Adiabatic Switching

  • Lars Svensson


The fundamental cause of CMOS dynamic power dissipation is the organization of the energy transport in the circuit. Charging a node with a node capacitance, C, to a voltage, V, means storing a signal energy, E sig = CV 2/2, on the node. In a level-restoring CMOS circuit with rail-to-rail swing1, the signal charge, Q = CV, is drawn from the power supply at a constant voltage, V. Thus, as pointed out in Chapter 3, an energy Einj = QV = CV 2 is injected into the circuit from the power supply. The injected energy is twice the signal energy; half of it is dissipated for the other half to be delivered to its destination. When the node is pulled low, the charge is drained from the node to ground, and the other half of the injected energy is consequently dissipated. Thus, all energy drawn from the supply is used only once before being discarded.


Supply Voltage Load Capacitance Charge Time Voltage Swing Capacitive Load 
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Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • Lars Svensson
    • 1
  1. 1.Information Sciences InstituteUniversity of Southern CaliforniaUSA

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