A 36-mW 320-MHz CMOS continuous-time sigma-delta modulator with 10-MHz bandwidth and 12-bit resolution

Kuo Che Hong*, Her-Ming Chiueh

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

A wide-bandwidth low-power CT ∑△ modulator with 10MHz signal bandwidth is implemented in TSMC 0.18 μm CMOS process in this paper. To realize such application scenario, the proposed modulator comprises a third-order active-RC loop filter and a 4-bit internal quantizer operating at 320 MHz clock frequency. To reduced clock jitter sensitivity, non-return-to-zero (NRZ) DAC pulse shaping is used. The excess loop delay is set to half the sampling period of the quantizer and the excess loop delay compensation is achieved by the discrete-time derivator structure. The simulation result achieves above 74-dB SNDR (12 ENOB) over a 10-MHz signal band. The power dissipation is 36mW from a 1.8-V supply and the energy per conversion is 235fJ from post-layout simulation. The proposed circuitry can be utilized in low-power medical imaging and modern wireless communications.

Original languageEnglish
Title of host publication2010 IEEE International 53rd Midwest Symposium on Circuits and Systems, MWSCAS 2010
Pages725-728
Number of pages4
DOIs
StatePublished - 20 Sep 2010
Event53rd IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2010 - Seattle, WA, United States
Duration: 1 Aug 20104 Aug 2010

Publication series

NameMidwest Symposium on Circuits and Systems
ISSN (Print)1548-3746

Conference

Conference53rd IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2010
CountryUnited States
CitySeattle, WA
Period1/08/104/08/10

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    Hong, K. C., & Chiueh, H-M. (2010). A 36-mW 320-MHz CMOS continuous-time sigma-delta modulator with 10-MHz bandwidth and 12-bit resolution. In 2010 IEEE International 53rd Midwest Symposium on Circuits and Systems, MWSCAS 2010 (pp. 725-728). [5548717] (Midwest Symposium on Circuits and Systems). https://doi.org/10.1109/MWSCAS.2010.5548717