This is the clearest video on CMOS Tech on RU-vid! No wonder it has zero dislikes. Thank you sir! For clearing my concepts in 7 minutes what I couldn't do in 7 months XD
Thank you very much for these visuals. Until now I was just mugging up things for CMOS but now i clearly understand what is actually happening inside. Great work!
Many thanks for detailed explanation. Only after your video it was clear how Input and Output for logic gates works. Even after several times reading Harris and Harris book, it was really challenging to understand the current flow.
Yes, the Harris & Harris book works well as a reference -- it has all the information you need in compact form. The video is more like a college lecture, giving you time to digest the basic principles. In a good college course, the lecture and textbook are complementary.
Ok thank you, i never understood why the PMOS gets conductive when you apply 0V at its gate, allways thought you need a negative voltage, but thanks to your video, you only need a negative potential difference between source and gate. (source is connected to bulk).
Awesome video! I have one question, and I am relatively new to this, but can this be used to switch between two different power sources? Instead of having 0V and 1V as an output, could it switch between voltage levels from two different battery sources using one control voltage? It would be like an SPDT switch. I want to avoid using a relay or 4 transistors in an H-bridge setup. Thanks!
No, the CMOS inverter is just one tiny component among millions in an integrated circuit. You're looking for discrete power components. You seem to know a lot about them.
Thanks for this great Video, I have one question! I have a computer science background and still struggle with basic concepts like current. In 5:20 (Input=1V) you say "A conducting path connects 0 Volts to the output. I have a hard time imagine, what does 0 Voltage mean? Does it mean no current is flowing at all? Or just a small amount? I think i have a problem with the concept of a Supply of 0 Voltage (nmos) which creates a conductiv path to the output. If basically nothing gets "pushed" (electrons) how can there be a flow of current?
Super nice video! I was wondering what's in between the substrate and the metal connections? It looks like there is some gap in between but this has to be filled with something in a IC, right? Thanks a lot!
A hole is cut through the oxide and the metal connects directly to the silicon. In some cases extra dopant is implanted/diffused into the silicon where the metal makes contact.
Resistors and capacitors are not involved in CMOS inverter operation; there is no need for them. However, there is parasitic (unwanted) resistance in the semiconductor materials and parasitic capacitance in the P-N junctions that slow down switching between the 0 and 1 states.
A donor atom donates a negatively charged mobile electron to the conduction band. The fixed-in-place donor atom becomes positively charged when it loses an electron.
The DESCRIPTION section provides a little background on N-type and P-type silicon. For more background information, you'll need to consult Wikipedia or your textbook.
