Phase Locked Loops (PLL) Introduction to PLL The concept of Phase Locked Loops (PLL) first emerged in the early 1930’s.But the technology was not developed as it now, the cost factor for developing this technology was very high. Since the advancement in the field of integrated circuits, PLL has become one of the main building blocks in the electronics technology. In present, the PLL is available as a single IC in the SE/NE560 series (560, 561, 562, 564, 565 and 567) to further reduce the buying cost ,the discrete IC’s are used to construct a PLL. PLL Applications Frequency Modulation (FM) stereo decoders, FM Demodulation networks for FM operation. Frequency synthesis that provides multiple of a reference signal frequency. Used in motorspeed controls, tracking filters. Used in frequency shift keying (FSK) decodes for demodulation carrier frequencies.

pll.mdl

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