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That's actually not the case in your example. You better choose top of R4 as injection point.

Loop gain is defined the wrong way in your schematic. It's A/B, voltage at switcher output/voltage at feedback input.

Measurement setup in post #1 is o.k., problem is analyzer performance.

[QUOTE="FvM, post: 1790545, member: 152255"] That's actually not the case in your example. You better choose top of R4 as injection point. Loop gain is defined the wrong way in your schematic. It's A/B, voltage at switcher output/voltage at feedback input. Measurement setup in post #1 is o.k., problem is analyzer performance. [/QUOTE]

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