Journal ArticleDOI
Delta-sigma modulation in fractional-N frequency synthesis
TLDR
In this article, a delta-sigma (Delta-Sigma) modulation and fractional-N frequency division technique for indirect digital frequency synthesis using a phase-locked loop (PLL) is described.Abstract:
A description is given of a delta-sigma ( Delta - Sigma ) modulation and fractional-N frequency division technique for performing indirect digital frequency synthesis using a phase-locked loop (PLL). The use of Delta - Sigma modulation concepts results in beneficial shaping of the phase noise (jitter) introduced by fractional-N division. The technique has the potential to provide low phase noise, fast settling time, and reduced impact of spurious frequencies when compared with existing fractional-N PLL techniques. >read more
Citations
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Journal ArticleDOI
A 27-mW CMOS fractional-N synthesizer using digital compensation for 2.5-Mb/s GFSK modulation
TL;DR: A digital compensation method and key circuits are presented that allow fractional-N synthesizers to be modulated at data rates greatly exceeding their bandwidth and indicate that it meets performance requirements of the digital enhanced cordless telecommunications (DECT) standard.
Journal ArticleDOI
A modeling approach for /spl Sigma/-/spl Delta/ fractional-N frequency synthesizers allowing straightforward noise analysis
TL;DR: In this paper, a general model of phase-locked loops (PLLs) is derived which incorporates the influence of divide value variations, and the model allows straightforward noise and dynamic analyses of /spl Sigma/-/spl Delta/ fractional-N frequency synthesizers.
Journal ArticleDOI
A fully integrated CMOS DCS-1800 frequency synthesizer
Jan Craninckx,Michiel Steyaert +1 more
TL;DR: In this paper, a prototype frequency synthesizer for the DCS-1800 system has been integrated in a standard 0.4 /spl mu/m CMOS process without any external components.
SP 23.5: A Fully Integrated CMOS DCS-1800 Frequency Synthesizer
J. Craninckx,M. Steyaert +1 more
TL;DR: In this article, a 4/sup th/order type-2 charge-pump PLL frequency synthesizer for the DCS-1800 system in a standard 0.4 /spl mu/m CMOS process without external components is presented.
Journal ArticleDOI
A wideband 2.4-GHz delta-sigma fractional-NPLL with 1-Mb/s in-loop modulation
TL;DR: In this paper, a phase noise cancellation technique and a charge pump linearization technique are presented and demonstrated as enabling components in a wideband CMOS delta-sigma fractional-N phase-locked loop (PLL).
References
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Journal ArticleDOI
A Use of Double Integration in Sigma Delta Modulation
TL;DR: A modulator that employs double integration and two-level quantization is easy to implement and is tolerant of parameter variation.
Patent
A frequency synthesiser
TL;DR: In this paper, a frequency synthesiser comprising a phase-locked loop having a reference oscillator coupled to a first input of a comparator, a voltage controlled oscillator (VCO) for providing an output signal, which output signal is fed back by way of a divider circuit, or dividing the output fequency by a factor N to a second input of said comparator.
Book ChapterDOI
The Structure of Quantization Noise from Sigma-Delta Modulation
James C. Candy,O. Benjamin +1 more
TL;DR: Simple algebraic expressions for this modulation noise and its spectrum in terms of the input amplitude are derived and can be useful for designing oversampled analog to digital converters that use sigma-delta modulation for the primary conversion.
Journal ArticleDOI
A Use of Limit Cycle Oscillations to Obtain Robust Analog-to-Digital Converters
TL;DR: High quality analog-to-digital conversions are obtained using simple and inexpensive circuits that require no high-precision components and has many of the desirable properties of classical feedback servomechanisms.
Journal ArticleDOI
Spectral analysis of quantization noise in a single-loop sigma-delta modulator with DC input
TL;DR: It is shown that the sample mean and power of the binary quantization noise are consistent with the common uniform distribution assumption, but that the autocorrelation and power spectrum are not consistent withThe white noise assumption.