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CML 公司的CMX994是 100-600MHz直接變換接收器，集成了高動(dòng)態(tài)范圍I/Q解調(diào)器控制增益的寬帶LNA，接收器基帶部分包括放大器和精密的基帶濾波器，整數(shù)N PLL和VCO負(fù)阻放大器產(chǎn)生本地振蕩（LO），工作電壓3.3V，主要用在模擬/數(shù)字多模式無(wú)線電，SDR，數(shù)據(jù)遙測(cè)調(diào)制解調(diào)器，衛(wèi)星通信，笛卡爾反饋回路發(fā)送器，寬帶數(shù)據(jù)等。本文介紹了CMX994主要特性，方框圖，典型應(yīng)用框圖和EV9942評(píng)估板主要特性與功能，電路圖以及PCB布局圖。 The CMX994 is a direct conversion receiver IC. It includes a broadband LNA with gain control followed by a high dynamic range I/Q demodulator. The receiver baseband section includes amplifiers and precise baseband filter stages. LO generation is provided by an integer-N PLL and a VCO negative resistance amplifier; an external LO may also be used. LO dividers are provided for flexible multi-band operation. The device operates from a single 3.3V supply over a temperature range of –40℃ to +85℃ and is available in a small 40-pin VQFN (Q4) package. CMX994主要特性： Rx Direct Conversion Receiver o Direct conversion eliminates image responses o LNA with gain control o 100MHz to 600MHz I/Q demodulator o Precise filtering with bandwidth setting and 1:2:4 bandwidth modes Local Oscillator o LO synthesiser o VCO negative resistance amplifier o LO divide by 2, 4 or 6 modes o Tx LO Output 3.3V Low-power Operation Small size 40-pin VQFN Package Low-power Mode CMX994應(yīng)用： Analogue/digital multimode radio Software Defined Radio (SDR) Data telemetry modems Satellite communications Constant envelope and linear Rx modulation Rx function compatible with CMX998 Cartesian Feedback Loop Transmitter Narrowband: e.g. 25kHz, 12.5kHz, 6.25kHz Wideband Data 
圖1。CMX994方框圖
圖2。CMX994典型應(yīng)用框圖 EV9942評(píng)估板 The EV9942 allows the user to investigate all aspects of the CMX994 integrated circuit, which implements a high-performance direct conversion receiver. The evaluation kit also includes additional circuits that may be used to evaluate system performance, a Fractional-N PLL and a high-frequency VCO. Access is provided to all CMX994 RF, baseband and control signals by either connector or test points. Test access points are available to accept common test equipments, such as RF and baseband signal generators and spectrum analysers. All signal paths are matched by suitable components. The overall frequency range of this evaluation kit is for RF frequencies between 100MHz and 600MHz, with default operation at 448MHz. The CMX994 is controlled via its C-BUS serial interface. The PE0002 Interface Card is available separately to support PC-based control of the EV9942. The PE0002 uses ES9942xx.exe PC software, part of the ES9942xx.zip file, which is available from the CML website. EV9942評(píng)估板主要特性： CMX994 Evaluation Receiver: o LNA o I/Q Output o Selectable Filters Transmit LO Output CMX994 Integer-N PLL Interface for external Fractional-N PLL 19.2MHz VCTCXO Flexible External VCO On-board Voltage Regulators PC Control Interface Available Interfaces to PE0601, EV9810 or EV9100 Evaluation Kits 448MHz Default Operation 100MHz to 600MHz Evaluation
圖3。EV9942評(píng)估板外形圖
圖4。EV9942評(píng)估板方框圖 EV9942評(píng)估板功能： The EV9942 functionality includes: Demonstration of a linear direct conversion receiver from RF input to output in I/Q format including: o LNA with gain control o I/Q mixers o first baseband filters o first baseband amplifiers o second baseband filters o second baseband amplifiers. VCO, Integer-N PLL and divider. Tx LO Output. Operation 100MHz to 600MHz (448MHz = default configuration). 19.2MHz VCTCXO. On-board linear regulators for all necessary power rails. The C-BUS Interface that allows the card to be connected to a host μController. A PC Interface board is separately available and allows control of all device functions, to support initial test and customer evaluation. Interface to CMX7163 or CMX7164 evaluation boards (PE0601-7163 / PE0601-7164, not included) to allow demonstration/test of QAM and 2-FSK / 4-FSK demodulation. Interface to CMX910 evaluation card (EV9100, not included) to allow demonstration/test with GMSK demodulation. Interface to CMX981 evaluation card (EV9810, not included) allows demonstration of: o Linear receiver o Pi/4-DQPSK In summary, the EV9942 allows the user to create experiments to investigate all aspects of the CMX994 device. The EV9942 is designed to allow user modification, to support the detailed investigation of the user’s specific and different applications. The evaluation platform also includes additional circuits that may be used to evaluate system performance, for example a fractional-N PLL (U8) and a high-frequency VCO (TR2/TR3).
