Power bandwidth

From Wikipedia, the free encyclopedia
Jump to: navigation, search

The power bandwidth of an amplifier is sometimes taken as the 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 as the full-power bandwidth.)

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

Operational amplifiers often use the term (full-) power bandwidth to refer to the frequency limit for the peak output voltage rather than power remaining up to the limit given for DC output voltage capability.

Specifying power bandwidth[edit]

Power bandwidth may be specified as a frequency range or as a graph.[4]


  1. ^ Audio Power Amplifier Design Handbook by Douglas Self; page 22
  2. ^ http://www.answers.com/topic/power-bandwidth
  3. ^ The sound reinforcement handbook By Gary Davis, Ralph Jones; page 197
  4. ^ http://www.nxp.com/documents/data_sheet/TDA1013B.pdf TDA1013B power amplifier IC specifications