The present invention discloses an on chip decoupling capacitor structure having a first decoupling capacitor with one electrode formed in the conductively doped silicon substrate and a second electrode made of conductively doped polysilicon. The second electrode is a common electrode to a second decoupling...http://www.google.es/patents/US5304506?utm_source=gb-gplus-sharePatente US5304506 - On chip decoupling capacitor
