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      Question

      Which statement is FALSE for PLL used for demodulation

      of FM?
      A PLL uses feedback system thus increase the bandwidth. Correct Answer Incorrect Answer
      B PLL uses feedback to reduce noise power at output of demodulator. Correct Answer Incorrect Answer
      C A PLL demodulator uses negative feedback system for demodulation. Correct Answer Incorrect Answer
      D PLL uses feedback system thus reducing the bandwidth. Correct Answer Incorrect Answer

      Solution

      In a Phase-Locked Loop (PLL) used for FM demodulation, the loop operates as a negative feedback system. Its main advantage is that it reduces noise power at the demodulator output, which makes PLL-based FM demodulation superior to simple slope detection. However, PLL does not increase the bandwidth; instead, the loop bandwidth is controlled and usually limited to track the FM signal while rejecting unnecessary noise. So, the false statement is: “PLL uses feedback system thus increase the bandwidth.”

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