Frequency and Phase Difference Control Using Fractional-$N$ PLL Synthesizers by Composition of Control Data

Tajima, Kazuo; Hayashi, Ryoji; Isota, Yoji

doi:10.1109/tmtt.2007.909149

Cited by 14 publications

(4 citation statements)

References 13 publications

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“…Now, these frequency dividers (FDs) are worked out and written into the FD registers. According to [33], the frequency and phase shift control can be mathematically described by (4) and (5).…”

Section: A Principlementioning

confidence: 99%

Ultra-wideband generator of coherent multicarriers for multipactor sensor system

2020

IEICE Electron. Express

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Multicarrier signals are used in many radio frequency and microwave systems. A typical example is the wideband communication satellites. However, it is rare to require the carriers in such multicarrier systems to be coherent due to the fact that their frequencies are different. An exception is the testing system for Multipactor Sensor System(MSS). Compared with existing methods that rely on the heavy use of expensive microwave instruments, in this work, we demonstrate an ultra-wideband coherent multicarrier generator (UCMG) with commercial chips and economic devices, which works from UHF to Ku band. MSS experimental results verified the novelty and effectiveness of the proposed approach. The implemented UCMG would make it affordable for a regular microwave laboratory to conduct quantitative experimental researches on wideband multicarrier multipactors. It can also be widely used in other RF systems such as massive MIMO and large-scale phase array systems.

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Section: A Principlementioning

confidence: 99%

Ultra-wideband generator of coherent multicarriers for multipactor sensor system

2020

IEICE Electron. Express

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“…(2) Equation (2) reveals a trade-off between the output fre quency of the PLL and the time step; as the output frequency increases the time step decreases and requires a more precise and higher-certainty measurement. In par ticular, any experimental setup must be able to measure a time step equal to or less than (3) in order to approach the theoretical limit in (I). At microwave frequencies, the time step in (3) is difficult to measure and therefore requires the VCO output to be postdivided to RF frequencies during experimentation.…”

Section: Simulation and Experimental Setupmentioning

confidence: 99%

“…Recent work performed by Tajima et at. in [3] demon strated a fractional-N PLL phase shifter through cyclic shift and composition of control data of frequency dividers. Their work resulted in a system whose measured phase difference error was no greater than ±2° within the L band.…”

Section: Introductionmentioning

confidence: 99%

Microdegree frequency and phase difference control using fractional-N PLL synthesizers

Gray

Masood

Galloway

et al. 2012

2012 IEEE/MTT-S International Microwave Symposium Digest

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“…Fractional-N synthesisers can simultaneously achieve fast tuning speed and fine frequency resolution [1][2][3]. The advent of sigma-delta (Σ-Δ) modulation has given the potential for lower close-in phase noise floor in these synthesisers [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Phase compensation of intermodulation‐induced spurs in fractional‐ N frequency synthesisers

Wang

2013

IET Microwaves, Antennas & Propagation

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Intermodulation effect occurs when the nonlinearity of a device or system with multiple frequencies causes undesired outputs at other frequencies. Intermodulation effect may cause high amplitude spurs on some dedicated channels in addition to the spurs introduced by nonlinear distortion in the modulator of fractional‐N synthesisers, which severely degrade the signal‐to‐noise ratio. In this study, a phase compensation technique is proposed to suppress at least part of these fractional spurs – in particular the most dominant sidebands. A small amount of controlled amplitude and phase voltage controlled oscillator (VCO) signal is coupled onto the phase/frequency detector input to cancel‐out the potential intermodulation‐induced spurious component. A prototype of fractional‐N frequency synthesiser based on the proposed technique has been developed. The synthesiser has measured −113 dBc/Hz in‐band phase noise benefiting from the high speed sigma–delta noise shaper. A modest degrees of VCO to phase detector cross‐coupling suppressed the spurious components by 18 dB. A variety of measured results are shown to demonstrate a substantial improvement in spectra purity.

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Frequency and Phase Difference Control Using Fractional-$N$ PLL Synthesizers by Composition of Control Data

Cited by 14 publications

References 13 publications

Ultra-wideband generator of coherent multicarriers for multipactor sensor system

Ultra-wideband generator of coherent multicarriers for multipactor sensor system

Microdegree frequency and phase difference control using fractional-N PLL synthesizers

Phase compensation of intermodulation‐induced spurs in fractional‐ N frequency synthesisers

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