Phapano ke efe lipakeng tsa lets'oao la vector le mohloli oa lets'oao la RF?

Mohloli oa lets'oao o ka fana ka matšoao a tlhahlobo a nepahetseng le a tsitsitseng haholo bakeng sa likarolo tse fapaneng le lits'ebetso tsa tlhahlobo ea sistimi. Jenereithara ea matšoao e eketsa ts'ebetso e nepahetseng ea modulation, e ka thusang ho etsisa lets'oao la sistimi le ho etsa tlhahlobo ea ts'ebetso ea moamoheli. Ka bobeli lets'oao la vector le mohloli oa lets'oao la RF li ka sebelisoa e le mohloli oa lets'oao la tlhahlobo. Ka tlase re na le litšobotsi tsa bona tlas'a tlhahlobo.

Mohloli oa lets'oao o ka fana ka matšoao a tlhahlobo a nepahetseng le a tsitsitseng haholo bakeng sa likarolo tse fapaneng le lits'ebetso tsa tlhahlobo ea sistimi. Jenereithara ea matšoao e eketsa ts'ebetso e nepahetseng ea modulation, e ka thusang ho etsisa lets'oao la sistimi le ho etsa tlhahlobo ea ts'ebetso ea moamoheli. Ka bobeli lets'oao la vector le mohloli oa lets'oao la RF li ka sebelisoa e le mohloli oa lets'oao la tlhahlobo. Ka tlase re na le litšobotsi tsa bona tlas'a tlhahlobo.
Phapano ke efe lipakeng tsa lets'oao la vector le mohloli oa lets'oao la RF?
1. Kenyelletso ea Mohloli oa Letšoao la Vector
Jenereithara ea mats'oao a vector e hlahile lilemong tsa bo-1980, 'me ea sebelisa mokhoa oa ho feto-fetoha ha maqhubu a mahareng a maqhubu a kopaneng le mokhoa oa ho fetolela maqhubu a radio tlase ho hlahisa lets'oao la molumo oa vector. Molao-motheo ke ho sebelisa yuniti ea frequency synthesis ho hlahisa lets'oao la oscillator ea lehae la microwave le lets'oao le tsitsitseng la maqhubu a mahareng. Letšoao la maqhubu a mahareng le lets'oao la baseband li kenya modulator ea vector ho hlahisa lets'oao le fetotsoeng la maqhubu a mahareng le leqhubu le tsitsitseng la mojari (maqhubu a sepalangoang ke maqhubu a lets'oao la maqhubu a ntlha). sesupo. Leqhubu la maqhubu a seea-le-moea le na le tlhahisoleseding ea baseband e tšoanang le ea maqhubu a mahareng a lets'oao la molumo oa vector. Joale lets'oao la RF le hlophisitsoe le ho hlophisoa ke yuniti ea boemo ba lets'oao, ebe le romelloa koung ea tlhahiso bakeng sa tlhahiso.

Vector signal generator frequency synthesis sub-unit, sub-unit sub-unit conditioning, analog modulation system le lintlha tse ling li tšoana le jenereithara e tloaelehileng ea matšoao. Phapang lipakeng tsa jenereithara ea lets'oao la vector le jenereithara e tloaelehileng ea lets'oao ke yuniti ea modulation ea vector le yuniti ea tlhahiso ea matšoao a baseband.

Joalo ka ho feto-fetoha ha analoge, ho feto-fetoha ha dijithale le hona ho na le mekhoa e meraro ea mantlha, e leng ho feto-fetoha ha amplitude, ho feto-fetoha ha mekhahlelo le ho feto-fetoha ha maqhubu. Vector modulator hangata e na le diyuniti tse nne tse sebetsang: yuniti ya selehae ya oscillator 90 ° phase-shifting power karohano e fetola letshwao la RF le kenyang matshwao a mabedi a orthogonal RF; li-mixer unit tse peli li fetola lets'oao la baseband in-phase le lets'oao la quadrature Ikatifatsa ka lets'oao le ts'oanang la RF ka ho latellana; yuniti ea ho kopanya matla e akaretsa matšoao a mabeli ka mor'a ho atisa le ho hlahisa. Ka kakaretso, likou tsohle tsa ho kenya le tse hlahisoang li felisitsoe ka har'a moroalo oa 50Ω mme li sebelisa mokhoa o fapaneng oa ho khanna ka mats'oao ho fokotsa tahlehelo ea boema-kepe le ho ntlafatsa ts'ebetso ea modulator ea vector.

