Abstract
This chapter presents a comparative study of all-digital ΣΔM structures as part of the multi-standard frequency synthesizer [1]. As discussed previously, ΣΔ modulation is used to enable fractional frequency synthesis by modulating a sequence of division values with a desired fractional mean and providing the added advantage of noise shaping. It is also important to note that ΣΔMs used in the context of fractional-N frequency synthesis are entirely digital in contrast with the more familiar use of this type of modulation in analog to digital conversion. This chapter presents a discussion dealing with the classification, selection, simulation, and analysis of ΣΔMs and their contribution to phase noise at the modulator output.
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Atallah, J.G., Ismail, M. (2012). Choice of Sigma-Delta Modulation. In: Integrated Frequency Synthesis for Convergent Wireless Solutions. Analog Circuits and Signal Processing. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-1466-7_7
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DOI: https://doi.org/10.1007/978-1-4614-1466-7_7
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