Yuav siv diodes hauv cov cuab yeej kho mob li cas los txo cov suab nrov hauv Circuit Court?

1, Qhov chaw thiab qhov cuam tshuam ntawm Kev Kho Mob Circuit Court suab nrov
Lub suab nrov ntawm cov cuab yeej kho mob feem ntau muab faib ua ob pawg:

High zaus electromagnetic cuam tshuam (EMI): tsim los ntawm kev hloov cov khoom siv hluav taws xob, kev sib txuas lus wireless, lossis cov khoom siv sab nraud, nrog ntau zaus ntawm 100kHz thiab 1GHz. Piv txwv li, yog tias ib qho electrocardiograph (ECG) tsis ua kom muaj zog siab - nrov nrov, nws yuav ua rau muaj kev cuam tshuam ntawm QRS complex thiab cuam tshuam rau kev kuaj mob ntawm arrhythmia.
Lub hwj chim ripple suab nrov: tshwm sim los ntawm tsis txaus rectification Circuit Court los yog capacitor filtering, manifested li tsawg- zaus hloov pauv (50Hz / 60Hz fais fab zaus cuam tshuam). Hauv cov khoom siv nqa tau xws li cov ntsuas ntshav qabzib, lub suab nrov ntawm lub zog tuaj yeem npog cov cim tsis muaj zog tam sim no, uas ua rau ntsuas qhov yuam kev ntau tshaj ± 10%.
Kev puas tsuaj ntawm lub suab nrov tsis txwv rau qhov teeb liab distortion, tab sis kuj tseem tuaj yeem ua rau cov khoom siv tsis ua haujlwm. Piv txwv li, hauv defibrillators, yog tias lub zog tsis muaj suab nrov, lub siab -voltage discharge module tuaj yeem ua rau lub voj voog puas tsuaj vim qhov tshwm sim tsis zoo, ua rau muaj kev phom sij rau tus neeg mob.

2, Cov txheej txheem tseem ceeb thiab kev xaiv cov qauv ntawm diode txo suab nrov
1. Nonlinear rectification yam ntxwv: suppress siab - suab nrov zaus
Lub diode nthuav tawm cov impedance siab thaum thim rov qab thiab ua haujlwm thaum mus rau pem hauv ntej, ua rau nws "ib- txoj kev valve" rau siab - nrov nrov. Thaum lub suab nrov dhau los ntawm lub diode, cov khoom siv rau pem hauv ntej yog absorbed los ntawm txoj kev conduction, thiab qhov rov qab tivthaiv yog thaiv los ntawm qhov siab impedance, yog li hloov AC suab nrov rau hauv DC tivthaiv thiab siv rau hauv Circuit Court. Piv txwv li, nyob rau hauv ECG pem hauv ntej-kawg Circuit Court, kev siv Schottky diodes (xws li BAT54S) tuaj yeem tiv thaiv siab -ntau zaus cuam tshuam los ntawm kav hlau txais xov txuas, thiab txhim kho lub teeb liab- rau- suab nrov piv (SNR) li ntawm 15dB.

Cov ntsiab lus tseem ceeb rau kev xaiv:

Rov qab Lub Sijhawm Rov Qab (TRR): Nws yuav tsum tsawg dua 1/10 ntawm lub suab nrov zaus. Piv txwv li, rau 1MHz suab nrov, TRR yuav tsum tsawg dua los yog sib npaug rau 100ns, thiab nws raug pom zoo kom siv ultrafast rov qab diodes (xws li UF4007, TRR=50ns).
Junction capacitance (Cj): Tsawg junction capacitance tuaj yeem txo qhov siab -frequency signal coupling. Ntawm lub tswv yim ntawm bioelectric amplifier, diodes nrog Cj<2pF (such as the HSMS-286x series) should be selected to avoid signal attenuation.
2. Zener diode: clamp fais fab mov ripple
Zener diodes tswj kev ruaj ntseg hluav taws xob los ntawm lawv cov yam ntxwv thim rov qab, zoo clamping fais fab mov ripple. Piv txwv li, nyob rau hauv qhov qis -voltage fais fab mov (5V) ntawm portable ultrasound khoom, siv 1N4733A (nrog ib tug voltage tswj tus nqi ntawm 5.1V) yuav suppress lub ripple voltage ntawm ± 200mV mus rau hauv ± 50mV, ua tau raws li ADC sampling raug cov cai.

