Simulated ECG Teeb Meem Tau Txais LTSpice: 7 Kauj Ruam

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:24

Lub peev xwm ntawm lub plawv tso kua mis yog lub luag haujlwm ntawm cov cim hluav taws xob. Cov kws kho mob tuaj yeem nyeem cov cim no ntawm ECG txhawm rau txheeb xyuas ntau yam teeb meem plawv. Ua ntej lub teeb liab tuaj yeem npaj tau zoo los ntawm kws kho mob, txawm li cas los xij, nws yuav tsum raug lim kom zoo thiab nthuav dav. Hauv phau ntawv qhia no, kuv yuav taug kev koj li cas los tsim lub Circuit Court cais ECG cov cim los ntawm kev ua txhaum txoj cai no tau tawg mus rau hauv peb yam yooj yim: ib qho cuab yeej siv suab nrov, lub tshuab ua kom dhau lub lim, thiab lub hauv paus lim, nrog kev txiav tawm zaus thiab nce tau txiav txim los ntawm cov ntawv luam tawm thiab cov qauv tam sim no.

Khoom siv:

Nov yog phau ntawv qhia txhais rau LTSpice simulation, yog li cov khoom siv nkaus xwb koj yuav xav tau tus qauv kev sib txuas yog LTSpice daim ntawv thov. Yog tias koj xav sim koj lub Circuit nrog daim ntawv ECG wav, Kuv pom kuv li ntawm no.

Kauj Ruam 1: Tsim Lub Band-pass Lim

Raug ECG cov cim qhia muaj ntau zaus ntawm 0.5-250 Hz. Yog tias koj xav paub txog qhov kev xav tom qab qhov no, xav nyeem kom nyeem ntxiv ntawm no ntawm no lossis ntawm no. Txog lub hom phiaj ntawm phau ntawv qhia no, qhov no txhais li cas yog tias peb xav lim tawm txhua yam tsis nyob hauv cheeb tsam ntawd. Peb tuaj yeem ua qhov no nrog cov qhab-hla lim. Raws li cov ntawv hloov pauv hauv kab lus tshaj tawm, band-pass lim lim ntawm thaj tsam ntawm 1/(2*pi*R1*C1) thiab 1/(2*pi*R2*C2). Lawv kuj ua kom lub teeb liab los ntawm (R2/R1).

Cov txiaj ntsig tau raug xaiv kom cov zaus txiav tawm qhov txiaj ntsig yuav haum rau qhov xav tau ntawm ECG teeb liab thiab qhov nce yuav sib npaug li 100. Cov txheej txheem nrog cov txiaj ntsig no tau hloov pauv hauv qhov tuaj yeem pom hauv cov duab txuas nrog.

Kauj Ruam 2: Tsim Tus Qauv Ntsis Lim

Tam sim no uas peb tau lim tawm txhua yam tsis nyob hauv ECG lub teeb liab ntau zaus, nws lub sijhawm los lim tawm cov suab nrov tsis zoo hauv nws qhov ntau. Lub suab nrov-lub zog yog ib qho ntawm ECG feem ntau cuam tshuam thiab muaj zaus ntawm ~ 50 Hz. Txij li qhov no yog nyob hauv thaj tsam band-pass, nws tuaj yeem raug tshem tawm nrog lub ntsej muag lim. Lub taub lim dej ua haujlwm los ntawm kev tshem tawm qhov nruab nrab zaus nrog tus nqi 1/(4*pi*R*C) raws li cov txheej txheem txuas nrog.

Tus tiv thaiv thiab tus nqi hluav taws xob tau xaiv los lim tawm 50 Hz suab nrov, thiab lawv qhov txiaj ntsig tau txuas rau hauv cov phiaj xwm txuas. Nco tseg tias qhov no tsis yog kev sib xyaw ua ke ntawm RC cov khoom uas yuav ua haujlwm; nws tsuas yog qhov kuv xaiv. Xav tias dawb los laij thiab xaiv qhov sib txawv!

Kauj Ruam 3: Tsim Kev Ntsuas Kev Ntsuas

Lub teeb liab ECG tseem yuav xav tau ua kom nrov dua. Txawm hais tias thaum peb tsim cov phiaj xwm, peb yuav tso lub suab nrov ua ntej, nws yooj yim dua lub tswv yim los xav txog tom qab lim dej. Qhov no yog vim tias qhov kev sib tw tag nrho cov txiaj ntsig tau txiav txim siab los ntawm cov qhab-hla kev nthuav dav (Saib Kauj Ruam 1 rau kev kho dua tshiab).

Feem ntau ECGs tau txais tsawg kawg 100 dB. Lub voj voog dB nce yog sib npaug rau 20*cav | Vout / Vin |. Ib qho Vout/Vin tuaj yeem daws tau raws li cov khoom tiv thaiv los ntawm kev tsom xam. Rau peb qhov kev sib tham, qhov no ua rau pom qhov txiaj ntsig tshiab:

dB Gain = 20*log | (R2/R1)*(1+2*R/RG) |

R1 thiab R2 yog los ntawm lim-lim lim (Kauj Ruam 1), thiab R thiab RG yog cov khoom siv los ntawm lub tshuab hluav taws xob no (saib cov duab txuas nrog). Kev daws rau qhov nce dB ntawm 100 tawm R/RG = 500. Qhov tseem ceeb ntawm R = 50k ohms thiab RG = 100 ohms tau xaiv.

