The Architecture, Basics and Use of Phase Locked Loops

Explore the basic architecture and principal operation of phase-locked loops, or PLLs, and their use in wired and wireless communication systems in this detailed article from Analog Devices. This article also provides an example of the implementation of a local oscillator for the transmit section of a GSM handset, using the ADF4111 Frequency Synthesizer and the VCO190-902T Voltage-Controlled Oscillator. Read on to learn more about PLL concepts, structure and implementation.

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