I would like to know if, regardless of the control loop used (Voltage mode control, average current mode control, peak/valley current mode control), there is always a 90-degree phase drop at FSW/2 due to the sampling behaviour of the system ? I'm not sure because in case of an current mode control we have 2 loops so the outerloop can act as a non-sampled system.
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2\$\begingroup\$ Hello, I recommend you look at this thesis which goes deep in analyzing the impact of harmonics in the frequency response of a switching converter. \$\endgroup\$– Verbal KintCommented Dec 1, 2023 at 9:39
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\$\begingroup\$ Thank you @VerbalKint \$\endgroup\$– AnalogManCommented Dec 1, 2023 at 10:04
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2\$\begingroup\$ You can also look at this document from Richard Tymerski in which the author details the frequency response of a basic converter. \$\endgroup\$– Verbal KintCommented Dec 1, 2023 at 10:16
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\$\begingroup\$ Great, thanks again, I will read them both … Because I'm a bit puzzled about the phase drop at Fsw/2 , the real reason ... for me ( in reflection ) it's purely due to Shanon's theorem (if sampling frequency < 2*max freq ,we're not able to reconstitute the sampled information so it's normal to have this phase drop ... but how much phase drop , how tondetermine that and so on ... I'll dwell on the documents you sent \$\endgroup\$– AnalogManCommented Dec 1, 2023 at 10:28
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