A phase-locked loop or phase lock loop (PLL) is a control system that generates an output signal whose phase is fixed relative to the phase of an input signal. Keeping the input and output phase in lockstep also implies keeping the input and output frequencies the same, thus a phase-locked loop can also track an input frequency.

Phase-locked loop (PLL) circuits exist in a wide variety of high frequency applications, from simple clock clean-up circuits, to local oscillators (LOs) for high performance radio communication links, and ultrafast switching frequency synthesizers in vector network analyzers (VNA).

2020年8月10日 · 本文探讨了FPGA中PLL的原理与应用，通过Altera Cyclone IV FPGA的实例，详细解析了PLL的配置与使用，包括PLL核心数量、最大倍频及内部时钟树的特性，展示了Verilog代码实现及测试结果。

2020年10月27日 · 本文详细介绍了PLL锁相环的基本概念，包括locked和gatalocked信号的作用及特点，并深入解析了PLL的工作原理，涉及鉴相鉴频器PFD、低通滤波器LPF、压控振荡器VCO等核心组件。

The synthesizer works in a phase-locked loop (PLL), where a phase/frequency detector (PFD) compares a fed back frequency with a divided-down version of the reference frequency (Figure 1). The PFD’s output current pulses are filtered and integrated to generate a voltage.

What Is Phase Locked Loop? The phase locked loop or PLL is an electronic circuit with a voltage controlled oscillator, whose output frequency is continuously adjusted according to the input signal’s frequency. A Phase locked loop is used for tracking phase and frequency of the input signal. It is a very useful device for synchronous ...

Phase-locked loops can be used, for example, to generate stable output high frequency signals from a fixed low-frequency signal. Figure 1A shows the basic model for a PLL. The PLL can be analyzed as a negative feedback system using Laplace Transform theory with a forward gain term, G(s), and a feedback term, H(s), as shown in Figure 1B.

2024年11月8日 · PLL （Phase-Locked Loop，锁相环）是一种广泛应用于通信系统、频率合成器和时钟恢复电路中的重要电路。 下面详细介绍 PLL 的原理、各个参数的含义以及最终输出频率的计算方式。

2024年5月26日 · A Phase-Locked Loop (PLL) is a critical component in many electronic systems, used for synchronizing signals, frequency synthesis, and signal recovery. This blog provides a detailed explanation of the PLL, its operation, and the underlying theory, including relevant equations and diagrams.

Phase-locked loops (PLLs) are one of the basic building blocks in modern electronic systems. They have been widely used in com-munications, multimedia and many other applications. The theory and mathematical models used to describe PLLs are of two types: linear and nonlinear.