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Open loop gain, puzzler 7

Posted by: treez on

Hello,

In Puzzler 7 on the powerint.com website, i am confused because Answer 1 (a) states...

"a) The plot shows open loop gain and phase measurements of the system"

...but i do not understand how this can be the "open loop" gain depicted in the graph.

...is it not the closed loop gain?

grateful for any reply

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Submitted by PI-Surak on 01/05/2009
This is a plot of the total gain of loop. It is common to confuse closed loop gain with open loop gain. Open loop gain includes all the DC and AC gain blocks around the loop and is the best way to characterize the loop from DC to beyond gain crossover. Closed loop gain plot may not show conditional stabilty issues among other key aspects to stability.