Wednesday, October 12, 2011

10.4 Propagation Delay and the Digital Abstraction

  • Example inverters connect in series:













  • Characteristic of ideal and actual inverters:



  • tpd,1-0 is the propagation delay through inverter A for a 1 to 0 transition
  • tpd,0-1 is the propagation delay through inverter A for a 0 to 1 transition
  • tpd,1-0 and tpd,0-1 delays are not necessarily equal
  • For simplicity, we characterize digital gates by a single delay, propagation delay tpd:

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