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Consider the following pairs of property and the family it favours.

Very high input impedance - Field effect

High transconductance per milliamp - Bipolar

Easy paralleling in power stages - Field effect

Freedom from static damage - Field effect

How many of the pairs given above are correctly matched?

  • A.Only one
  • B.Only two
  • C.All four
  • D.Only three

Answer: D

The first three are correctly paired and the fourth is not, so three match. Static damage is a field effect weakness rather than a strength, and follows directly from the insulated gate that gives the family its high input impedance. That the same structural feature produces the greatest advantage and the greatest fragility is worth holding together.

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