Digital IC Design 3: NMOS vs PMOS: one tap opens on 1, the other on 0

NMOS vs PMOS: one tap opens on 1, the other on 0. Digital IC Design, from zero: Module 1, video 3. Explained simply, with nothing assumed. Every step is derived on screen, and every number is checked in ngspice on the open-source GF180 and SKY130 processes. 🧩 Puzzle at the end: put your answer in the comments. It's revealed in the next video. Chapters 0:00 Last time's puzzle 1:01 A puzzle 1:35 Two kinds of tap 2:09 Inside the PMOS 3:05 Same equations, mirrored 3:48 How much weaker? 5:51 Making them equal 6:37 Which end is the source? 7:39 Why NMOS alone fails 9:28 The complementary answer 10:19 What if we swap them? 11:58 Tech spotlight 12:25 Interview trap 13:01 Recap 13:42 What we assumed 14:08 Check question 14:52 Puzzle to take away Free circuit tools: https://siliconverify.com #VLSI #DigitalICDesign #CMOS #Semiconductors #GATE