Why CMOS is a PITA - Printable Version +- Sinisterly (https://sinister.ly) +-- Forum: Computers (https://sinister.ly/Forum-Computers) +--- Forum: Hardware & Customization (https://sinister.ly/Forum-Hardware-Customization) +--- Thread: Why CMOS is a PITA (/Thread-Why-CMOS-is-a-PITA)

Why CMOS is a PITA - phyrrus9 - 04-18-2018 So, I started talking about IGFETs and CMOS the other day, and just went back to play a little more. Basically there are 4 rules to making a CMOS circuit: Only pull down with n-channel FETs Only pull up with p-channel FETs Never pull up and down simultaneously Always pull the output So, sounds simple enough, right? Yeah, until you try to implement a basic AND gate and realize its not possible. I want you to take a look at this AND2 gate and tell me if it looks familiar to you: Well it should, because that's not actually an AND gate, it's a NOT NOT AND gate...... For some comparison, here's a NAND (NOT AND) gate: Still not getting it? I'll put them side by side for you.... And that's why its a fucking pain in the ass.....