An 8-MHz bandwidth continuous-time ΔΣ modulator with DAC error sensitivity reduction for medical ultrasonic applications

Teng Chuan Cheng*, Tsung Heng Tsai

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

This paper proposed a new architecture to mitigate digital-to-analog converter (DAC) errors in a continuous-time ΔΣ modulator (CTSDM). The modulator adopted the 3rd-order loop filter with dual-loop architecture. Digital integrator feedback (DIF) technique is proposed to tolerate more clock jitter and DAC errors. Multi-bit quantizer and non-return-to-zero (NRZ) DAC are utilized to reduce clock jitter sensitivity. The proposed design effectively addresses the noise introduced by the multi-bit DAC with the assistance of a simple digital first-order digital filter. The presented CTSDM achieves 79dB SNR, and 82dB dynamic range. This design is implemented in a TSMC 0.18μm CMOS process. The power consumption is only 2.5mW. Low power and wide bandwidth make this ADC suitable for portable medical ultrasonic applications.

Original languageEnglish
Title of host publication2012 IEEE Biomedical Circuits and Systems Conference
Subtitle of host publicationIntelligent Biomedical Electronics and Systems for Better Life and Better Environment, BioCAS 2012 - Conference Publications
Pages340-343
Number of pages4
DOIs
StatePublished - 2012
Event2012 IEEE Biomedical Circuits and Systems Conference: Intelligent Biomedical Electronics and Systems for Better Life and Better Environment, BioCAS 2012 - Hsinchu, Taiwan
Duration: 28 Nov 201230 Nov 2012

Publication series

Name2012 IEEE Biomedical Circuits and Systems Conference: Intelligent Biomedical Electronics and Systems for Better Life and Better Environment, BioCAS 2012 - Conference Publications

Conference

Conference2012 IEEE Biomedical Circuits and Systems Conference: Intelligent Biomedical Electronics and Systems for Better Life and Better Environment, BioCAS 2012
Country/TerritoryTaiwan
CityHsinchu
Period28/11/1230/11/12

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