Editing Negative-feedback amplifier (section)

=== Summary of terms ===

*[[Open-loop gain]] = <math>A_\text{OL}</math><ref>{{Cite web|url=http://cc.ee.ntu.edu.tw/~lhlu/eecourses/Electronics2/Electronics_Ch9.pdf#page=2|title=The General Feedback Structure|last=Lu|first=L. H.|archive-url=https://web.archive.org/web/20160605063422/http://cc.ee.ntu.edu.tw/~lhlu/eecourses/Electronics2/Electronics_Ch9.pdf#page=2|archive-date=2016-06-05|url-status=dead}}</ref><ref>{{Cite book|title=Audio Power Amplifier Design|last=Self|first=Douglas|date=2013-06-18|publisher=Focal Press|isbn=9780240526133|edition=6|location=New York|page=54}}</ref><ref>{{Cite book|title=The Art of Electronics|last1=Horowitz|first1=Paul|last2=Hill|first2=Winfield|date=1989-07-28|publisher=Cambridge University Press|isbn=9780521370950|edition=2|page=[https://archive.org/details/artofelectronics00horo/page/23 23]|url-access=registration|url=https://archive.org/details/artofelectronics00horo/page/23}}</ref><ref>{{Cite web|url=http://www.analog.com/media/en/training-seminars/tutorials/MT-044.pdf|title=MT-044 Op Amp Open Loop Gain and Open Loop Gain Nonlinearity|publisher=[[Analog Devices]]|quote=β is the feedback loop attenuation, or feedback factor ... noise gain is equal to 1/β}}</ref>
* Closed-loop gain = <math>\frac{A_\text{OL}}{1 + \beta \cdot A_\text{OL}}</math>
* Feedback factor = <math>\beta</math>
* Noise gain = <math>1 / \beta</math>{{Dubious|date=January 2017|reason="the noise gain and the 1/β curve are the same—until they intercept with the gain-magnitude curve. After that, the noise gain rolls off with the amplifier open-loop response but the 1/β curve continues on its path." - Jerald Graeme|One over beta}}
*[[Loop gain]] = <math>-\beta \cdot A_\text{OL}</math>
* Desensitivity factor = <math>1 + \beta \cdot A_\text{OL}</math>