This being an LTspice group the starting point would be you posting your LTspice files. Not a picture of a schematic.

Usually this refers to: Proportional Integral Derivative With variations using one or more of the three. Although these days calling something a PI controller could refer to a Raspberry Pi so it is be

Sounds like you need a primer on power supply design more than how to use simulation: https://www.worldradiohistory.com/Archive-Poptronics/70s/1975/Poptronics-1975-06.pdf

Outlawed shortly after tuned circuits became practical. In the U.S., see FCC regulations, wherein it states: "2.201(f) Type B emission: As an exception to the above principles, damped waves are symbol

This was a problem for me once a while back with the 2N2907. The cure in that case was to switch to a Darlington transistor. http://davesrocketworks.com/electronics/relayer/relay.html#addenda

The file of that name that I found includes a current regulator circuit. Which doesn't work particularly well at higher currents. The model included is unusual in that it is built up from transistors,

Then the sample and hold times would be a lot shorter.

This is one of those cases where a four lead MOSFET that breaks out the substrate connection comes in handy. LTspice provides the nmos4 symbol for that. When I do that it helps but not a lot. The capa

This is what I have from long ago: https://www.amazon.com/Computer-Aided-Circuit-Analysis-Using/dp/0131625799 Back before GUIs when you had to create the netlist yourself.

ad627.cir is missing. Worse, your symbol tells LTspice to search in a directory on your computer that doesn't exist on mine: SYMATTR ModelFile C:\Users\Alexa\OneDrive\Documents\LTspiceXVII\lib\sym\Aut

After looking at the INA data sheet I would say that the chances of this circuit working with a single 3.5V supply are zero. The input voltage range requires a minimum greater than Vcc/2 and maximum l

Most instrumentation amps prefer a common mode input voltage near mid rail. You go from having a common mode input voltage near mid rail for the dual supply case to ground for the single rail. I can't

LC filter is what you mean. Plenty of resources around for designing speaker crossover filters. For example: https://www.diyaudioandvideo.com/Calculator/SpeakerCrossover/Help/

In practice the edge times will depend on the driver and load. The load (MOSFET gate ) is known so you should be approximating the driver.

I found it on the product page. I prefer a diode that prevents those high voltages to begin with. Drop a nmos symbol into a schematic and it will be "M1". You have to change that to "X1". The first le

An aspect of transistor performance not frequently found in models but the model for the STW12NK90Z does appear to include that. The clamping voltage appears to match the "BV" parameter of one of the

The data sheet says 1,700V. A very special sort of power MOSFET.

https://en.wikipedia.org/wiki/Euler%27s_formula

Magnitude and phase are just a different form of the complex frequency.

This is the wrong approach. You would be dependent on how good, or more likely bad, the models of the solar cell and battery are. Instead, model the charger and vary the input and output conditions to