A 10 MHz Bandwidth Continuous-Time Delta-Sigma Modulator for Portable Ultrasound Scanners

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Abstract

A fourth-order 1-bit continuous-time delta-sigma modulator designed in a 65 nm process for portable ultrasound
scanners is presented in this paper. The loop filter consists of RCintegrators, with programmable capacitor arrays and resistors, and the quantizer is implemented with a high-speed clocked comparator and a pull-down clocked latch. The feedback signal is generated with voltage DACs based on transmission gates. Using this implementation, a small and low-power solution required for portable ultrasound scanner applications is achieved. The modulator has a bandwidth of 10 MHz with an oversampling ratio of 16 leading to an operating frequency of 320 MHz. The design occupies an area of 0.0175 mm2 and achieves a SNR of 45 dB consuming 489 µA at a supply voltage of 1.2 V; the resulting FoM is 197 fJ/conversion. The results are based on simulations with extracted parasitics including process and mismatch variations.
Original languageEnglish
Title of host publicationProceedings of 2016 IEEE NORCAS Nordic Circuits and Systems Conference - NORCAS 2016
Number of pages5
PublisherIEEE
Publication date2016
ISBN (Print)978-1-5090-1095-0
DOIs
Publication statusPublished - 2016
Event2016 IEEE NorCAS Conference - Copenhagen, Denmark
Duration: 1 Nov 20162 Nov 2016

Conference

Conference2016 IEEE NorCAS Conference
CountryDenmark
CityCopenhagen
Period01/11/201602/11/2016

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