System Level Design of a Continuous-Time Delta-Sigma Modulator for Portable Ultrasound Scanners

Pere Llimos Muntal, Kjartan Færch, Ivan Harald Holger Jørgensen, Erik Bruun

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    In this paper the system level design of a continuous-time ∆Σ modulator for portable ultrasound scanners is presented. The overall required signal-to-noise ratio (SNR) is derived to be 42 dB and the sampling frequency used is 320 MHz for an oversampling ratio of 16. In order to match these requirements, a fourth order, 1-bit modulator with optimal zero placing is used. An analysis shows that the thermal noise from the resistors and operational transconductance amplifier is not a limiting factor due to the low required SNR, leading to an inherently very low-power implementation. Furthermore, based on high-level VerilogA simulations, the performance of the ∆Σ modulator versus various block performance parameters is presented as trade-off curves. Based on these results, the block specifications are derived.
    Original languageEnglish
    Title of host publicationProceedings of NORCAS 2015
    Number of pages4
    Publication date2015
    ISBN (Print)978-1-4673-6576-5
    Publication statusPublished - 2015
    Event2015 IEEE Nordic Circuits and Systems Conference - Oslo, Norway
    Duration: 26 Oct 201528 Oct 2015
    Conference number: 1


    Conference2015 IEEE Nordic Circuits and Systems Conference
    OtherA merge of NORCHIP and the International Symposium on System-on-Chip (SoC)
    Internet address


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