Dab tsi yog qhov txawv ntawm vector teeb liab thiab RF teeb liab qhov chaw?

Lub teeb liab qhov chaw tuaj yeem muab qhov tseeb thiab ruaj khov kuaj cov cim rau ntau yam kev tivthaiv thiab cov ntawv thov kev xeem. Lub teeb liab lub tshuab hluav taws xob ntxiv qhov kev hloov kho kom raug, uas tuaj yeem pab simulate lub teeb liab ntawm lub cev thiab ua qhov kev ntsuas kev ua tau zoo. Ob lub teeb liab vector thiab RF teeb liab qhov chaw tuaj yeem siv los ua qhov kev sim teeb liab. Hauv qab no peb muaj lawv tus kheej yam ntxwv raws li kev txheeb xyuas.
Dab tsi yog qhov txawv ntawm vector teeb liab thiab RF teeb liab qhov chaw?
1. Taw qhia rau Vector Signal Source
Lub tshuab hluav taws xob vector teeb liab tau tshwm sim hauv xyoo 1980s, thiab siv cov txheej txheem nruab nrab zaus vector modulation ua ke nrog lub xov tooj cua zaus down conversion method los tsim cov vector modulation teeb liab. Lub hauv paus ntsiab lus yog siv lub tshuab hluav taws xob sib txuas los tsim kom muaj qhov sib txawv tsis tu ncua microwave hauv zos oscillator teeb liab thiab lub teeb liab nruab nrab zaus zaus. Lub teeb liab zaus nruab nrab thiab lub teeb liab baseband nkag mus rau vector modulator los ua kom muaj qhov nruab nrab zaus vector modulated teeb liab nrog rau cov cab kuj zaus (cov cab kuj zaus yog qhov zaus ntawm qhov taw tes zaus teeb liab). teeb liab. Lub xov tooj cua zaus teeb liab muaj tib cov ntaub ntawv baseband raws li qhov nruab nrab zaus vector modulation teeb liab. Lub teeb liab RF yog ces teeb liab-conditioned thiab modulated los ntawm lub teeb liab txias chav tsev, thiab ces xa mus rau qhov chaw nres nkoj tso zis.

Vector signal generator zaus synthesis sub-unit, teeb liab txias sub-unit, analog modulation system thiab lwm yam yog tib yam li cov teeb liab generator. Qhov txawv ntawm vector signal generator thiab lub teeb liab zoo tib yam generator yog vector modulation unit thiab baseband teeb liab tsim chav tsev.

Zoo li analog kev hloov pauv, cov kev hloov pauv digital kuj muaj peb txoj hauv kev, xws li kev hloov pauv hloov pauv, theem kev hloov pauv thiab hloov pauv zaus. Ib tug vector modulator feem ntau muaj plaub chav ua haujlwm: lub zos oscillator 90 ° theem-hloov fais fab faib chav hloov pauv cov tswv yim RF teeb liab rau hauv ob lub teeb liab RF orthogonal; ob chav sib xyaw ua ke hloov pauv lub hauv paus hauv-theem teeb liab thiab lub teeb liab quadrature Ntau nrog cov teeb liab RF sib xws; lub hwj chim synthesis unit sums ob lub teeb liab tom qab multiplication thiab outputs. Feem ntau, tag nrho cov tswv yim thiab cov chaw nres nkoj tso tawm sab hauv nrog 50Ω load thiab txais yuav ib qho kev sib txawv ntawm cov teeb liab tsav tsheb los txo qhov rov qab poob ntawm qhov chaw nres nkoj thiab txhim kho kev ua haujlwm ntawm vector modulator.

Baseband teeb liab tsim chav tsev yog siv los tsim cov teeb liab digitally modulated baseband teeb liab, thiab cov waveform muab los ntawm tus neeg siv kuj tuaj yeem rub tawm mus rau lub cim xeeb waveform rau tsim cov neeg siv cov hom ntawv. Baseband signal generator feem ntau muaj cov txheej txheem tawg, cov ntaub ntawv tsim hluav taws xob, lub tshuab hluav taws xob cim, cov lus teb tsis txaus ntseeg (FIR) lim, digital resampler, DAC, thiab cov lim dej rov tsim dua.

2. Taw qhia ntawm RF teeb liab qhov chaw
Niaj hnub nimno zaus synthesis technology feem ntau siv ib tug indirect synthesis txoj kev los mus cuag cov zaus ntawm lub ntsiab vibration qhov chaw thiab cov zaus ntawm cov ntaub ntawv siv zaus los ntawm ib theem-locked voj. Nws yuav tsum muaj cov cuab yeej kho vajtse tsawg dua, muaj kev ntseeg siab, thiab muaj ntau zaus. Nws cov tub ntxhais kawm yog lub voj voog kaw, thiab RF teeb liab qhov chaw yog lub tswv yim dav dav. Feem ntau hais lus, txhua qhov teeb meem uas tuaj yeem tsim lub teeb liab RF tuaj yeem caij RF teeb liab qhov chaw. Tam sim no vector teeb liab qhov chaw feem ntau nyob rau hauv RF band, yog li lawv kuj hu ua vector RF teeb liab qhov chaw.

Peb, qhov sib txawv ntawm ob lub cim
1. Lub ntshiab xov tooj cua zaus teeb liab qhov chaw tsuas yog siv los tsim cov xov tooj cua analog zaus ib zaus cov cim, thiab feem ntau tsis siv los tsim cov teeb liab modulated, tshwj xeeb tshaj yog cov teeb liab modulated. Hom teeb liab no feem ntau muaj ntau zaus band thiab lub zog loj dua dynamic ntau.

2. Cov teeb liab vector feem ntau yog siv los tsim cov teeb liab vector, uas yog, feem ntau siv cov teeb liab modulation hauv kev sib txuas lus digital, xws li l / Q modulation: ASK, FSK, MSK, PSK, QAM, customized I / Q, 3GPPLTE FDD thiab TDD, 3GPPFDD / HSPA / HSPA +, GSM / EDGE / EDGE evolution, TD-SCDMA, WiMAX? Thiab lwm yam qauv. Rau qhov vector teeb liab qhov chaw, vim nws cov khoom siv hauv band modulator, qhov zaus feem ntau tsis siab dhau (txog 6GHz). Qhov sib txuam Performance index ntawm nws cov modulator (xws li lub built-in baseband teeb liab bandwidth) thiab tus naj npawb ntawm cov teeb liab channel yog ib qho tseem ceeb index.

Disclaimer: Kab lus no yog ib tsab xov xwm rov luam tawm dua. Lub hom phiaj ntawm tsab xov xwm no yog kom dhau cov ntaub ntawv ntau ntxiv, thiab cov ntawv pov thawj yog los ntawm tus thawj sau. Yog tias cov yeeb yaj kiab, duab, thiab cov ntawv siv hauv tsab xov xwm no cuam tshuam txog kev cai lij choj, thov hu rau tus kws kho kom daws tau lawv.