LTspice tutorial - Feedback loop simulation in linear and switching systems

#ltspice In this tutorial I take a look at stability issues in power supply circuits - namely feedback loops; How do you simulate the open loop response of a closed loop using LTspice? I explore this topic in both linear and non-linear systems like switching supplies. Its an interesting analysis technique that can provide a lot of value if you know what to look for!

Simulation links: https://drive.google.com/open?id=18PBPLCpDVF175OnRZkRieokOOlXGhM3w

Relevant technical documents: https://www.analog.com/en/technical-articles/ltspice-extracting-switch-mode-power-supply-loop-gain-in-simulation-and-why-you-usually-don-t-need.html http://www.ti.com/lit/an/snva020b/snva020b.pdf

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Tutorial series EP1-Getting started: https://youtu.be/JRcyHuyb1V0 EP2-AC simulation and the Baxandall tone control circuit: https://youtu.be/P_ENvucaZkI EP3-.param and .step directives: https://youtu.be/ARE5nwiHI0Q EP4-How to import libraries and component models: https://youtu.be/8V5XabccFaE Ep5- Stock example simulations to play with: https://youtu.be/MwfeMjcM4zY Ep6- Basics of FFT analysis and .four statment: https://youtu.be/rVAvW1Jh2AE EP7- Dependent voltage and current sources https://youtu.be/Jn8mJG3qeoo Ep8- Turning a datasheet into a component model https://youtu.be/0smuo8bMRn4 EP9- Independent voltage and current sources https://youtu.be/nPZ7vneN3v8 Ep10- .wave statement and audio file processing https://youtu.be/mdJm-TzrBsA Ep11 The effect of temperature on your circuit https://youtu.be/VzxnNrOMcMo EP12 Modeling a DC brushed motor https://youtu.be/Wc4XzTrWSpo Ep13- Worst Case, Monte Carlo and Gaussian statistics circuit analysis https://youtu.be/NdGqboW2VcY EP14 - Digital circuits and logic gates https://youtu.be/JttE2NObDPM EP15- SMPS EMI and electrical noise and filters https://youtu.be/QEAzcaiBrpY EP16- Feedback loop simulation https://youtu.be/X4yaBwaO1gk Ep17 - Verifying Simulation Models https://youtu.be/DSDiIkKQaAE Ep18 - Simulating Capacitors https://youtu.be/QpWPTolhfEo Ep 19 - Simulating Inductors https://youtu.be/65fNDRows90 EP 20 - Noise simulations https://youtu.be/Dh5XmFXlljI Ep21 - Models and Libraries https://youtu.be/GUFMfSlD2AM

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