Ichi chinyorwa chinotsanangura iwo mana ekutanga maitiro eRF maseketi kubva kune mana maficha: RF interface, diki inotarisirwa chiratidzo, hombe yekukanganisa chiratidzo, uye kupindira kubva kumatanho ari padyo, uye inopa zvakakosha izvo zvinoda kutariswa zvakanyanya muPCB dhizaini maitiro.
RF yedunhu simulation yeiyo interface yeRF
Wireless transmitter uye inogamuchira mune iyo pfungwa, inogona kupatsanurwa kuita zvikamu zviviri zveiyo yakakosha frequency uye radio frequency.Iyo yakakosha frequency ine frequency renji yeinopinza chiratidzo cheiyo transmitter uye frequency renji yeinobuda chiratidzo cheanogamuchira.Iyo bandwidth yeiyo yakakosha frequency inotarisisa chiyero chekutanga icho data inogona kuyerera muhurongwa.Iyo yakakosha frequency inoshandiswa kunatsiridza kuvimbika kwekuyerera kwedata uye kuderedza mutoro wakaiswa neanotapurirana pane yekufambisa svikiro pane yakapihwa data data.Naizvozvo, iyo PCB dhizaini yeiyo yakakosha frequency reketi inoda ruzivo rwakakura rwechiratidzo chekugadzira engineering.Iyo RF yedunhu redhisheni inoshandura uye inokwirisa iyo yakagadziriswa yakakosha frequency siginecha kune yakatsanangurwa chiteshi uye inopinza iyi siginecha mukati mekutapurirana svikiro.Sezvineiwo, iyo inogamuchira RF yedunhu inotora chiratidzo kubva kune inotapurirana midhiya uye inoshandura uye nekudzikisira iyo kune yakakosha frequency.
Matransmitter ane maviri makuru PCB dhizaini zvinangwa: chekutanga ndechekuti ivo vanofanirwa kufambisa yakati wandei yesimba vachiri kushandisa hushoma huwandu hwesimba hunogoneka.Chechipiri ndechekuti ivo havagone kupindira neakajairika kushanda kweiyo transceiver mumatanho ari padyo.Mukutaura kweanogamuchira, kune matatu makuru PCB ekugadzira zvinangwa: kutanga, ivo vanofanira kunyatso kudzorera zvikwangwani zvidiki;chechipiri, vanofanira kukwanisa kubvisa zviratidzo zvekuvhiringidza kunze kwechiteshi chinodiwa;poindi yekupedzisira yakafanana neinotumira, ivo vanofanirwa kushandisa simba shoma.
RF yedunhu simulation yemasaini makuru anopindira
Vagamuchiri vanofanira kuva nehanya nezviratidzo zviduku, kunyange kana zviratidzo zvakakura zvinopindira (blockers) zviripo.Mamiriro ezvinhu aya anomuka paunenge uchiedza kugashira chiratidzo chisina kusimba kana chiri kure chine simba rekufambisa nhepfenyuro muchiteshi chiri pedyo.Chiratidzo chinopindira chinogona kunge chiri 60 kusvika 70 dB yakakura kudarika chiratidzo chinotarisirwa uye chinogona kuvharidzira kugamuchirwa kwechiratidzo chenguva dzose muchikamu chekupinza chemugamuchiri nehuwandu hwekuvhara kana nekuita kuti mugamuchiri abudise huwandu hwakawandisa hwemhere mukati. chikamu chekupinza.Iwo matambudziko maviri ataurwa pamusoro apa anogona kuitika kana mugamuchiri, ari muchikamu chekupinza, anofambiswa munharaunda yekusaenderana nekwakabva kupindira.Kuti udzivise matambudziko aya, iyo yekumberi yekupedzisira yeanogamuchira inofanirwa kuve yakanyatso mutsara.
Naizvozvo, "mutsara" zvakare chinhu chakakosha chekufungisisa paunenge uchigadzira PCB inogamuchira.Sezvo mugamuchiri ari nhete-bhendi redunhu, saka iyo isiri-linearity ndeyekuyera iyo "intermodulation distortion (intermodulation distortion)" kune manhamba.Izvi zvinosanganisira kushandisa maviri sine kana cosine masaisai akafanana frequency uye ari pakati bhendi (mubhendi) kutyaira iyo yekuisa chiratidzo, uyezve kuyera chigadzirwa chekukanganisa kwayo kwepakati.Kakawanda, SPICE isoftware inopedza nguva uye inodhura yekunyepedzera nekuti inofanirwa kuita matenderedzwa akawanda isati yawana inodiwa frequency resolution kuti inzwisise kukanganisa.
