Patent ID: 6093954
Filing Date: 2000-07-25
Classification: H01L

Abstract:
A variable delay circuit fabricated on a substrate comprising a plurality of delay stages connected in series between a signal input node and a signal output node for introducing a delay time into propagation of a signal, each of said plurality of delay stages providing a signal path and includingan input node connected to one end of said signal path,an output node connected to the other end of said signal path,a first signal line forming a part of said signal,a second signal line connected to said first signal line and covered with an insulating layer over said substrate, anda breakable signal line different in resistance from said second signal line, connected in parallel to said second signal line for providing another part of said signal path and formed on said insulating layer so as to be disconnected from said first signal line when said second signal line is caused to serve as said another of said signal path.