un ▁off ▁as ▁N X P ▁Sem icon duct ors . ▁ ▁But ▁two ▁years ▁later ▁Sign et ics ▁lost ▁its ▁way ▁and ▁Cam enz ind ▁took ▁a ▁leave ▁of ▁absence ▁and ▁worked ▁from ▁home . ▁ ▁He ▁then ▁started ▁Inter design , ▁a ▁sem icon duct or ▁design ▁company , ▁which ▁he ▁head ed ▁for ▁seven ▁years ▁before ▁s elling ▁out ▁to ▁Ferr anti . ▁Following ▁the ▁sale ▁of ▁Inter design , ▁Cam enz ind ▁became ▁an ▁independent ▁analog ▁IC ▁design ▁consult ant . ▁ ▁During ▁his ▁career ▁Cam enz ind ▁designed ▁the ▁first ▁integrated ▁class ▁D ▁ampl ifier , ▁introduced ▁the ▁IC ▁phase - locked ▁loop , ▁invent ed ▁the ▁sem ic ustom ▁IC , ▁and ▁created ▁the ▁legend ary ▁ 5 5 5 ▁timer . ▁By ▁ 2 0 0 6 , ▁he ▁had ▁designed ▁ 1 4 0 ▁standard ▁and ▁custom ▁IC s . ▁ ▁Books ▁ ▁Cam enz ind ▁wrote ▁three ▁books ▁and ▁numerous ▁technical ▁articles . ▁His ▁last ▁book , ▁Much ▁A do ▁About ▁Al most ▁Nothing , ▁published ▁in ▁February ▁ 2 0 0 7 , ▁is ▁a ▁general ▁audience ▁book ▁about ▁the ▁history ▁of ▁electron ics . ▁Other ▁books ▁include , ▁Design ing ▁Anal og ▁Ch ips ▁and , ▁under ▁the ▁pen ▁name ▁John ▁P enter , ▁he ▁also ▁wrote , ▁Circ um st ant ial ▁Ev idence , ▁a ▁book ▁about ▁religion . ▁ ▁References ▁ ▁External ▁links ▁Design ing ▁Anal og ▁Ch ips ▁official ▁website ▁Much ▁A do ▁About ▁* Al most *