Tushen siginar na iya samar da ingantattun siginonin gwaji masu ƙarfi don sassa daban-daban da aikace-aikacen gwajin tsarin. Mai samar da siginar yana ƙara ingantaccen aikin daidaitawa, wanda zai iya taimakawa yin siginar tsarin da yin gwajin aikin mai karɓa. Dukkan siginar vector da tushen siginar RF ana iya amfani da su azaman tushen siginar gwaji. A ƙasa muna da nasu halaye a karkashin bincike.

Tushen siginar na iya samar da ingantattun siginonin gwaji masu ƙarfi don sassa daban-daban da aikace-aikacen gwajin tsarin. Mai samar da siginar yana ƙara ingantaccen aikin daidaitawa, wanda zai iya taimakawa yin siginar tsarin da yin gwajin aikin mai karɓa. Dukkan siginar vector da tushen siginar RF ana iya amfani da su azaman tushen siginar gwaji. A ƙasa muna da nasu halaye a karkashin bincike.
Menene bambanci tsakanin siginar vector da tushen siginar RF?
1. Gabatarwa zuwa Tushen Siginar Vector
Mai samar da siginar siginar vector ya bayyana a cikin 1980s, kuma yayi amfani da tsaka-tsaki na siginar siginar vector wanda aka haɗa tare da hanyar jujjuyawar mitar rediyo don samar da siginar daidaitawa. Ka'idar ita ce yin amfani da na'ura mai haɗawa da mitar don samar da siginar oscillator na gida mai ci gaba da canzawa ta microwave da tsayayyen siginar mitar mitar. Matsakaicin siginar mitar da siginar tushe suna shigar da na'urar motsi don samar da sigina mai daidaitawa na mitar mitar mai tsayayyen mitar mai ɗaukar hoto (mitar mai ɗauka shine mitar siginar aya). sigina. Siginar mitar rediyo tana ƙunshe da bayanin tushe guda ɗaya kamar siginar daidaitawa ta mitar mitar. Sa'an nan siginar RF tana daidaita sigina kuma ana daidaita shi ta naúrar sanyaya siginar, sannan a aika zuwa tashar fitarwa don fitarwa.

Ƙirƙirar mitar siginar siginar vector, juzu'i na sanyaya sigina, tsarin daidaitawa na analog da sauran fannoni iri ɗaya ne da janareta na sigina na yau da kullun. Bambanci tsakanin janareta na siginar vector da janareta na sigina na yau da kullun shine na'urar daidaitawa ta vector da sashin samar da siginar baseband.

Kamar na'urar daidaitawa, ƙirar dijital kuma tana da hanyoyi na asali guda uku, wato amplitude modulation, canjin lokaci da daidaitawar mita. Na'urar modulator yawanci yana ƙunshe da raka'a masu aiki huɗu: na gida oscillator 90 ° na'ura mai canzawa lokaci yana canza siginar shigarwar RF zuwa siginonin RF guda biyu; Raka'o'in mahaɗa guda biyu suna canza siginar tushe a cikin lokaci da siginar quadrature ninka tare da siginar RF daidai da haka; Naúrar haɗin wutar lantarki ta tattara sigina biyu bayan ninkawa da fitarwa. Gabaɗaya, duk tashar shigarwa da fitarwa ana ƙarewa a ciki tare da nauyin 50Ω kuma ana ɗaukar hanyar tuki na sigina na banbanta don rage asarar dawowar tashar jiragen ruwa da haɓaka aikin injin injin.

Ana amfani da naúrar samar da siginar baseband don samar da siginar da aka canza ta lambobi da ake buƙata, kuma za'a iya saukar da siginar da mai amfani ya bayar zuwa ƙwaƙwalwar waveform don samar da tsarin da aka ayyana mai amfani. Babban janareta na siginar baseband yawanci yana ƙunshe da na'urar fashewa, janareta na bayanai, janareta na alama, matattarar amsawa mai ƙarewa (FIR), mai gyara dijital, DAC, da tacewa na sake ginawa.

2. Gabatarwar tushen siginar RF
Fasahar haɗa mitar ta zamani takan yi amfani da hanyar haɗin kai kai tsaye don haɗa mitar babban tushen jijjiga da mitar tushen mitar ta hanyar madauki mai kulle lokaci. Yana buƙatar ƙarancin kayan aikin masarufi, babban abin dogaro, da kewayon mitar mai faɗi. Mahimmancin sa madauki ne mai kulle-kulle, kuma tushen siginar RF ra'ayi ne mai faɗin gaske. Gabaɗaya magana, kowane tushen siginar da zai iya haifar da siginar RF zai iya hawa tushen siginar RF. Tushen siginar siginar na yanzu galibi suna cikin rukunin RF, don haka ana kiran su tushen siginar vector RF.

Na uku, bambanci tsakanin sigina biyu
1. Tsabtataccen siginar siginar rediyo ana amfani da ita ne kawai don samar da siginar mitar rediyo na analog, kuma gabaɗaya ba a amfani da shi don samar da siginonin da aka daidaita, musamman siginar da aka gyara na dijital. Wannan nau'in tushen siginar gabaɗaya yana da maɗaurin mitar mai faɗi da babban kewayon ƙarfin ƙarfi.

2. Ana amfani da tushen siginar siginar mafi yawa don samar da siginar vector, wato, siginar da aka saba amfani da su a cikin sadarwar dijital, kamar l / Q modulation: TAMBAYA, FSK, MSK, PSK, QAM, I / Q na musamman, 3GPPLTE FDD da TDD, 3GPPFDD / HSPA / HSPA +, GSM / EDGE / EDGE juyin halitta, TD-SCDMA, WiMAX? Da sauran ma'auni. Don tushen siginar vector, saboda na'urar modulator na ciki, mitar ba ta da yawa sosai (kimanin 6GHz). Ma'anar ma'auni na mai daidaitawa (kamar ginanniyar siginar siginar siginar tushe) da adadin tashoshi na sigina shine mahimman bayanai.

Disclaimer: Wannan labarin labarine da aka sake bugawa. Manufar wannan labarin shine don ƙaddamar da ƙarin bayani, kuma haƙƙin mallaka na ainihin marubucin. Idan bidiyo, hotuna, da rubutun da aka yi amfani da su a wannan labarin sun ƙunshi batutuwan haƙƙin mallaka, da fatan za a tuntuɓi editan don magance su.