IGNOU MPH 5 2026 - Explain the terms lock range and capture range with reference to

Question

Explain the terms lock range and capture range with reference to PLL. Why is the capture range smaller than the lock range?

19 Jan 2026

Answer :

Word Count : 309

In a Phase-Locked Loop (PLL), two important frequency parameters are the lock range and the capture range. Lock Range: The lock range of a PLL is the range of input signal frequencies over which the PLL can maintain a steady-state lock once it is already locked. If the input frequency drifts slightly within this range, the PLL can adjust its output frequency through the feedback mechanism to remain synchronized with the input. Mathematically, if the free-running frequency of the voltage-controlled oscillator (VCO) is (f_0), and the input frequency is (f_i), the PLL stays locked as long as (|f_i - f_0| \leq f_L), where (f_L) is

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