| 緯亞電子 | SMT專業(yè)貼片加工為您提供最適合的解決方案 |
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1)小功率的RF的PCB設(shè)計中,主要使用標準 的FR4材料(絕緣特性好、材質(zhì)均勻、介電常數(shù)ε=4,10%)。主要使用4層~6層板,在成本非常敏感的情況下可以使用厚度在1mm以下的雙面板,要保 證反面是一個完整的地層,同時由于雙面板的厚度在1mm以上,使得地層和信號層之間的FR4介質(zhì)較厚,為了使得RF信號線阻抗達到50歐,往往信號走線的 寬度在2mm左右,使得板子的空間分布很難控制。對于四層板,一般情況下頂層只走RF信號線,二層是完整的地,三層是電源,底層一般走控制RF器件狀 態(tài)的數(shù)字信號線(比如設(shè)定ADF4360系列PLL的clk、data、LE信號線。)三層的電源好不要做成一個連續(xù)的平面,而是讓各個RF器件的電 源走線呈星型分布,后接于一點。三層RF器件的電源走線不要和底層的數(shù)字線有交叉。
2)對于一個混合信號的PCB,RF部分和模擬 部分應(yīng)當遠離數(shù)字數(shù)字部分(這個距離通常在2cm以上,至少保證1cm),數(shù)字部分的接地應(yīng)當與RF部分分隔開。嚴禁使用開關(guān)電源直接給RF部分供電。主 要在于開關(guān)電源的紋波會將RF部分的信號調(diào)制。這種調(diào)制往往會嚴重破壞射頻信號,導致致命的結(jié)果。通常情況下,對于開關(guān)電源的輸出,可以經(jīng)過大的扼流圈, 以及π濾波器,再經(jīng)過線性穩(wěn)壓的低噪音LDO(Micrel的MIC5207、MIC5265系列,對于高電壓,大功率的RF電路,可以考慮使用 LM1085、LM1083等)得到供給RF電路的電源。
3)RF的PCB中,各個元件應(yīng)當緊密的排布, 確保各個元件之間的連線短。對于ADF4360-7的電路,在pin-9、pin-10引腳上的VCO電感與ADF4360芯片間的距離要盡可能的短, 保證電感與芯片間的連線帶來的分布串聯(lián)電感小。對于板子上的各個RF器件的地(GND)引腳,包括電阻、電容、電感與地(GND)相接的引腳,應(yīng)當在離 引腳盡可能近的地方打過孔與地層(二層)連通。
4)在選擇在高頻環(huán)境下工作元器件時,盡可能使 用表貼器件。這是因為表貼元件一般體積小,元件的引腳很短。這樣可以盡可能減少元件引腳和元件內(nèi)部走線帶來的附加參數(shù)的影響。尤其是分立的電阻、電容、電 感元件,使用較小的封裝(0603/0402)對提高電路的穩(wěn)定性、一致性是非常有幫助的;
5)在高頻環(huán)境下工作的有源器件,往往有一個以 上的電源引腳,這個時候一定要注意在每個電源的引腳附近(1mm左右)設(shè)置單獨的去偶電容,容值在100nF左右。在電路板空間允許的情況下,建議每個引 腳使用兩個去偶電容,容值分別為1nF和100nF。一般使用材質(zhì)為X5R或者X7R的陶瓷電容。對于同一個RF有源器件,不同的電源引腳可能為這個器件 (芯片)中不同的官能部分供電,而芯片中的各個官能部分可能工作在不同的頻率上。比如ADF4360有三個電源引腳,分別為片內(nèi)的VCO、PFD以及數(shù)字 部分供電。這三個部分實現(xiàn)了完全不同的功能,工作頻率也不一樣。一旦數(shù)字部分低頻率的噪音通過電源走線傳到了VCO部分,那么VCO輸出頻率則可能被這個 噪音調(diào)制,出現(xiàn)難以消除的雜散。為了防止這樣的情況出現(xiàn),在有源RF器件的每個官能部分的供電引腳除了使用單獨的去偶電容外,還必須經(jīng)過一個電感磁珠 (10uH左右)再連到一起。這種設(shè)計對于那些包含了LO緩沖放大和RF緩沖放大的有源混頻器LO-RF、LO-IF的隔離性能的提升是非常有利的。
6)對 于PCB上RF信號的饋入、饋出,一定要使用專門的RF同軸連接器。其中為常用的是SMA型的連接器。對于SMA的連接器而言,又分為直插式的和微帶式 的。對于頻率在3GHz以下的信號,而且信號的功率不大,并且我們不計較微弱的插損,則完全可以使用直插式的SMA連接器。如果信號的頻率進一步提高,則 我們需要慎重選擇RF連接線材以及RF的連接器。此時直插式的SMA連接器由于其結(jié)構(gòu)(主要是拐彎)可能會導致比較大的信號插損。此時可以使用質(zhì)量較好 (關(guān)鍵在于連接器所使用了PTFE絕緣子材料)的微帶SMA連接器來解決問題。同樣如果你的頻率不高,但是苛求插損、功率等方面的指標,同樣可以考慮微帶 SMA連接器。另外小型的RF連接器還有SMB、SMC等型號,對于SMB連接器而言,一般這一類連接器只支持2GHz以下的信號傳輸,而且SMB連接器 采用的卡扣結(jié)構(gòu)在高振動場合會出現(xiàn)“閃斷”的情況。所以在選擇SMB連接器時要慎重考慮。多數(shù)的RF連接器都有500次插拔限制,插拔過于頻繁可能永久損 壞連接器,所以在調(diào)試RF電路的時候就不要把RF連接器當螺絲擰著玩了。由于SMB的PCB座的部分是針式結(jié)構(gòu)(公),所以頻繁插拔對焊在PCB一端的連 接器損耗相對較小,降低了維修的難度,所以在這樣的情況下SMB連接器也是一種不錯的選擇。另外對于那些對空間要求極高的場合,還有GDR一類的微型連接 器供選擇。對于那些阻抗即便不是50歐、低頻率、小信號、精密直流等模擬信號或者數(shù)字部分的高頻時鐘、低抖動時鐘、高速串行信號等數(shù)字信號都可以使用 SMA作為饋出饋入的連接器。
7)在設(shè)計RF PCB的時候,對于RF信號的走線的寬度是有嚴格的規(guī)定的。設(shè)計的時候要根據(jù)PCB的厚度和介電常數(shù)需要嚴格計算、仿真走線在對應(yīng)的頻點上的阻抗,以確保 其為50歐(CATV的標準為75歐)。然而,并不是時時刻刻我們都需要嚴格的阻抗匹配,在某些情況下,較小的阻抗失配可能無關(guān)大礙(比如40歐~60 歐);而且,即便你對板子的仿真是基于理想情況下做的,實際交給PCB廠生產(chǎn)的時候,廠商所使用的工藝會導致板子的實際阻抗和仿真結(jié)果相差千里。所以對于小信號RF PCB的阻抗匹配這樣的問題,我的建議是:Step-1: 和PCB廠適當溝通,獲得對應(yīng)厚度、對用層數(shù)的板子50歐走線的寬度范圍;Step-2: 在這個寬度范圍內(nèi)選擇一個合適的寬度統(tǒng)一應(yīng)用在所有50歐的RF信號線上;Step-3: 在PCB 交付生產(chǎn)的時候,在Script上注明所有這個寬度的線做50歐阻抗匹配。此時就不需要加勒比特中文字幕在线观看,东北老女人高潮大叫对白,欧美在线视频分类丝袜,色午夜色aV手机在线,2023最新国产原创青草,2021最新国产高清视频
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