S801T18N3S
S801T18N3S
S801T18N3S
《聯(lián)系人；歐先生》
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隨著閱讀器與標(biāo)簽價(jià)格的降低和全球市場的擴(kuò)大，射頻標(biāo)識(shí)RFID(以下簡稱RFID)的應(yīng)用與日俱增。標(biāo)簽既可由閱讀器供電(無源標(biāo)簽)，也可以由標(biāo)簽的板上電源供電(半有源標(biāo)簽和有源標(biāo)簽)。由于亞微型無源CMOS標(biāo)簽的成本降低，庫存和其他應(yīng)用迅速增加。一些評(píng)估表明，隨著無源標(biāo)簽的價(jià)格持續(xù)下降，幾乎每一個(gè)售出產(chǎn)品的內(nèi)部都將有一個(gè)RFID標(biāo)簽。由于無源RFID標(biāo)簽的重要性及其獨(dú)特的工程實(shí)現(xiàn)的挑戰(zhàn)性，本文將重點(diǎn)研究無源標(biāo)簽系統(tǒng)。
當(dāng)接收到來自閱讀器的CW信號(hào)時(shí)，無源標(biāo)簽對(duì)射頻RF(以下簡稱RF)能量進(jìn)行整流以生成保持標(biāo)簽工作所需的小部分能量，然后改變其天線的吸收特點(diǎn)以調(diào)制信號(hào)，并通過反向散射反射給閱讀器。RFID系統(tǒng)通常使用簡便的調(diào)制技術(shù)和編碼體制。然而，簡單調(diào)制技術(shù)的頻譜效率低，對(duì)于某一給定的數(shù)據(jù)速率，它所要求的RF帶寬多。
在調(diào)制前，必須將數(shù)據(jù)進(jìn)行編碼形成一連續(xù)的信息流�？捎玫奈痪幋a體制有很多類型，每一類編碼都有其基帶頻譜性能的獨(dú)特優(yōu)勢、編解碼的復(fù)雜性以及在時(shí)鐘驅(qū)動(dòng)下將數(shù)據(jù)寫入到存儲(chǔ)器的困難性。由于標(biāo)簽板上定時(shí)源很難達(dá)到實(shí)際所需的準(zhǔn)確性，以及挑戰(zhàn)性的帶寬要求和最大化RF能量傳輸以向標(biāo)簽供應(yīng)能量等原因，無源標(biāo)簽對(duì)所使用的編碼體制有獨(dú)特的要求。最后，需要某種防沖突協(xié)議以便閱讀器能夠讀取其覆蓋范圍內(nèi)的所有標(biāo)簽。
RFID測試綜述
每一個(gè)RFID通信系統(tǒng)都必須通過監(jiān)管要求并符合所用標(biāo)準(zhǔn)。然而，今天，系統(tǒng)優(yōu)化將這個(gè)快速增長產(chǎn)業(yè)中的勝者與輸者分離開來。本文討論的是RFID通信系統(tǒng)的設(shè)計(jì)師所面對(duì)的測試挑戰(zhàn)：監(jiān)管測試、標(biāo)準(zhǔn)一致性和優(yōu)化。
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7 Applied Materials Ball Bearings Clean Room 3060-01183
Applied Materials Capacitance Pirani Gauge CDG / Pi
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Applied Materials 0200-10191 Common Silane Shield
Applied Materials 50' Cable FUPS to AC Rack 0150-08876
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New Applied Materials Convectron Control Cable Assembly
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Applied Materials QUANTUM LEAP II PROCESS MODULE
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Applied Materials Centura TTF Connection Kit 0242-7537
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NEW - APPLIED MATERIALS DIO LOADING BOARD 200113D01
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Applied Materials Servo control module SOL-00060-M-124?4
Applied Materials Turbo Pump Cable Assy 0150-36038 NEW
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New Applied Materials 300 mm Wafer EPI Ring 0200-35081
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