Voltage-Dependent Voltage Source (e)
In this post, we’ll take a look at a sometimes overlooked SPICE element: the voltage-dependent voltage source. This is a powerful component that can be used to quickly simulate the ideal behavior of circuits, specifically for modeling ideal operational amplifiers. This is especially useful for when you're not yet ready to dive into real SPICE models. Using LTspice, we’ll demonstrate how to use the voltage-dependent voltage source (represented by the symbol "E" in LTspice) to emulate an ideal op-amp. We’ll then gradually reduce the gain of the voltage-controlled voltage source to observe how the op-amp’s open-loop gain influences the output signal.
Seriously, Make Your Own Symbols & Footprints
In this post, I’ll highlight the two main problems with using premade symbols and footprints - whether they come from built-in software libraries (like those in Altium Vault or KiCad) or are downloaded from the internet. While it might seem like a time-saver, it’s often much more reliable to create your own. Most datasheets provide detailed and accurate information to help you build correct symbols and footprints with minimal effort.
If you still choose to use premade components, make sure to thoroughly review every symbol and footprint yourself. A quick check now can save you days of debugging and a lot of wasted time and money down the line.