Oscilloscope teb system thiab cov yam ntxwv, yuav ua li cas xaiv cov khoom
Cov yam ntxwv teb ntawm oscilloscope yuav cuam tshuam rau lub waveform ntawm lub teeb liab thiab hloov kev suav ntawm lub teeb liab nce lub sij hawm. Thaum Pentium 4 nkag mus rau lub sijhawm gigahertz, kev sib txuas ceev ceev lossis tsheb npav xws li Serial ATA thiab PCI Express kuj maj mam dhau Gbps. Xaiv qhov kev sojntsuam tsim nyog yog qhov tseem ceeb, tab sis xaiv qhov tsim nyog oscilloscope kuj tseem ceeb.
Qhov ntsuas waveform yog kuaj thiab teeb liab ua tiav los ntawm cov khoom siv nkag los tso tawm kom pom ntawm lub vijtsam thaum cov ntaub ntawv tau txais kev cawmdim. Thaum xaiv qhov tsis tsim nyog oscilloscope, lub waveform tuaj yeem hloov pauv. Tshwj xeeb tshaj yog thaum ntsuas waveforms ntawm high-speed serial interfaces xws li PCI Express, nws tsis yog tsuas yog tsim nyog los ntsuas cov zaus zaus thiab bandwidth, tab sis kuj yuav tsum to taub cov lus teb yam ntxwv ntawm oscilloscope. Piv txwv li, thaum ntsuas qhov kev hloov ntawm cov teeb liab siab heev, yuav muaj qhov sib txawv vim qhov sib txawv ntawm cov lus teb cov yam ntxwv ntawm oscilloscope.
Cov tshuaj tiv thaiv kab mob tau muab faib ua ob pawg
Cov yam ntxwv teb ntawm oscilloscope feem ntau xa mus rau "tus yam ntxwv kis tau tus mob" ntawm tag nrho cov kev ntsuas los ntawm cov khoom siv nkag mus rau qhov screen zaub. Feem ntau, nws tuaj yeem muab faib ua ob pawg: Gaussian Response type reaction system thiab Brick-wall Response type reaction system. Cib phab ntsa teb qhov system tseem hu ua cov lus teb tiaj tus.
Txhawm rau kom paub qhov txawv lossis sib piv qhov sib txawv ntawm ob hom kab ke no, txoj hauv kev yooj yim tshaj plaws yog saib ob qhov tsis sib xws ntawm "-3dB zaus yam ntxwv" thiab "kauj ruam waveform teb".
Feem ntau siv analog oscilloscopes yog Gaussian cov lus teb, thiab lawv cov yam ntxwv zaus yuav maj mam poob ntawm lub xub pwg sab xis. Txawm li cas los xij, txawm hais tias qhov kev nkag siab ntawm cov kauj ruam waveform yog li cas, nws tsis yooj yim los tsim waveform distortion, uas yog, yuav tsis muaj kev nrawm nrawm ntawm cov kauj ruam waveform (Preshoot), overshoot tom qab waveform, los yog ringing (Ringing). ) ntawm lub waveform vibrating nce thiab nqis. Qhov no yog qhov xav tau tshwj xeeb thaum ntsuas cov cim hluav taws xob digital nrog lub sijhawm hloov pauv luv.
Lub analog oscilloscope yuav tsum hloov qhov hluav taws xob me me ntawm ob peb mV inputted ntawm cov tswv yim kawg rau hauv qhov hluav taws xob ntawm ntau pua mV los ntawm ntau theem ntawm amplification circuits kom ntseeg tau tias nws txaus los tsav CRT zaub. Cov yam ntxwv teb zaus ntawm cov amplifier circuits yog raws nraim Gaussian.
Thaum ntsuas lub waveform ntawm lub high-speed serial interface, ib tug real-time sampling broadband digital oscilloscope feem ntau yog siv. Hom oscilloscope no feem ntau siv lub cib phab ntsa teb hom lus teb.
Cov lus teb yam ntxwv ntawm lub cib phab ntsa teb hom kuj hu ua "lub siab tshaj plaws tiaj tus teb". Cov lus teb zaus yog heev tiaj tus nyob rau hauv lub zaus band, tab sis thaum nws ncav cuag lub yob-tawm sab nraum lub zaus band, lub teeb liab yog heev ntxhab. Nrog xws li cov yam ntxwv zoo tagnrho zaus, yuav tsis muaj kev cuam tshuam ntawm lub teeb liab amplitude nyob rau hauv lub zaus band. Tshaj li qhov zaus band, lub teeb liab amplitude dhau los ua xoom.