Yuniti e hlahisang mats'oao a baseband e sebelisetsoa ho hlahisa lets'oao la baseband le hlokahalang ka dijithale, mme waveform e fanoeng ke mosebelisi le eona e ka khoasolloa mohopolong oa waveform bakeng sa ho hlahisa sebopeho se hlalositsoeng ke mosebelisi. Jenereithara ea lets'oao la baseband hangata e na le processor e phatlohileng, jenereithara ea data, jenereithara ea matšoao, filthara ea finite impulse reaction (FIR), resampler ea dijithale, DAC, le filthara ea kaho bocha.

2. Kenyelletso ea mohloli oa matšoao a RF
Theknoloji ea sejoale-joale ea "frequency synthesis" hangata e sebelisa mokhoa o sa tobang oa ho kopanya maqhubu a mohloli o ka sehloohong oa vibrate le maqhubu a mohloli oa litšupiso ka loop e notletsoeng. E hloka lisebelisoa tse fokolang tsa hardware, botšepehi bo phahameng, le mefuta e mengata ea maqhubu. Motheo oa eona ke loop e notletsoeng ka mekhahlelo, 'me mohloli oa lets'oao la RF ke mohopolo o batlang o pharalletsoe. Ka kakaretso, mohloli ofe kapa ofe oa lets'oao o ka hlahisang lets'oao la RF o ka tsamaisa mohloli oa lets'oao la RF. Mehloli ea hona joale ea mats'oao a vector hangata e le sehlopheng sa RF, kahoo e boetse e bitsoa mehloli ea matšoao a vector RF.

Ea boraro, phapang pakeng tsa lipontšo tse peli
1. Mohloli o hloekileng oa maqhubu a seea-le-moea o sebelisoa feela ho hlahisa matšoao a maqhubu a seea-le-moea sa analoge, 'me ka kakaretso ha o sebelisoe ho hlahisa matshwao a fetotsoeng, haholo-holo mats'oao a fetotsoeng a dijithale. Mofuta ona oa mohloli oa lets'oao ka kakaretso o na le sehlopha se pharaletseng sa maqhubu le mefuta e mengata ea matla a matla.

2. Mohloli oa lets'oao la vector o sebelisoa haholo ho hlahisa matšoao a vector, ke hore, matšoao a tloaelehileng a sebelisoang puisanong ea dijithale, joalo ka l / Q modulation: ASK, FSK, MSK, PSK, QAM, customized I / Q, 3GPPLTE FDD le TDD, 3GPPFDD / HSPA / HSPA +, GSM / EDGE / EDGE evolution, TD-SCDMA, WiMAX? Le litekanyetso tse ling. Bakeng sa mohloli oa lets'oao la vector, ka lebaka la modulator ea eona ea kahare ea sehlopha, hangata maqhubu ha a phahame haholo (hoo e ka bang 6GHz). Lenane le ts'oanang la modulator ea lona (joaloka "baseband signal bandwidth" e hahiloeng) le palo ea likanale tsa matšoao ke index ea bohlokoa.

Boitlhotlhollo: Sengoliloeng sena ke sengoloa se hatisitsoeng bocha. Sepheo sa sengoloa sena ke ho fetisa tlhahisoleseling e eketsehileng, 'me litokelo tsa molao ke tsa mongoli oa pele. Haeba livideo, litšoantšo le litemana tse sebelisitsoeng sengolong sena li ama litaba tsa litokelo, ka kopo ikopanye le mohlophisi ho sebetsana le tsona.