Loop gain

<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Phase_margin/KrPsEtVo">Phase margin</a> and <a href="/facts/Gain_margin/xcF1ej98">gain margin</a></li>
<li><a href="/facts/Nyquist_plot/J8rxK4yA">Nyquist plot</a></li>
<li>In telecommunications, the term "loop gain" can refer to the total usable <a href="/facts/Power_(physics)/mkaEyRnn">power</a> gain of a <a href="/facts/Carrier_signal/ae98pBlY">carrier</a> <a href="/facts/Terminal_(telecommunication)/GTHNGWI5">terminal</a> or two-wire <a href="/facts/Repeater/JTkWvTEP">repeater</a>. The maximum usable gain is determined by, and may not exceed, the losses in the closed path.</li>
<li><a href="/facts/Negative-feedback_amplifier/zQSRBReJ">Summary of negative feedback amplifier terms</a></li></ul>

<h2 id="external-links">External links</h2>
<ul><li><a href="http://www.linear.com/solutions/5587">Loop Gain and its Effects on Analog Circuit Performance</a></li>
<li><a href="https://kenkundert.com/docs/cd2001-01.pdf">Striving for Small-Signal Stability</a> Ieee Circuits and Devices Magazine, vol. 17, no. 1, pp. 31-41, January 2001.</li></ul>

<p> This article incorporates <a href="/facts/Copyright_status_of_works_by_the_federal_government_of_the_United_States/Q1jvr96g">public domain material</a> from <a href="https://web.archive.org/web/20220122224547/https://www.its.bldrdoc.gov/fs-1037/fs-1037c.htm"><i>Federal Standard 1037C</i></a>. <a href="/facts/General_Services_Administration/Np3opv9x">General Services Administration</a>. Archived from <a href="https://www.its.bldrdoc.gov/fs-1037/fs-1037c.htm">the original</a> on 2022-01-22. (in support of <a href="/facts/MIL-STD-188/D5rsvdsW">MIL-STD-188</a>).
</p>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>"TI Precision Labs - Op-amps - Stability 2" (PDF). To find the magnitude of AolB, we can simply subtract 1/B from Aol. <a href="https://training.ti.com/system/files/docs/1332%20-%20Stability%202%20-%20slides.pdf" target="_blank">https://training.ti.com/system/files/docs/1332%20-%20Stability%202%20-%20slides.pdf</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>"MT-033 TUTORIAL Voltage Feedback Op Amp Gain and Bandwidth" (PDF). The difference between the open-loop gain and the closed-loop gain is known as the loop gain <a href="http://www.analog.com/media/en/training-seminars/tutorials/MT-033.pdf" target="_blank">http://www.analog.com/media/en/training-seminars/tutorials/MT-033.pdf</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>"Operational amplifier gain stability, Part 2: DC gain-error analysis" (PDF). ... shows the simplified open-loop gain ... along with the closed-loop gain ... The difference between these two curves is the loop gain, β×AOL. <a href="http://www.ti.com/lit/an/slyt374/slyt374.pdf" target="_blank">http://www.ti.com/lit/an/slyt374/slyt374.pdf</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
</ol>

Loop gain open-in-new

Loop gain