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Numarul de valori este determinat de numarul de biti utilizati pentru conversie (CAN-urile moderne utilizeaza de regula 12 16 biti).
Condensatorul se încarca cu tensiunea de intrare;.
La un moment de esantionare, comutatorul electronic conecteaza bufferul si condensatorul la semnalul de intrare;.Operatiunea de esantionare si retinere (sample and hold) consta în urmatoarele etape principale:.Sarcina condensatorului este mentinuta atâta timp cât CAN-ul converteste semnalul;.Întregul proces este repetat la urmatorul moment de esantionare.Pentru majoritatea aplicatiilor, tensiunea electrica de intrare nu este furnizata direct CAN-ului, ci printr-un dispozitiv numit element de esantionare si retinere (memorare) sample-hold (S/H).În timpul cuantificarii, CAN-ul foloseste un numar finit de valori pentru reprezentarea semnalului analogic.O data realizata esantionarea adica preluarea esantioanelor din semnalul de intrare, semnalul esantionat trebuie convertit din tensiune (asa cum se afla la iesirea circuitului S/H) într-un numar binar pe care sistemul de calcul îl poate citi si prelucra.
Circuitul S/H contine bufferele de intrare si de iesire de tip amplificator BI si BO, translatorul de nivel TN care asigura executia corecta a comenzii de esantionare/memorare, comutatorul (cheia) electronic CE si condensatorul de memorare.
Un circuit de intrare analogica utilizat pentru esantionarea semnalelor contine de regula un multiplexor, un circuit S/H si un CAN Fig.
Circuitele S/H sunt alcatuite de regula dintr-un buffer urmat de un comutator electronic conectat la un condensator.
Open, un convertor analog-numeric accepta la intrare un semnal continuu în timp x(t) sub forma unei tensiuni electrice si furnizeaza la iesire o secventa de numere binare x(n care aproximeaza esantioanele corespunzatoare x(nTe).
Elementul S/H este un circuit analogic care masoara semnalul de intrare în ritmul unui tact (multiplu de Te) si mentine acest semnal fixat pentru un interval de timp suficient de mare pentru ca operatiunea de conversie analog-numerica sa se poata realiza.Conversia semnalului esantionat, caracterizat de valori ale amplitudinii infinit precise, în numar binar se numeste cuantificare.Atunci când CE este închis circuitul este în asa-numitul regim de esantionare sau de urmarire, iar când CE este deschis regimul de memorare.Daca sunt mai multe canale conectate (multiplexate) la un CAN, etapele anterioare sunt repetate pentru fiecare canal de intrare;.Deoarece operatiunea de conversie analog-numerica este relativ lenta, este important ca o eventuala variatie a tensiunii cd detonautas ao vivo no rock in rio de intrare sa nu perturbe procesul de conversie, si prin urmare circuitul S/H previne aceste perturbatii prin mentinerea constanta a tensiunii de intrare pe durata desfasurarii unei conversii.