Browsing by Author "Ashry, Ahmed"

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    Measurement of continuous-time ΣΔ modulators: Implications of using spectrum analyzer
    (IEEE, 2010) Ashry, Ahmed; K El-Shennawy, Ahmed; Elbadry, Mohammad; Elsayed, Ayman; Aboushady, Hassan
    In this paper, The difference between getting the output spectrum directly using spectrum analyzer and obtaining the spectrum digitally in measuring clock jitter effect on continuous-time ΣΔ modulator is analyzed. It is shown that clock jitter can be seen as input-referred or output-referred, depending on the nature of the measurement tool. Quantization noise and jitter noise are analyzed and compared graphically using a simple approach. The presented analysis is verified with system-level simulation of a 4 th order bandpass continuous-time ΣΔ modulator.