In this paper, we propose a speedup method of frequency switching time in the phase locked loop (PLL) frequency synthesizer using the target frequency detector (TFD). The TFD detects the time Ta for any channels where the output of the PLL frequency synthesizer reaches the target frequency for the first time. At Ta, the programmable divider, the reference divider and the phase comparator are re...

This work presents a 24 ?GHz integrated Phase-Locked Loop in 60 sliding-IF transceiver for IEEE 802.15.3c standard with low phase noise. For noise, varactor and MOM cap combination method is applied this PLL. The capacitor bank optimized to decrease the noise folding from circuit within method. analog PLL fabricated 65 ?nm CMOS technology of ?98.8 dBc/[email protected] ?MHz, reference spur ?62....

Phase noise (PN) in phase locked loop (PLL) system is an important parameter in communication system. It degrades the system performance by increasing bit error rate (BER). The PLL concept was first appeared in the papers by Appleton in 1923 and de Bellescize in 1932 [1]. It is essentially a control system which employs feedback mechanism to synchronize the phase of output signal with the phase...

In this paper, an adaptive sliding mode observer (ASMO) associated with a phase locked loop (PLL) is assessed for the sensor-less control of rotor-tied doubly-fed induction generator (RDFIG). proposed PLL-ASMO estimator, ASMO utilizes stator current, voltage, and back electromotive force (EMF) as state variables. The used in order to estimate back-EMF from which slip position/speed extracted us...

In this paper, a new strategy of switchable CMOS phase-locked loop frequency synthesizer is proposed to increase its tuning range. The switchable PLL which integrates two phase-locked loops with different tuning frequencies are designed and fabricated in 0.5 μm n-well CMOS process. Cadence/Spectre simulations show that the frequency range of the switchable phased-locked loop is between 320 MHz ...

We present an analytical frequency-domain phase noise model for fractional-N phase-locked loops (PLL). The model includes the noise of the crystal reference, the reference input buffer, the voltage-controlled oscillator (VCO), the loop filter, charge pump device noise, sigma-delta modulator (SDM) noise including its effect on the in-band phase noise. Thermal device noise of the charge pump and ...

This work presents a method for modeling and simulating a second-order analog phase-locked loops (PLL) in time domain for studying its acquisition behavior. The proposed method uses phase error process for analyzing the PLL characteristics. The method enables to study the lockin and pull-in phenomena of analog PLL and the effects of changing phase offset and voltage offset values on acquisition...

Precision microwave measurement systems require highly stable oscillators with both excellent long-term and short-term stability. Compared to components used in laboratory instruments, dielectric resonator (DRO) offer low phase noise greatly reduced mechanical complexity. To further enhance performance, phase-locked loop (PLL) stabilization can be eliminate drift provide precise frequency contr...

In the transient process of grid-connected converter (GCC), existing research mainly focuses on impact control loops. Little attention is paid to stability issues driven by imbalance between input power and output GCC. This paper shows that will still exist even if ignoring dynamics phase-locked loop (PLL) current loop. this paper, models AC grid GCC are built under assumption PLL ignored. Then...