I. Intshayelelo
Amanzi Angakhanyisa Amakhandlela, Ingaba Yinyani? Yinyani!
Ingaba yinyani into yokuba iinyoka ziyayoyika i-realgar? Bubuxoki!
Esiza kuxoxa ngako namhlanje yile:
Ukuphazamisana kunokuphucula ukuchaneka kokulinganisa, ngaba kunjalo?
Kwiimeko eziqhelekileyo, ukuphazamiseka lutshaba lwendalo lokulinganisa. Ukuphazamiseka kuya kunciphisa ukuchaneka kokulinganisa. Kwiimeko ezinzima, ukulinganisa akuyi kwenziwa ngokuqhelekileyo. Ngokwale mbono, ukuphazamiseka kunokuphucula ukuchaneka kokulinganisa, nto leyo engeyonyani!
Nangona kunjalo, ngaba oku kusoloko kunjalo? Ngaba kukho imeko apho ukuphazamiseka kunganciphisi ukuchaneka kokulinganisa, kodwa endaweni yoko kuyayiphucula?
Impendulo ithi ewe!
2. Isivumelwano sokuphazamisa
Xa sidibene nemeko yokwenyani, senza isivumelwano esilandelayo malunga nokuphazamiseka:
- Ukuphazamiseka akunazo izinto ze-DC. Kwimilinganiselo yokwenyani, ukuphazamiseka ikakhulu kukuphazamiseka kwe-AC, kwaye olu qikelelo lunengqiqo.
- Xa kuthelekiswa ne-voltage ye-DC elinganisiweyo, ubukhulu bokuphazamiseka buncinci. Oku kuhambelana nemeko yokwenyani.
- Ukuphazamiseka sisibonakaliso sexesha elithile, okanye ixabiso eliphakathi liyi-zero kwixesha elithile elimiselweyo. Eli nqaku alikho nyani ngokwenene kumlinganiselo wokwenyani. Nangona kunjalo, ekubeni ukuphazamiseka ngokuqhelekileyo kuyisignali ye-AC ephindaphindayo ephezulu, kuninzi lokuphazamiseka, i-convention ye-zero mean ifanelekile ixesha elide.
3. Ukuchaneka komlinganiselo phantsi kokuphazamiseka
Uninzi lwezixhobo zokulinganisa zombane kunye neemitha ngoku zisebenzisa ii-AD converters, kwaye ukuchaneka kwazo kokulinganisa kunxulumene kakhulu nesisombululo se-AD converter. Ngokubanzi, ii-AD converters ezinesisombululo esiphezulu zichanekile kakhulu.
Nangona kunjalo, isisombululo se-AD sihlala silinganiselwe. Ukuba isisombululo se-AD si-3 bits kwaye i-voltage ephezulu yokulinganisa yi-8V, i-AD converter ilingana nesikali esahlulwe saba ziindidi ezi-8, ulwahlulo ngalunye yi-1V. yi-1V. Isiphumo sokulinganisa sale AD sihlala siyi-integer, kwaye inxalenye yedesimali ihlala ithwalwa okanye ilahliwe, ethathwa njengethwalwa kweli phepha. Ukuthwala okanye ukulahla kuya kubangela iimpazamo zokulinganisa. Umzekelo, i-6.3V inkulu kune-6V kwaye ingaphantsi kwe-7V. Isiphumo sokulinganisa se-AD yi-7V, kwaye kukho impazamo ye-0.7V. Le mpazamo siyibiza ngokuba yimpazamo ye-AD quantization.
Ukuze kube lula ukuhlalutya, sicinga ukuba isikali (i-AD converter) asinazo ezinye iimpazamo zokulinganisa ngaphandle kwempazamo ye-AD quantization.
Ngoku, sisebenzisa izikali ezimbini ezifanayo ukulinganisa ii-voltage ezimbini ze-DC eziboniswe kuMfanekiso 1 ngaphandle kokuphazamiseka (imeko efanelekileyo) kunye nokuphazamiseka.
Njengoko kubonisiwe kuMfanekiso 1, i-voltage ye-DC elinganisiweyo yi-6.3V, kwaye i-voltage ye-DC kumfanekiso wasekhohlo ayinayo nayiphi na i-interruption, kwaye lixabiso elingaguqukiyo. Umfanekiso ongasekunene ubonisa i-direct current ephazanyiswa yi-alternating current, kwaye kukho ukuguquguquka okuthile kwixabiso. I-voltage ye-DC kumzobo wasekunene ilingana ne-voltage ye-DC kumzobo wasekhohlo emva kokususa isignali yokuphazamiseka. Isikwere esibomvu kumfanekiso simele isiphumo sokuguqulwa kwe-AD converter.