Kauj Ruam 4: Kuaj Cov Cheeb Tsam

Txhua lub Cheebtsam tau cais cais kuaj nrog LTSpice's AC Sweep octave tsom xam cov cuab yeej. Parameters ntawm 100 ntsiab lus ib octave, 0.01 Hz pib zaus, thiab 100k Hz xaus zaus tau raug xaiv. Kuv siv qhov ntsuas qhov hluav taws xob qhov dav ntawm 1V, tab sis koj tuaj yeem sib txawv qhov dav. Qhov tseem ceeb nyob tos los ntawm AC cheb yog cov duab ntawm cov khoom sib xws rau kev hloov pauv hauv zaus.

Cov kev ntsuas no yuav tsum ua kom pom cov duab zoo ib yam nrog cov ntawv txuas hauv Kauj Ruam 1-3. Yog tias lawv ua tsis tau, sim rov suav koj cov resistor lossis tus nqi hluav taws xob. Nws kuj tseem tuaj yeem ua rau koj txoj kab hluav taws xob vim tias koj tsis muab hluav taws xob txaus kom muaj zog rau op amps. Yog tias koj tus lej R thiab C raug, sim ua kom muaj qhov hluav taws xob ntau ntxiv uas koj muab rau koj cov op amp (s).

Kauj Ruam 5: Muab Nws Txhua Qhov Ua Ke

Tam sim no, koj tau npaj txhij tso tag nrho cov khoom ua ke. Feem ntau, kev ua kom nrov nrov tau ua ua ntej pom, yog li qhov ntsuas qhov ntsuas tau muab tso ua ntej. Cov qhab-hla lim txuas ntxiv ua kom lub teeb liab ntau dua, yog li nws tau muab tso rau thib ob, ua ntej lub lim dej lim, uas yog lim dej huv. Tag nrho cov Circuit Court tau ua los ntawm AC Sweep simulation ib yam nkaus, uas tsim cov kev cia siab nrog kev nthuav dav ntawm 0.5 - 250 Hz, tshwj tsis yog 50 Hz thais ntau.

Kauj Ruam 6: Kev tawm tswv yim thiab ntsuas ECG Cov Cim

Koj tuaj yeem hloov koj qhov hluav taws xob los muab lub Circuit Court nrog lub teeb liab ECG tsis yog AC Sweep. Txhawm rau ua qhov no, koj yuav tsum rub tawm qhov koj xav tau ECG teeb liab. Kuv pom lub suab nrov-txhim kho.wav cov ntaub ntawv ntawm no thiab huv huv.txt ECG teeb liab ntawm no. tab sis koj tuaj yeem tuaj yeem nrhiav cov uas zoo dua. Cov ntaub ntawv nyoos thiab tso tawm rau.wav cov ntaub ntawv tuaj yeem pom txuas nrog. Nws nyuaj hais tias puas yog lossis tsis yog lub suab nrov nrov ua kom lub teeb liab ECG yuav tsim cov txiaj ntsig zoo dua. Nyob ntawm lub teeb liab, koj yuav xav tau kho me ntsis koj cov lim lim dej. Qhov pom-dhau cov teeb liab tso tawm kuj tseem tuaj yeem pom.

Txhawm rau hloov cov tswv yim, xaiv koj qhov hluav taws xob qhov hluav taws xob, xaiv qhov teeb tsa rau PWL Cov Ntaub Ntawv, thiab xaiv koj cov ntaub ntawv xav tau. Cov ntaub ntawv kuv siv yog.wav cov ntaub ntawv, yog li kuv kuj xav hloov LTSpice cov lus qhia ncaj qha los ntawm "PWL File =" rau "wavefile =". Rau cov ntaub ntawv.txt cov ntaub ntawv, koj yuav tsum khaws cov ntawv PWL ib yam.

Sib piv cov txiaj ntsig mus rau qhov zoo tshaj ECG teeb liab qhia tau tias tseem muaj qee qhov chaw rau kev txhim kho nrog tivthaiv-tweaking. Txawm li cas los xij, muab cov duab thiab suab nrov-ua kom zoo ntawm cov ntaub ntawv los ntawm qhov chaw, qhov tseeb tias peb tuaj yeem rho tawm P-yoj, QRS, thiab T-yoj yog thawj kauj ruam zoo. Cov ntaub ntawv ECG huv yuav tsum muaj peev xwm hla dhau lub lim dej zoo kawg nkaus.

Nco ntsoov ceev faj koj txhais li cas cov txiaj ntsig ECG cov txiaj ntsig teeb liab. Yog tias koj tsuas yog siv cov ntaub ntawv huv. Txt, tsis txhais tau tias koj lub kaw lus ua haujlwm kom lim lub teeb liab kom raug - nws tsuas yog txhais tau tias cov khoom tseem ceeb ntawm ECG tsis raug lim tawm. Ntawm qhov tod tes, tsis paub ntau ntxiv txog cov ntaub ntawv.wav, nws nyuaj rau txoj hauv kev los yog tsis hloov pauv yoj thiab cov duab sib txawv vim yog cov ntaub ntawv los lossis yog tias muaj teeb meem hauv kev lim tawm cov cim tsis xav tau.