What is propagation delay in CMOS VLSI circuits? All Questions › Category: VLSI CMOS › What is propagation delay in CMOS VLSI circuits? 0 Vote Up Vote Down Chetan Shidling asked 4 years ago I need short information. 1 Answers 0 Vote Up Vote Down chetan shidling answered 4 years ago Propagation Delay (tpLH, tpHL) is the delay measured from the time the input is at 50% of its full swing value to the time the output reaches its 50% value. Propagation delay = 50% of time (output) / 50% of time (input)