Zvikamu Zvisingashande muRF Circuits
Zvirambidzo, ma capacitor, maAntenna. . . . Dzidza nezvezvinhu zvisingashande zvinoshandiswa mumasisitimu eRF.
Masisitimu eRF haana kusiyana zvakanyanya nemamwe marudzi emagetsi. Mitemo yakafanana yefizikisi inoshanda, uye nekudaro zvikamu zvekutanga zvinoshandiswa mukugadzirwa kweRF zvinowanikwawo mumadhijitari edhijitari uye madhijitari eanalog ane frequency yakaderera.
Zvisinei, dhizaini yeRF inosanganisira matambudziko nezvinangwa zvakasiyana, uye nekudaro hunhu nekushandiswa kwezvikamu zvinoda kutariswa zvakanyanya patinenge tichishanda maererano neRF. Zvakare, mamwe maseketi akabatanidzwa anoita basa rakanyatsoenderana nemasisitimu eRF—haashandiswe mumaseketi ane frequency yakaderera uye anogona kusanzwisiswa zvakanaka neavo vasina ruzivo rwakawanda nematekiniki ekugadzira RF.
Tinowanzoisa zvikamu muzvikamu sezviri kushanda kana kuti zvisingashande, uye nzira iyi inoshanda zvakaenzana muRF. Nhau dzinokurukura zvikamu zvisingashande kunyanya maererano nemaseketi eRF, uye peji rinotevera rinofukidza zvikamu zvinoshanda.
Makemikari
Capacitor yakakodzera inopa mashandiro akafanana echiratidzo che1 Hz nechiratidzo che1 GHz. Asi zvikamu zvacho hazvimbofi zvakanaka, uye zvinhu zvisina kunaka zvecapacitor zvinogona kukosha zvakanyanya pamafrequency akakwira.
"C" inoenderana ne capacitor yakakodzera yakavigwa pakati pezvinhu zvakawanda zvinokanganisa masero. Tine resistance isingapere pakati pemaplates (RD), series resistance (RS), series inductance (LS), uye parallel capacitance (CP) pakati pePCB pads neground plane (tiri kufunga kuti pane zvikamu zvinoisa pamusoro pechinhu; zvimwe zvichazotevera).
Chinhu chinonyanya kukosha patinenge tichishanda nemasaini ane mafrequency akakwira ndiko kupinza simba. Tinotarisira kuti kupinza simba kwe capacitor kucharamba kuchidzikira sezvo kunowedzera mafrequency, asi kuvapo kwekuparara kwesimba kunoita kuti kupinza simba kudzika pa self-resonant frequency uye kwozotanga kuwedzera:
Vadzivisi, nevamwe.
Kunyangwe ma resistors anogona kunetsa pa high frequency, nekuti ane series inductance, parallel capacitance, uye capacitance yakajairika inobatanidzwa nema PCB pads.
Uye izvi zvinounza pfungwa inokosha: paunenge uchishanda nema frequency akakwira, zvinhu zveparasitic circuit zviri kwese kwese. Hazvina mhosva kuti chinhu chinodzivisa chiri nyore kana kuti chakanakira sei, chichiri kuda kurongedzwa nekusungirirwa kuPCB, uye mhedzisiro yacho iparasitic. Izvi zvinoshandawo kune chero chimwe chikamu: kana chikarongedzwa nekusungirirwa kubhodhi, zvinhu zveparasitic zviripo.
Makristasi
Chinangwa cheRF ndechekushandura masaini ane mafrequency akawanda kuitira kuti atumire ruzivo, asi tisati tashandura tinofanira kugadzira. Sezvinoita mune mamwe marudzi emaseketi, makristaro inzira huru yekugadzira referensi yefrequency yakagadzikana.
Zvisinei, mukugadzirwa kwedhijitari uye masaini akasanganiswa, zvinowanzoitika kuti macircuit akavakirwa pakristaro haadi kunyatsojeka kunogona kupihwa nekristaro, uye nekudaro zviri nyore kushaya hanya maererano nekusarudza kwekristaro. RF circuit, zvakasiyana, inogona kunge iine zvinodiwa zvakanyanya zvefrequency, uye izvi zvinoda kwete kungojeka kwekutanga kwefrequency asiwo kugadzikana kwefrequency.
Kuwanda kwe oscillation kwekristaro yakajairika kunonyanya kuenderana nekuchinja kwetembiricha. Kusagadzikana kwefrequency kunokonzerwa nako kunokonzera matambudziko kune masisitimu eRF, kunyanya masisitimu achasangana nekuchinja kukuru kwekupisa kwe ambient. Saka, sisitimu inogona kuda TCXO, kureva, oscillator yekristaro inobhadharwa tembiricha. Midziyo iyi inosanganisira circuitry inotsiva kusiyana kwefrequency yekristaro:
MaAntena
Antena chinhu chinoshandiswa kushandura chiratidzo chemagetsi cheRF kuita electromagnetic radiation (EMR), kana kuti zvinopesana. Nezvimwe zvikamu nemaconductor tinoedza kuderedza mhedzisiro yeEMR, uye nemaantenna tinoedza kugadzirisa kugadzirwa kana kugamuchira kweEMR maererano nezvinodiwa neapplication.
Sainzi yeAntena haisi nyore zvachose. Zvinhu zvakasiyana-siyana zvinopesvedzera maitiro ekusarudza kana kugadzira antenna yakakodzera kushandiswa kwakati. AAC ine zvinyorwa zviviri (tinya pano uye pano) zvinopa sumo yakanaka kwazvo yepfungwa dzeantenna.
Mafrequency akakwira anoperekedzwa nematambudziko akasiyana-siyana ekugadzira, kunyange hazvo chikamu cheantenna chesystem chinogona kunge chisina matambudziko zvakanyanya sezvo mafrequency achiwedzera, nekuti mafrequency akakwira anobvumira kushandiswa kwemaantenna mapfupi. Mazuva ano zvakajairika kushandisa "chip antenna," iyo inosungirirwa kuPCB senge zvikamu zvepadenga, kana PCB antenna, iyo inogadzirwa nekuisa trace yakagadzirirwa muPCB layout.
Pfupiso
Zvimwe zvikamu zvinowanikwa chete mumashandisirwo eRF, uye zvimwe zvinofanirwa kusarudzwa uye kushandiswa nokungwarira nekuda kwemaitiro azvo asina kunaka e-high-frequency.
Zvikamu zvisingashande zvinoratidza mhinduro isina kunaka yefrequency nekuda kweparasitic inductance uye capacitance.
Mashandisirwo eRF anogona kuda makristaro akanyatsojeka uye/kana kuti akagadzikana kupfuura makristaro anowanzo shandiswa mumaseketi edhijitari.
MaAntenna zvinhu zvakakosha zvinofanirwa kusarudzwa zvichienderana nehunhu uye zvinodiwa zveRF system.
Si Chuan Keenlion Microwave ine sarudzo yakakura mu narrowband uye broadband configurations, inofukidza ma frequency kubva pa 0.5 kusvika 50 GHz. Yakagadzirwa kuti ikwanise kubata simba rekupinda rema watts gumi kusvika makumi matatu mu 50-ohm transmission system. Madhizaini e microstrip kana stripline anoshandiswa, uye akagadzirirwa kushanda zvakanaka.
Nguva yekutumira: Mbudzi-03-2022
