Oscilloscope teb Systems thiab cov yam ntxwv
Cov yam ntxwv teb ntawm oscilloscope yuav muaj kev cuam tshuam rau lub waveform ntawm lub teeb liab thiab hloov kev suav ntawm lub sijhawm nce ntawm lub teeb liab. Thaum Pentium 4 nkag mus rau lub sijhawm gigahertz, Serial ATA thiab PCI Express thiab lwm qhov kev sib txuas siab lossis cov tsheb npav kuj tau dhau Gbps ib qho tom qab, xaiv qhov kev sojntsuam tsim nyog yog qhov tseem ceeb, tab sis xaiv txoj cai oscilloscope kuj yog ib txoj haujlwm tseem ceeb. .
Kev ntsuas waveforms los ntawm cov khoom sib txuas yog coj mus kuaj thiab ua tiav kom pom ntawm qhov screen, thiab cov ntaub ntawv raug cawm tib lub sijhawm. 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 yog ib qho tseem ceeb tsis tsuas yog ntsuas qhov zaus thiab bandwidth, tab sis kuj yuav tsum paub txog oscilloscope cov lus teb cov yam ntxwv. Piv txwv li, thaum ntsuas qhov kev hloov ntawm lub teeb liab siab heev, nws yuav txawv vim qhov sib txawv ntawm oscilloscope cov yam ntxwv teb.
Cov lus teb tau muab faib ua ob pawg loj
Oscilloscope cov yam ntxwv teb yog xa mus rau "tus yam ntxwv hloov pauv" ntawm tag nrho cov kev ntsuas ntsuas los ntawm cov khoom siv nkag mus rau qhov screen zaub. Feem ntau, lawv tuaj yeem muab faib ua ob pawg: Gaussian Response thiab Brick-wall Response. Brick-wall teb systems kuj hu ua Flat Response.
Txhawm rau paub qhov txawv lossis sib piv qhov sib txawv ntawm ob hom kab ke no, txoj hauv kev yooj yim tshaj plaws yog saib ntawm "-3dB zaus yam ntxwv" thiab "kauj ruam (Step) waveform teb" ntawm ob qho piv txwv.
Feem ntau siv analogue oscilloscopes muaj nyob rau hauv Gaussian teb system, nws zaus cov yam ntxwv yuav nyob rau hauv txoj cai xub pwg kawg ntawm qhov qeeb qeeb, thiab cov kauj ruam waveform input txawm tias tus steeper, tab sis kuj tsis nquag waveform distortion, uas yog, tsis tsim cov kauj ruam. waveform momentary rau pem hauv ntej (Preshoot), waveforms tom qab overshoot (Overshoot), los yog lub waveforms nce thiab nqis vibration ntawm lub nplhaib (Ringing) thiab lwm yam tshwm sim. Qhov no yog ib qho kev xav tau tus yam ntxwv thaum ntsuas digital circuit signals nrog lub sijhawm hloov pauv luv.
Analogue oscilloscopes yuav tsum hloov lub teeb liab me me ntawm ob peb mV ntawm cov tswv yim rau 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 qhov tseeb Gaussian.
Thaum ntsuas cov waveforms ntawm high-speed serial interfaces, broadband digital oscilloscopes feem ntau siv cov qauv ntawm lub sij hawm, thiab cov oscilloscopes feem ntau siv lub cib-phab ntsa teb hom lus teb.
Cib phab ntsa teb hom lus teb cov yam ntxwv, tseem hu ua "siab tshaj plaws tiaj tus teb", nyob rau hauv lub zaus band zaus teb yog tsis tshua muaj pav ca, thiab tawm ntawm lub zaus band mus rau lub turn down (Roll-Off), lub teeb liab yog heev ntxhab. Nrog xws li cov yam ntxwv zoo tagnrho zaus, tsis muaj qhov txo qis ntawm lub teeb liab amplitude hauv cov zaus band. Dhau ntawm cov qhab, lub teeb liab amplitude dhau los ua xoom.