RF yedunhu simulation yechiratidzo chidiki chinodiwa
Iye anogamuchira anofanirwa kuve akangwarira kuti aone masaini madiki ekuisa.Kazhinji, simba rekupinza remugamuchiri rinogona kunge ridiki se1 μV.kunzwisiswa kweanogamuchira kunogumira neruzha rwunogadzirwa nedunhu rayo rekupinza.Naizvozvo, ruzha chinhu chakakosha chekufungisisa paunenge uchigadzira inogamuchira yePCB.Uyezve, kuve nekugona kufanotaura ruzha nematurusi ekuenzanisa kwakakosha.Mufananidzo 1 inowanzoitika superheterodyne (superheterodyne) inogamuchira.Chiratidzo chinogamuchirwa chinotanga kusefa uye ipapo chiratidzo chekuisa chinowedzerwa neakadzika-ruzha amplifier (LNA).Yekutanga oscillator yemuno (LO) inobva yashandiswa kusanganisa nechiratidzo ichi kushandura iyi siginecha kuva yepakati frequency (IF).Kumberi-kumagumo (kumberi-kumagumo) yedunhu ruzha kushanda kunoenderana zvakanyanya neLNA, musanganiswa (musanganiswa) uye LO.kunyangwe kushandiswa kwakajairwa kweSpice ruzha kuongororwa, unogona kutsvaga ruzha rweLNA, asi kumusanganisi uye LO, hazvibatsiri, nekuti ruzha rwuri mumabhuraki aya, ruchave rwakakura kwazvo chiratidzo cheLO chakakanganiswa zvakanyanya.
Iyo diki yekupinza chiratidzo inoda kuti inogamuchira iwedzere kukwidziridzwa, kazhinji ichida kuwana yakakwira se120 dB.Pakupfuma kwakadai, chero chiratidzo chakasanganiswa kubva kune zvakabuda (vaviri) kudzokera kune yekuisa inogona kugadzira matambudziko.Chikonzero chakakosha chekushandisa iyo super outlier receiver architecture ndechekuti inobvumira iyo pfuma kugovaniswa pamusoro akati wandei kudzikisa mukana wekubatanidza.Izvi zvakare zvinoita kuti yekutanga LO frequency isiyane neyekupinza chiratidzo frequency, inogona kudzivirira yakakura yekukanganisa chiratidzo "kusvibiswa" kune diki yekupinza chiratidzo.
Nezvikonzero zvakasiyana, mune mamwe mawaya ekutaurirana masisitimu, yakananga kutendeuka (yakananga kutendeuka) kana yemukati musiyano (homodyne) dhizaini inogona kutsiva iyo yekupedzisira-yekunze musiyano wekuvaka.Mune iyi dhizaini, iyo RF yekuisa siginecha inoshandurwa yakananga kune yakakosha frequency munhanho imwe chete, kuti yakawanda yekuwana iri muiyo yakakosha frequency uye iyo LO iri panguva yakafanana neyekupinza chiratidzo.Muchiitiko ichi, kukanganisa kwechikamu chiduku chekubatanidza kunofanira kunzwisiswa uye muenzaniso wakadzama we "nzira yakarasika yechiratidzo" inofanira kusimbiswa, yakadai se: kubatanidza kuburikidza ne substrate, kubatanidza pakati pepakeji footprint uye solder line (bondwire) , uye kubatanidza kuburikidza netambo yemagetsi.
RF Circuit Simulation yeAdjacent Channel Kupindira
Distortion inoitawo basa rakakosha mutransmitter.Iyo isina mutsara inogadzirwa neinodhindisa mune inobuda dunhu inogona kukonzera kuwanda kweiyo frequency yechiratidzo chinotapurirwa kupararira mumatanho ari padyo.Ichi chiitiko chinonzi "spectral regrowth".Chiratidzo chisati chasvika kune transmitter's power amplifier (PA), bandwidth yayo ishoma;zvisinei, "intermodulation distortion" muPA inoita kuti bandwidth iwedzere zvakare.Kana iyo bandwidth ikawedzera zvakanyanya, iyo transmitter haizokwanisa kuzadzisa zvinodiwa zvesimba zvematanho ari pedyo.Kana uchitumira dhijitari modulation siginecha, hazvigoneke kufanofungidzira kukura patsva kweiyo spectrum neSPICE.Nekuti angangoita zana edhijitari zviratidzo (chiratidzo) chekushanda kwekutapurirana kunofanirwa kutevedzerwa kuti uwane inomiririra spectrum, uye zvakare inoda kusanganisa iyo yakakwira frequency inotakura, izvi zvichaita kuti SPICE ongororo yenguva pfupi ive isingaite.
Nguva yekutumira: Mar-31-2022