Probably the most famous chip ever made was the 555. Hans Camenzind recalled how he designed it. “In 1967 designing repeatable integrated tuned circuits was impossible. I was interviewed by Signetics that year and proposed that they let me try to designe one using a phase-locked loop. “I found the PLL in a 1935 Proceedings …
Read full article: Designing The 555, by Hans Camezind