Cov txheej txheem:
- Kauj Ruam 1: Kev Ntsuas Hluav Taws Xob
- Kauj Ruam 2: Active Notch Filter
- Kauj Ruam 3: Passive Bandpass Lim
- Kauj Ruam 4: Muab Cov Khoom Siv Hluav Taws Xob
Video: Automated ECG Circuit Model: 4 Kauj Ruam
2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:24
Lub hom phiaj ntawm txoj haujlwm no yog txhawm rau tsim cov qauv hluav taws xob nrog ntau yam khoom siv uas tuaj yeem ua kom muaj zog txaus thiab lim cov teeb liab ECG tuaj. Peb lub Cheebtsam yuav raug ua qauv ib tus zuj zus: ib qho cuab yeej siv suab nrov, lub ntsej muag ua haujlwm lim, thiab lim dej passive bandpass. Lawv yuav koom ua ke los tsim qhov qauv kawg ntawm ECG Circuit Court. Txhua qhov kev sib tw ua qauv thiab ntsuas tau ua hauv LTspice, tab sis lwm qhov kev sim sim hauv Circuit Court kuj tseem yuav ua haujlwm.
Kauj Ruam 1: Kev Ntsuas Hluav Taws Xob
Qhov no yuav yog thawj feem ntawm tag nrho ECG tus qauv. Nws lub hom phiaj yog ua kom nrov dua ECG cov teeb liab tuaj, uas yuav pib muaj qhov hluav taws xob qis heev. Kuv tau xaiv los siv ua ke op-amps thiab cov khoom tiv taus hauv ib txoj hauv kev uas yuav ua rau kom tau txais txiaj ntsig ntawm 1000. Thawj daim duab qhia pom cov cuab yeej siv suab nrov tsim qauv hauv LTspice. Daim duab thib ob qhia txog qhov sib npaug thiab ua cov lej. Thaum ua tiav tus qauv, kev tshuaj xyuas ib ntus ntawm cov teeb liab sinusoidal ntawm 1 mV ntawm 75 Hz tau ua tiav hauv LTspice kom paub meej tias qhov nce ntawm 1000. Daim duab thib peb qhia qhov txiaj ntsig ntawm qhov kev tshuaj xyuas no.
Kauj Ruam 2: Active Notch Filter
Qhov no yuav yog ntu thib ob ntawm tag nrho ECG tus qauv. Nws lub hom phiaj yog kom txo qis cov cim nrog zaus ntawm 60 Hz, uas yog qhov zaus ntawm AC kab hluav taws xob cuam tshuam. Qhov no cuam tshuam ECG cov cim, thiab feem ntau muaj nyob hauv txhua qhov chaw kho mob. Kuv tau xaiv los siv ua ke op-amp nrog cov khoom tiv taus thiab muaj peev xwm ua tau hauv ntxaib-T thais lim teeb tsa. Thawj daim duab qhia pom lub ntsej muag lim dej tsim qauv hauv LTspice. Daim duab thib ob qhia txog qhov sib npaug uas cuam tshuam thiab ua cov lej. Thaum ua tiav tus qauv, AC cheb ntawm qhov sinusoidal input teeb liab ntawm 1 V tau ua los ntawm 1 Hz - 100 kHz hauv LTspice kom paub meej qhov thais ntawm 60 Hz. Daim duab thib peb qhia pom cov txiaj ntsig ntawm qhov kev tshuaj xyuas no. Qhov sib txawv me ntsis hauv cov txiaj ntsig simulation piv rau cov txiaj ntsig xav tau yuav tshwm sim los ntawm kev ua kom tiav thaum xam cov khoom tiv thaiv thiab muaj peev xwm ntawm cov khoom siv hluav taws xob no.
Kauj Ruam 3: Passive Bandpass Lim
Qhov no yuav yog ib feem peb ntawm tag nrho ECG tus qauv. Nws lub hom phiaj yog lim tawm cov cim qhia uas tsis nyob hauv thaj tsam 0.05 Hz - 250 Hz, vim qhov no yog qhov ntau ntawm cov neeg laus ECG. Kuv tau xaiv los siv ua ke tiv thaiv cov khoom tiv taus thiab cov khoom muaj peev xwm yog li qhov kev txiav siab dhau yuav yog 0.05 Hz thiab qhov txiav qis dhau yuav yog 250 Hz. Thawj daim duab qhia pom passive bandpass lim lim tsim qauv hauv LTspice. Daim duab thib ob qhia txog qhov sib npaug uas cuam tshuam thiab ua cov lej. Thaum ua tiav tus qauv, AC cheb ntawm cov teeb liab sinusoidal ntawm 1 V tau ua los ntawm 0.01 Hz - 100 kHz hauv LTspice kom paub meej tias qhov siab thiab qis dua txiav tawm zaus. Daim duab thib peb qhia pom cov txiaj ntsig ntawm qhov kev tshuaj xyuas no. Qhov sib txawv me ntsis hauv cov txiaj ntsig simulation piv rau cov txiaj ntsig xav tau yuav tshwm sim los ntawm kev ua kom tiav thaum xam cov khoom tiv thaiv thiab muaj peev xwm ntawm cov khoom siv hluav taws xob no.
Kauj Ruam 4: Muab Cov Khoom Siv Hluav Taws Xob
Tam sim no tias txhua lub Cheebtsam tau tsim thiab ntsuas ib tus zuj zus, lawv tuaj yeem sib xyaw ua ke raws li lawv tau tsim. Qhov no ua rau tag nrho ECG cov qauv hluav taws xob uas xub muaj cov cuab yeej siv los ua kom lub teeb liab 1000x. Tom qab ntawd, lub ntsej muag lim tau siv los tshem tawm 60 Hz AC kab hluav taws xob suab nrov. Thaum kawg, lub bandpass lim tsis pub lub teeb liab hla uas yog sab nraum qhov ntau ntawm cov neeg laus ECG (0.05 Hz - 250 Hz). Ib zaug ua ke, raws li tau qhia hauv thawj daim duab, kev tshuaj xyuas ib ntus thiab tag nrho AC cheb tuaj yeem ua hauv LTspice nrog qhov ntsuas hluav taws xob ntawm 1 mV (sinusoidal) kom ntseeg tau tias cov khoom sib koom ua ke raws li tau npaj tseg. Cov duab thib ob qhia txog kev ntsuas ntsuas ib ntus, uas qhia teeb liab ntawm 1 mV txog ~ 0.85 V. Qhov no txhais tau tias yog qhov thais lossis bandpass lim cov khoom siv me ntsis ua rau lub teeb liab poob qis tom qab nws tau pib ua haujlwm 1000x los ntawm cov cuab yeej siv suab nrov. Daim duab thib peb qhia txog AC cheb cov txiaj ntsig. Cov phiaj xwm Bode no qhia pom qhov siab thiab qis dhau qhov kev txiav uas phim cov bandpass lim lub Bode zaj lus thaum kuaj tus kheej. Kuj tseem muaj qhov qis me ntsis nyob ib ncig ntawm 60 Hz, uas yog qhov chaw lim dej ua haujlwm kom tshem tawm cov suab tsis xav tau.
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