Cov ntsiab lus tseem ceeb rau kev xaiv:

Dynamic resistance (Zz): qhia txog qhov tseeb ntawm kev tswj hluav taws xob. Qhov me Zz, qhov zoo dua qhov ripple suppression nyhuv. Nws raug nquahu kom xaiv cov qauv nrog Zz<10 Ω for medical grade equipment (such as BZT52C5V1).
Kub coefficient (TC): Cov cuab yeej kho mob yuav tsum tau ua haujlwm nyob rau hauv ib puag ncig ntawm -20℃txog 60 degree, thiab lub tshuab hluav taws xob nrog TC<2mV/℃ should be selected to avoid temperature drift affecting performance.
3. Ncua diode: siab siab -ntau zaus nqus suab nrov
Nrawm diodes (xws li 1N5711) tsim qis capacitance PN junctions los ntawm cov txheej txheem tshwj xeeb doping, uas tuaj yeem nqus cov suab nrov GHz. Hauv RF pem hauv ntej- kawg ntawm cov khoom siv sib nqus resonance imaging (MRI), siv 1N5711 tuaj yeem ua kom lub suab nrov ntawm 100MHz mus rau 1GHz los ntawm ntau dua 40dB, tiv thaiv qhov qis - suab nrov amplifier (LNA) los ntawm kev cuam tshuam.

Cov ntsiab lus tseem ceeb rau kev xaiv:

Reverse leakage tam sim no (Ir):<1 μ A (25 ℃) is required to avoid introducing additional noise in low-power circuits.
Rated zog (Pd): Nws yuav tsum raug xaiv raws li lub suab nrov. Piv txwv li, hauv MRI cov cuab yeej, cov qauv nrog Pd Ntau dua lossis sib npaug ntawm 1W yuav tsum raug xaiv kom tiv taus siab - zog pulse cuam tshuam.
3, Kev xyaum txo suab nrov hauv cov ntawv thov kev kho mob raug xwm txheej
1. ECG teeb liab tau txais: pem hauv ntej-kawg tiv thaiv hluav taws xob
Lub amplitude ntawm ECG teeb liab tsuas yog 1mV rau 5mV, uas yog yooj yim npog los ntawm siab - suab nrov zaus. Thaum tsim, lub bidirectional suppression diode (xws li BAV99) yuav tsum tau txuas nrog nyob rau hauv parallel ntawm lub tswv yim kawg los tsim ib tug ± 10V clamp tiv thaiv, thiab ib tug 0.1 μ F capacitor yuav tsum tau txuas nyob rau hauv series los lim tawm siab - zaus cuam tshuam. Cov kev ntsuam xyuas tau pom tias cov tswv yim no tuaj yeem cuam tshuam 50Hz lub zog zaus cuam tshuam los ntawm 60dB thiab txhim kho qhov tseeb ntawm QRS txoj kev tshawb pom rau 99.5%.

2. Portable ntshav qabzib ntsuas: fais fab mov suab nrov
Lub ntsuas ntshav qabzib yog siv los ntawm ib lub roj teeb lithium, thiab lub zog ripple tuaj yeem cuam tshuam rau kev tshawb pom ntawm enzyme electrode tam sim no. Los ntawm paralleling Schottky diodes (xws li SS14F) ntawm lub tswv yim ntawm LDO regulator, ripple voltage yuav raug txo los ntawm ± 50mV rau ± 10mV, thiab kev ntsuas repeatability (CV%) tuaj yeem ua kom zoo ntawm 8% mus rau hauv 3%.

3. Endoscopic imaging system: RF cuam tshuam kev sib cais
Lub koob yees duab module ntawm wireless endoscope yog raug rau 2.4GHz Wi Fi teeb liab cuam tshuam, ua rau muaj suab nrov kab rov tav hauv daim duab. Los ntawm kev sib txuas cov hluav taws xob hluav taws xob (xws li HSMS-2850) hauv cov kab nruab nrab ntawm lub kav hlau txais xov thiab RF pem hauv ntej- kawg, cov teeb liab cuam tshuam tuaj yeem raug txo qis los ntawm 30dB, thiab cov teeb liab duab -to-noise ratio (PSNR) tuaj yeem txhim kho los ntawm 12dB, ntsib cov kev xav tau.