I-voltage ye-DC efanelekileyo ngaphandle kokuphazamiseka
Faka i-voltage ye-DC ephazamisayo enexabiso eliphakathi le-zero
Yenza imilinganiselo eli-10 yombane othe ngqo kwiimeko ezimbini kumfanekiso ongentla, uze wenze umlinganiselo wemilinganiselo eli-10.
Isikali sokuqala ngasekhohlo silinganiswa izihlandlo ezili-10, kwaye ukufundwa kuyafana ngalo lonke ixesha. Ngenxa yempembelelo yempazamo ye-AD quantization, ukufundwa ngakunye yi-7V. Emva kokuba imilinganiselo eli-10 yenziwe ngokomyinge, isiphumo siseyi-7V. Impazamo ye-AD quantization yi-0.7V, kwaye impazamo yokulinganisa yi-0.7V.
Isikali sesibini ngasekunene sitshintshe kakhulu:
Ngenxa yomahluko kwi-positive ne-negative ye-interference voltage kunye ne-amplitude, impazamo ye-AD quantization yahlukile kwiindawo ezahlukeneyo zokulinganisa. Phantsi kotshintsho lwempazamo ye-AD quantization, isiphumo sokulinganisa i-AD sitshintsha phakathi kwe-6V kunye ne-7V. Ezisixhenxe zezilinganiso yayiyi-7V, ezintathu kuphela yayiyi-6V, kwaye umyinge wezilinganiso ezili-10 yayiyi-6.3V! Impazamo yi-0V!
Enyanisweni, akukho mpazamo ingenakwenzeka, kuba kwihlabathi elingenanto, akukho 6.3V engqongqo! Nangona kunjalo, kukho:
Kwimeko apho kungekho kuphazamiseka, ekubeni isiphumo ngasinye sokulinganisa sifana, emva kokulinganisa okuli-10, impazamo ayitshintshi!
Xa kukho uphazamiseko olufanelekileyo, emva kokuba imilinganiselo eli-10 yenziwe ngokomyinge, impazamo yokulinganisa i-AD incitshiswa ngokomlinganiselo wobukhulu! Isisombululo siphuculwa ngokomlinganiselo wobukhulu! Ukuchaneka komlinganiselo kuphuculwa nangomlinganiselo wobukhulu!
Imibuzo ephambili yile:
Ingaba kuyafana xa i-voltage elinganisiweyo ingamaxabiso ahlukeneyo?
Abafundi bangathanda ukulandela isivumelwano malunga nokuphazamiseka kwicandelo lesibini, baveze ukuphazamiseka ngothotho lwamaxabiso eenombolo, babeke ngaphezulu ukuphazamiseka kwi-voltage elinganisiweyo, baze babale iziphumo zokulinganisa zenqaku ngalinye ngokwemigaqo yokuthwala ye-AD converter, baze babale ixabiso eliqhelekileyo lokuqinisekisa, lo gama nje i-amplitude yokuphazamiseka inokubangela ukuba ukufundwa emva kwe-AD quantization kutshintshe, kwaye i-frequency yesampulu iphezulu ngokwaneleyo (utshintsho lwe-amplitude yokuphazamiseka lunenkqubo yokutshintsha, endaweni yexabiso ezimbini ezilungileyo nezingalunganga), kwaye ukuchaneka kufuneka kuphuculwe!
Kungangqinwa ukuba logama nje i-voltage elinganisiweyo ingeyo-integer ngqo (ayikho kwihlabathi elijolise kwinjongo), kuya kubakho impazamo ye-AD quantization, nokuba impazamo ye-AD quantization inkulu kangakanani na, logama nje ubukhulu bokuphazamiseka bungaphezulu kunempazamo ye-AD quantization okanye bungaphezulu kwesisombululo esincinci se-AD, kuya kubangela ukuba isiphumo sokulinganisa sitshintshe phakathi kwamaxabiso amabini akufutshane. Ekubeni ukuphazamiseka kufana ne-positive ne-negative symmetric, ubukhulu kunye namathuba okwehla nokunyuka ayalingana. Ke ngoko, xa ixabiso lokwenyani likufutshane neliphi ixabiso, amathuba okuba leliphi ixabiso liza kuvela likhulu, kwaye liya kuba kufutshane neliphi ixabiso emva kokulinganisa.
Oko kukuthi: ixabiso eliphakathi leemilinganiselo ezininzi (ukuphazamiseka kwexabiso eliphakathi yi-zero) kufuneka libe kufutshane nesiphumo sokulinganisa ngaphandle kokuphazamiseka, oko kukuthi, ukusebenzisa isignali yokuphazamiseka kwe-AC enexabiso eliphakathi le-zero kunye nokulinganisa imilinganiselo emininzi kunokunciphisa iimpazamo ezifanayo ze-AD Quantize, kuphuculwe isisombululo sokulinganisa i-AD, kwaye kuphuculwe ukuchaneka kokulinganisa!
Ixesha lokuthumela: Julayi-13-2023
