power bandwidth การใช้

Another reason for very low frequency material can be a warped disk : its undulations produce frequencies of only a few hertz and present day amplifiers have large power bandwidths.
A graph of a filter's gain magnitude, illustrating the concept of " 3 dB at a voltage gain of 0.707 or half-power bandwidth.
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.
Where " f r " is the resonant frequency, ? " f " is the resonance width or full width at half maximum ( FWHM ) i . e . the bandwidth over which the power of vibration is greater than half the power at the resonant frequency, " ? r " = 2 " f r " is the angular resonant frequency, and ? " ? " is the angular half-power bandwidth.