This paper investigates the design and performance of the PLL (Phase Locked Loop). The proposed PLL designed with PFD (Phase Frequency Detector), CP (Charge Pump), first order Low Pass Filter and CS-VCO (Current Starved-Voltage Control Oscillator), in this paper the designed PFD used for proposed PLL is free from dead zone. The VCO used for the designed PLL shows larger tuning range and high ga...

In grid connected applications the synchronization of output signals of the converters to be connected with grid parameters frequency and phase is of great importance. Different methods based on Fourier transforms, zero-crossing detection, Kalman filters, phase-locked loops (PLL) and others are used for this synchronization. This paper presents a new PLL for synchronization of the output curren...

Phase locked loop (PLL) is one of the most critical devices in modern electronic systems. PLLs are widely used as clock generator or frequency synthesis in communication systems, computers, radio and other electronic applications. Phase noise represents the phase variations of a PLL output signal and is the most important characteristic of PLLs because it reflects the stability of PLL systems. ...

Phase-locked-loop in radiofrequency and mixed signal integrated circuit experience noise as electromagnetic interference coupled on input and power supply which translates to the timing jitter. Most of PLL noise analysis did not take into account the ageing effect. However device ageing can degrade the physical parameters of transistors and makes noise impact worse. This paper deals with the an...

Purpose – The purpose of the paper is to introduce the Dynamic Phasor Modelling (DPM) approach for stability investigation and control design of single-phase Phase Locked Loops PLLs. The aim is to identify the system instabilities not predicted using the existent analysis and design methods based on the simplified average model approach. Design/methodology/approach – This paper starts by invest...

The dc component, which may be caused by different factors in the grid voltage, is one of disturbances that severely affect performance synchronization systems and, therefore, grid-tied power converters. In phase-locked loop (PLL) and frequency-locked (FLL)-based systems, this article focuses on, some solutions to deal with challenge have been proposed literature. One best available adding reje...

The paper proposes a way of implementing a phase locked loop (PLL) motor speed controller. The main emphasis is on the FPGA implementation of the digital PLL. The closed loop sensing element is an optical tachometer, which outputs an impulse train with a frequency proportional to the motor rotational speed. This impulse train will be synchronized by the PLL to a reference impulse train of a giv...

This paper applies digital PLL (Phase-locked loop) approach to the body movement classification problem. PLLs have been used efficiently in telecommunication to retrieve modulated signals from the background noise. Acceleration sensor signal processing often require the same kind of noise tolerance and the relevant movement patterns are frequently periodic, e.g. walking. The paper presents the ...

A scheme of frequency hopping spread spectrum (FHSS) frequency synthesizer suitable for synthesis of radio-frequency (RF) carrier signal in very high frequency (VHF) band is proposed, implemented and tested. The synthesizer is based on the direct digital frequency synthesis (DDFS or DDS) and phase locked loop (PLL) with dynamic monitoring of varicap’s voltage to reduce switching time. The resul...

Distributed beamforming between separate wireless nodes in a distributed antenna array requires significant coordination of the relative electrical states systems to achieve and maintain phase-coherent state. A principal factor impacting phase coherence is stability local oscillators on each node. Ensuring coherent state distribution reference frequency such that all are operating same basis fr...