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For CMOS logic, dynamic power dissipation is approximately proportional to which expression?

  • ACL VDD² f
  • BCL/VDD
  • CVDD/f
  • D1/(CL f)
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Correct Answer: A. CL VDD² f
Explanation: A common approximation is Pdynamic ≈ αCLVDD²f, where α is switching activity. Thus power rises strongly with supply voltage and switching frequency.
Reference: Standard digital electronics: CMOS dynamic power
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