In this work we propose a self-adaptive clock based\udon a ring oscillator as the solution for the increasing uncertainty\udin the critical path delay. This increase in uncertainty forces to\udadd more safety margins to the clock period which produces a\udcircuit performance downgrade. We evaluate three self-adaptive\udclock systems: free running ring oscillator, infinite impulse\udresponse filter controlled RO and TEAtime controlled ring\udoscillator. The safety margin reduction of the three alternatives is\udinvestigated under different clock distribution delay conditions,\uddynamic variation frequencies and the presence of mismatch\udbetween the ring oscillator and the critical paths and the delay\udsensors.
展开▼
