Ukuhlaziywa kwamaphutha esistimu ye-Photodetector

Ukuhlaziywa kwamaphutha esistimu ye-Photodetector

I. Isingeniso Sezici Ezithonya Zamaphutha Esistimu kuIsithwebuli sezithombe

Ukucatshangelwa okuqondile kwephutha elihlelekile kuhlanganisa: 1. Ukukhetha ingxenye:ama-photodiode, ama-amplifiers okusebenza, ama-resistors, ama-capacitor, ama-ADC, ama-ics wokuphakela amandla, nemithombo yamandla kagesi eyinkomba. 2. Indawo yokusebenza: Ithonya lokushisa kanye nomswakama, njll. 3. Ukuthembeka kwesistimu: Ukuzinza kwesistimu, ukusebenza kwe-EMC.

Ii. Ukuhlaziywa Kwephutha Lesistimu lama-Photodetectors

1. I-Photodiode: Ku-aukutholwa kwe-photoelectricuhlelo, ithonya lama-photodiodes emaphutheni weisistimu ye-photoelectricibonakala ngokuyinhloko kulezi zici ezilandelayo:

(1) Ukuzwela (S)/ Ukulungiswa: Isilinganiso sokukhuphuka kwesiginali (i-voltage/yamanje) △y ekunyusweni kokokufaka △x okubangela ukukhuphuka kokukhiphayo △y. Okusho ukuthi, s=△y/△x. Ukuzwela/ukulungiswa kuyisimo esiyinhloko sokukhetha inzwa. Le pharamitha ibonakala ngokuqondile ekusebenzelaneni okuqondile kwama-photodiode njengamanje amnyama, kanye nasekubonakalisweni okuqondile kwama-photodetectors njengamandla alingana nomsindo (NEP). Ngakho-ke, ukuhlaziya okubaluleke kakhulu kwephutha elihlelekile kudinga ukuthi ukuzwela (S)/isixazululo kufanele sibe phezulu kunesidingo sangempela sephutha ukuze kuhlangatshezwane nezidingo zephutha zalo lonke uhlelo lukagesi wezithombe, njengoba umthelela wephutha odalwe izici ezishiwo kamuva nawo udinga ukucatshangelwa.

(2) Umugqa (δL) : Izinga lomugqa wobudlelwano bobuningi phakathi kokuphumayo nokokufaka kwesitholi sesithombe. I-yfs iwukukhipha kwesikali esigcwele, futhi △Lm ukuchezuka okuphezulu komugqa. Lokhu kubonakaliswa ngokuqondile kumugqa kanye namandla okukhanya okugcwaliswa komugqa we-photodetector.

(3) Ukuzinza/Ukuphindaphinda: I-photodetector inokungahambisani kokuphumayo kokufaka okungahleliwe okufanayo, okuyiphutha elingahleliwe. Ukuchezuka okuphezulu kokushaywa phambili nokuhlehla kuyacatshangelwa.

(4) I-Hysteresis: Isenzakalo lapho amajika wesici sokufaka-okukhiphayo we-photodetector engadluleli phakathi nohambo lwaso lokuya phambili nokuhlehla.

(5) I-Temperature drift: Umthelela wokushintsha kwe-1℃ ngakunye kwezinga lokushisa ekushintsheni kokuphumayo kwe-photodetector. Ukuchezuka kokukhukhuleka kwezinga lokushisa △Tm okubangelwa ukukhukhuleka kwezinga lokushisa kubalwa ngesibalo sokukhukhuleka kwezinga lokushisa kwebanga lokushisa lendawo yokusebenza △T.

(6) I-Drift yesikhathi: Isenzakalo lapho ukukhishwa kwe-photodetector kushintsha khona ngokuhamba kwesikhathi lapho okuhlukile kokufaka kuhlala kungashintshiwe (izimbangela ngokuvamile zibangelwa izinguquko esakhiweni saso sokuqamba). Umthelela wokuchezuka ophelele we-photodetector ohlelweni ibalwa ngesamba se-vector.

2. Ama-amplifiers okusebenza: Amapharamitha Abalulekile Athinta Iphutha Lesistimu I-Operational Amplifiers Offset voltage Vos, Vos temperature drift, input offset current Ios, Ios lokushisa drift, input bias current Ib, impedance input, input capacitance, umsindo (input voltage umsindo, input current umsindo) Design zuza ukunqanyulwa kwe-PS umsindo ojwayelekile (CMR), i-open-loop gain (AoL), umkhiqizo we-gain-bandwidth (GBW), isilinganiso sokubulala (SR), isikhathi sokusungulwa, ukuhlanekezela okuphelele kwe-harmonic.

Nakuba imingcele yama-amplifiers okusebenza ibaluleke njengengxenye yesistimu njengokukhethwa kwama-photodiode, ngenxa yokulinganiselwa kwesikhala, izincazelo zepharamitha ethile nezincazelo ngeke zichazwe lapha. Ekwakhiweni kwangempela kwama-photodetectors, umthelela wale mingcele kumaphutha esistimu kufanele wonke uhlolwe. Nakuba kungewona wonke amapharamitha angaba nomthelela omkhulu ezidingweni zephrojekthi yakho, kuye ngezimo zangempela zohlelo lokusebenza kanye nezidingo ezahlukene, imingcele engenhla izoba nemiphumela ehlukile emaphutheni esistimu.

Kunemingcele eminingi yama-amplifiers okusebenza. Ezinhlotsheni zesignali ezihlukene, imingcele eyinhloko ebangela amaphutha ahlelekile ingagxilwa kumasignali e-DC kanye ne-AC: amasignali aguquguqukayo e-DC Input offset voltage Vos, Vos temperature drift, input offset current Ios, input bias current Ib, impedance yokufaka, umsindo (input voltage sound, input current sound, design zuza umsindo oshisayo), ukwenqatshwa kwe-CMR rejection (ukwenqatshwa kwe-CM). Isignali yokushintshashintsha kwe-Ac: Ngaphezu kwamapharamitha angenhla, okulandelayo nakho kudingeka kucatshangelwe: amandla okufaka, inzuzo evulekile-loop (AoL), umkhiqizo we-gain-bandwidth (GBW), isilinganiso sokubulala (SR), isikhathi sokusungulwa, kanye nokuhlanekezela okuphelele kwe-harmonic.