Mu gawo laposachedwa la ukadaulo wamagetsi, kusintha kosalekeza kwa chip Inth kwapangitsa kukhala kwachibadwa kuphatikiza njira imodzi kapena zingapo wailesi yailesi pa kapikidwe kakang'ono.Kupita kwaukadaulo kumeneku kwadzetsa zojambulajambula, makamaka kukhazikitsidwa kwa zero-ngati ndi zomanga-zotsika.Zomangazi zimayalidwa chifukwa chophweka komanso kuchotsa kwa kufunika kwa zosowa zakunja za wolandila wapamwamba kwambiri.Komabe, ngakhale gawo la rf limakhala losavuta, kambuku ka digita ya digito imakhala yovuta kwambiri komanso yofunika.Izi zikubweretsa funso loyambirira: Zomwe sizinthu zabwino zomwe zidatsimikizika pazida zenizeni zimakhudza machitidwe a RF?
Chinthu choyamba chomwe tikuyenera kuyang'ana pa phokoso lamafuta ndi phokoso laphokoso.Chipangizo chilichonse cha zamagetsi zenizeni chimapanga phokoso losasinthika chifukwa cha kusuntha mwachisawawa kwa ma elekitoni, ndiye kuti, phokoso lotentha.Mwachitsanzo, munthu wosauka yemwe ali pa kutentha T apanga maphokoso a phokoso.Ngati katundu wa munthu wotsutsayu amadziwika kuti ndi wolingana yekha, mphamvu yamagetsi yolumikizira katunduyo nthawi zambiri imafotokozedwa ngati kTB.Popanda kulingalira za dongosolo la Bandwidth, ngati kutentha T ndi 290k, ndiye kuti mwanzeru kudziwika -174dbm / hz.Nthawi yomweyo, phokoso lakhungu (1 / f noise) mu zida zogwirizira sizinganyalanyazidwe.Chifukwa ili pafupi ndi Decent Pay
Kuganizira motsatira ndi phokoso la gawo la oscillator (lo).Kutulutsa kwa oscillator pansi pa mikhalidwe yabwino kumatha kuyimitsidwa ndi plasta kugwira ntchito mu madera a pafupipafupi, koma munthawi yeniyeni ya phokoso nthawi zambiri kumayambitsa siketi m'magazini.Zovuta za gawo ili pa transceiver imawonetsedwa mu magawo awiri: Choyamba, kuwonjezeka kwa phokoso lazithunzi zomwe zimayambitsidwa ndi kuchulukitsa kwa gulu la oscillator ndi chizindikiro;Chachiwiri, phokoso lazikulu lomwe limayambitsidwa ndi kusakaniza kwa chizindikirocho komanso phokoso la oscillator.Phokoso limachuluka, lomwe limadziwika kuti kusakanikirana kosakanikirana.
Kuphatikiza apo, Jiterng Shiter ndi chinthu chofunikira.Analog-to-digito otembenukira (ADC) ndi otembenukira digital-to -nalog (madambala) a Analog (Dacs)Pakusintha pakati pa mitundu iwiriyi, yotchi ya Sampling, yomwe ili yodziwika bwino.Popeza chizindikiro chodziwika bwino choschillation chidzabala phokoso la gawo, zomwe zimawoneka ngati jterter mu nthawi yotsatira, zomwe zimatsogolera zolakwika ndi phokoso.
Zinthu zotsatila zowoneka ndi zonyamula ma frequesert frequet (CFO) ndi kuwongolera pafupipafupi (SFO).Panjira yolumikizirana, pafupipafupi pafupipafupi nthawi zambiri zimapangidwa ndi chotsekedwa.Komabe, chifukwa chosiyana pang'ono mu pafupipafupi kwa chonyamula (TX) ndi wolandila (RX), pafupipafupi pambuyo potembenuka kwa wolandirayo amakhala ndi cholakwika chotsalira cha pafupipafupi, ndiye kuti, onyamula zonyamula (CFO).Nthawi yomweyo, pakhoza kukhalanso kusiyana mu pafupipafupi kwa ADC ndi Dac, omwe amatchedwa Stupling pafupipafupi (SFO), zomwe zingakhale ndi vuto pa dongosolo.
Mukamaganizira za magwiridwe antchito a RF, wina ayeneranso kudziwa phokoso la kuchuluka kwa ma dac ndi madc.Mukamagwiritsa ntchito chinsinsi cha analog, zida izi zimapanga phokoso lambiri, zomwe zimapangitsa kuti phokoso likhale locheperako (SNR).Chifukwa chake, popanga wolandila, nthawi zambiri pamafunika phindu mu madc kutsogolo kuti awonetsetse kuti phokoso la ADC lokhalo ndi lokwanira kuti lisanyalanyazeMapeto a masitepe).Mphamvu ya Adc ya ADC idzachepetsa kuchuluka kwa mphamvu yayikulu (popr) ya chizindikiro, motero kuwononga sngy ya chizindikiro.
Pomaliza, pali mawonekedwe a fideretion ndi mankhwala osagwirizana nawo.Pa nthawi yokweza kapena kusasamala kwamphamvu, wosakanizira wosakanizidwa ndi gawo la gawo la ind ndi q, zomwe zingakhudze phokoso la signal kapena seti.Zomwe sizimachitika, makamaka zomwe sizikugwirizana ndi wolandirayo, zimayang'anira kusokoneza chizindikiro chachikulu, chomwe ndi chomwe timakonda kutchula chitetezo chosowa.Zinthu izi zomwe zimayang'ana mokwanira magwiridwe antchito a RF, ndipo ndikofunikira kuti akatswiri azaukadaulo amvetsetse ndi kudziwa zinthu izi kuti apange zisankho zoyenera mukamapanga dongosolo la RF.