Phase Locked Loop Circuits
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چکیده
1. Definition. A PLL is a feedback system that includes a VCO, phase detector, and low pass filter within its loop. Its purpose is to force the VCO to replicate and track the frequency and phase at the input when in lock. The PLL is a control system allowing one oscillator to track with another. It is possible to have a phase offset between input and output, but when locked, the frequencies must exactly track.
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Closed-Form Analytical Equations to Transient Analysis of Bang-Bang Phase-Locked Loops
Due to the nonlinear nature of the Bang-Bang phase-locked loops (BBPLLs), its transient analysis is very difficult. In this paper, new equations are proposed for expression of transient behavior of the second order BBPLLs to phase step input. This approach gives new insights into the transient behavior of BBPLLs. Approximating transient response to reasonable specific waveform the loop tran...
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In this paper, a high speed delay-locked loop (DLL) architecture ispresented which can be employed in high frequency applications. In order to design the new architecture, a new mixed structure is presented for phase detector (PD) and charge pump (CP) which canbe triggered by double edges of the input signals. In addition, the blind zone is removed due to the elimination of reset signal. Theref...
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Index Terms Computer Science [1] Fahim, A. M. And Elmasry, M. I. 2003. A Fast Lock Digital Phase-locked-loop Architecture For Wireless Applications, Ieee Transactions On Circuits And Systems-ii: Analog And Digital Signal Processing, Vol. 50, No. 2, Feb. , 2003. [2] Saber, M. , Jitsumatsu,y. And Khan, M. t. a. 2010. Design And Implementation Of Low Power Digital Phase-locked Loop, Proceedings Of...
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The fundamental design concepts for phase-locked loops implemented with integrated circuits are outlined. The necessary equations required to evaluate the basic loop performance are given in conjunction with a brief design example. NOTE This document contains references to obsolete part numbers and is offered for technical information only.
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