基于连续时间sigmadelta调制器的超声成像系统

《基于连续时间sigmadelta调制器的超声成像系统》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、AbstractAbstractUltrasoundimagingplaysallimportantroleinmodemmedicalimagingbecauseofitscharacteristicsofnon—invasion，realtime，convenienceandSOon．Themodemmedicalultrasoundim画ngbasedonthelatesttheoryofmedicalultrasound，andcombinedwimcomputerinformationtechnolo

2、gyandanewtypeofpiezoelectricmaterial．Withtheexpandingofultrasoundimagingsystemsinrecentyears，themarketofportableultrasoundimagingsystemisincreasing．Aseachchanneloftheultrasoundimagingsystemneedstransmitterandreceivercircuit，thehardwaresystemwillbeverycomplic

3、atedfora128-channelultrasoundimagingsystem．Thegoalofportableultrasoundimagingsystemisreducingsystemandloweringpowerconsumptionbasedonthetraditionalultrasoundimagingsystem．Themainmethodsare：l、Reducethenumberofchannelsintheultrasoundimagingsystem；2、Usemoresmal

4、lersizeandlowerpowercircuitsorintegratedchips；3、Simplifythesystemstructure；Intheportableultrasoundimagingsystem，thefirsttwomethodsarecommonlyused．Althoughtheformeristhereducedsizeandpowerconsumption，thismeansreductiontoreceivedinformationwillultimatelyaffect

5、theimagequality．Thelatterhavebeenreducedinvaryingdegreesinsizeandpowerconsumption,usuallyusingtheAFE(analogfront-endreceivercircuit)，andthepulsegeneratorthatisintegrationoftheDAC，low-passfilterandamplifierofhigh—voltage(ultrasonictransmitter)．Thefollowingisi

6、nvolvedinthispaper：1、AnalysedtheSigma-DeltaModulator,anddiscussultrasoundimagingofcontinuous··timeSigma-·Deltamodulator；thendesignacontinuoustimeSigma—Deltamodulator．ADCtypicallyis10bit～12bitresolutioninultrasoundimagingsystems，SOtheSNRcailnotbelessthan62dB；

7、2、Proposedtheultrasoundimag咄systemusingcontinuous—timeSigma-DeltamodulatorbasedonultrasoundimagingsystemSigma-DeltaADC．3、Basedontheultrasoundimagingsystemusingcontinuous—timeSigma-Deltamodulator，modifiedthedelayandsumbeamformingalgorithm；ⅢAbstract4、Tocompare

8、dwithconventionalultrasoundimagingsystemsandima百ngresults，discussedtheadvantageofultrasoundimagingsystemusingcontinuous-timeSigma-Deltamodulatorindetail．Thispaperdiscussedtheworkandgavecorrespon