Conference paper
System level design of a continuous-time ΔΣ modulator for portable ultrasound scanners
Department of Electrical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark1
Analogic Ultrasound, BK Medical Design Center, Herlev, Denmark2
In this paper the system level design of a continuous-time ΔΣ 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 320MHz 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 ΔΣ modulator versus various block performance parameters is presented as trade-off curves.
Based on these results, the block specifications are derived.
Language: | English |
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Publisher: | IEEE |
Year: | 2015 |
Pages: | 1-4 |
Proceedings: | 2015 Nordic Circuits and Systems Conference (NORCAS): NORCHIP & International Symposium on System-on-Chip (SoC) |
ISBN: | 1467365750 , 1467365769 , 1467365777 , 9781467365758 , 9781467365765 and 9781467365772 |
Types: | Conference paper |
DOI: | 10.1109/NORCHIP.2015.7364408 |