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In ideal CMOS logic under steady DC conditions, the input current is approximately?

  • AVery large
  • BApproximately zero except leakage
  • CEqual to output current
  • DFixed at 1 mA
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Correct Answer: B. Approximately zero except leakage
Explanation: The insulated MOS gate draws essentially no DC input current ideally; practical devices have small leakage and transient charging current.
Reference: Standard digital electronics: CMOS input characteristics
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