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Which detector needs no critical tuned transformer?

  • A.The ratio detector with its balanced diodes
  • B.The balanced slope detector using two tuned circuits
  • C.The phase-locked loop
  • D.The Foster-Seeley discriminator

Answer: C

A phase-locked loop needs no tuned transformer, holds its alignment and integrates onto a chip, which is why it displaced the discriminator family in consumer equipment. All three alternatives depend on carefully tuned inductive components that drift and resist integration. The advantage is one of manufacturability rather than theory, and it is a good reminder that circuit choices are often decided by production rather than performance.

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