Browsing by Author "Izouggaghen, Badre"

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    Spur Model for a Fixed-Frequency Signal Subject to Periodic Jitter
    (IEEE, 2008) Salomon, Max-Elie; Izouggaghen, Badre; Khouas, Abdelhakim; Savaria, Yvon
    This paper presents an automated algorithm that is capable of predicting both the location and magnitude of spurs that are caused by different sources of jitter on a periodic signal. A practical circuit that produces this kind of jittered periodic signal is the direct digital period synthesis (DDPS) circuit that can be used as a flexible clock source for various applications such as adjusting a sampling rate in a measurement and signal processing. Points of interest with clocks that are subject to periodic perturbations are their spectral purity and jitter characteristics. Our algorithm is applied to the DDPS to greatly reduce the simulation time that is needed to accurately compute the spectrum of the signal and its spurious frequency content. The method is used to explore how the operating parameters of the DDPS influence the spectral purity of its output. The generic analysis method that has been used in this paper can be transposed to fractional- N synthesizers, delay-line-based direct digital synthesizers, or serializers
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    Spurs modeling in direct digital period synthesizers related to phase accumulator truncation
    (IEEE, 2005) Izouggaghen, Badre; Khouas, Abdelhakim; Savaria, Yvon
    This paper presents an analytic model of the spurious noise frequencies in Direct Digital Period Synthesizer (DDPS) due to phase accumulator truncation. DDPS is a new technique for frequency synthesis that takes advantage of the speed and low jitter of a delay-lockedloop- based frequency multipliers and the ability to digitally control the frequency from the direct digital synthesis technique DDS [1-2]. The most important source of spurious noise frequencies in a DDPS circuit is the truncation of the output of its phase accumulator. Computing spectral analysis of DDPS circuit is a CPU time consuming task. Based on series of analytic calculations, a general and simple mathematical formula of the location of spurious frequencies and their magnitudes is predicted. This formula will help designers analyze and develop new DDPS circuits faster