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Discussion

Consider the following pairs of class and its characteristic.

Class A - Conducts the whole cycle

Class B - Conducts half the cycle

Class C - Conducts well under half the cycle

Class D - Conducts a quarter of the cycle

How many of the pairs given above are correctly matched?

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

Answer: C

The first three are correctly paired and the fourth is not, so three match. Class D is not described by a conduction angle at all: its devices switch fully on and off at a rate far above the signal frequency, and the information is in the duty cycle. Applying a classification scheme beyond the family it was devised for is the error here, and it is worth noticing that the switching classes needed a new letter precisely because the old description did not fit. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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