Discussion
What does a Costas loop provide that a simple phase-locked loop cannot?
Answer: A
An ordinary phase-locked loop needs a spectral line to lock to, and a suppressed-carrier signal has none; the Costas arrangement derives an error signal from the modulation itself and so locks without a carrier. Drift immunity is a property of any loop with adequate bandwidth. Capture range depends on design rather than on topology in the way implied. And multipliers are central to its operation, not absent from it.
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