequency_range) (or, rarely, the upper frequency limit) for which the rated power output[1] of an amplifier can be maintained (without excessive distortion) to at least *half* of the full rated power.[2][3] (Some specifications may mandate 100% of the rated power; sometimes referring to the **full-power bandwidth**.)

It should not be confused with "half-power" bandwidth, only used in conjunction with filter [frequency response](/source/Frequency_response) curves, where it refers to -3dB points in the frequency response of a band-pass filter.

Data sheets for [operational amplifiers](/source/Operational_amplifiers) often use the term **(full-)power bandwidth** to indicate the highest frequency at which the achievable peak-to-peak output voltage swing is still equal to the [DC](/source/Direct_current) output voltage range. This is also sometimes described as the **slew-rate-limited bandwidth**. The full-power bandwidth BW is then related to the [slew rate](/source/Slew_rate) SR in volts per second and the peak-to-peak [voltage](/source/Voltage) swing V_{amp} by

- BW=\frac{SR}{\pi ~V_{amp}}

where BW is expressed in hertz. In data sheets for commonly available operational amplifiers, slew rate is usually given in volts per microsecond.

## Specifying power bandwidth

Power bandwidth may be specified as a frequency limit or shown in the form of a graph (e.g. as maximum available voltage swing versus frequency, often with power supply voltage as a [parameter](/source/Parameter)).[4]

## References

1. Audio Power Amplifier Design Handbook by Douglas Self; page 22

1. ["Answers - the Most Trusted Place for Answering Life's Questions"](https://www.answers.com/topic/power-bandwidth). *[Answers.com](/source/Answers.com)*

1. The sound reinforcement handbook by Gary Davis, Ralph Jones; page 197

1. ["Archived copy"](https://web.archive.org/web/20091228221914/http://www.nxp.com/documents/data_sheet/TDA1013B.pdf). Archived from [the original](http://www.nxp.com/documents/data_sheet/TDA1013B.pdf) on 2009-12-28. Retrieved 2010-02-06. TDA1013B power amplifier IC specifications

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Adapted from the Wikipedia article [Power bandwidth](https://en.wikipedia.org/wiki/Power_bandwidth) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Power_bandwidth?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.