圖5。EV9942評(píng)估板電路圖（1）
圖6。EV9942評(píng)估板電路圖（2）
圖7。EV9942評(píng)估板電路圖（4）
圖8。EV9942評(píng)估板電路圖（4）
圖9。EV9942評(píng)估板PCB布局圖：頂層
圖10。EV9942評(píng)估板PCB布局圖：底層 詳情請(qǐng)見(jiàn)： 
CMX994ds[1].pdf
(1.32 MB)
ev9942ds[1].pdf
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CMX994：100MHz－600MHz直接變換接收解決方案 CML 公司的CMX994是 100Mhz~-600MHz直接變換接收器，集成了高動(dòng)態(tài)范圍I/Q解調(diào)器控制增益的寬帶LNA，接收器基帶部分包括放大器和精密的基帶濾波器，整數(shù)N PLL和VCO負(fù)阻放大器產(chǎn)生本地振蕩（LO），工作電壓3.3V，主要用在模擬/數(shù)字多模式無(wú)線電、SDR、數(shù)據(jù)遙測(cè)調(diào)制解調(diào)器、衛(wèi)星通信、笛卡爾反饋回路發(fā)送器、寬帶數(shù)據(jù)等。 該器件為單一的3.3V電源，溫度范圍為-40℃~+85℃，為小型的40引腳VQFN（第四季）封裝。
圖1 CMX994方框圖
圖2 CMX994典型應(yīng)用框圖 CMX994主要特性 • RX直接轉(zhuǎn)換接收器 –直接轉(zhuǎn)換消除了圖像反應(yīng) – LNA增益控制 –100MHz~600MHz的I / Q解調(diào) –精密過(guò)濾帶，寬設(shè)置和本地振蕩器1:2:4帶寬模式 – LO合成器 –振蕩器負(fù)阻放大器 • LO分割為2，4或6種模式 – TX LO輸出 • 3.3V低功耗運(yùn)行 •小尺寸40引腳VQFN封裝 •低功耗模式 CMX994應(yīng)用 •模擬/數(shù)字多模無(wú)線電 •軟件無(wú)線電（SDR） •數(shù)據(jù)遙測(cè)調(diào)制解調(diào)器 •衛(wèi)星通信 •恒包絡(luò)線性接收調(diào)制 •接收功能與CMX998兼容 •笛卡兒反饋回路變送器 •窄帶：例如為25kHz，12.5kHz，6.25kHz •寬帶數(shù)據(jù) EV9942評(píng)估板 EV9942可以使用戶審查CMX994集成電路的所有方面，從而實(shí)現(xiàn)高性能的直接轉(zhuǎn)換接收器。該評(píng)估板還包括額外的電路（可用于評(píng)估系統(tǒng)性能）和一個(gè)小數(shù)N PLL，以及一個(gè)高頻VCO。 通過(guò)連接器或測(cè)試點(diǎn)，可以進(jìn)入所有的CMX994 RF，基帶和控制信號(hào)。 EV9942還具有測(cè)試接入點(diǎn)，以接入共同測(cè)試設(shè)備，如射頻和基帶信號(hào)發(fā)生器和頻譜分析儀。所有的信號(hào)路徑匹配合適的組件。此評(píng)估板的整體頻率范圍為RF頻率，100MHz~600MHz，在448MHz為默認(rèn)操作。 CMX994是通過(guò)其C-BUS串行接口進(jìn)行控制。 PE0002的接口卡可以單獨(dú)使用，以為基于PC控制的EV9942提供支持。
圖3 EV9942評(píng)估板方框圖 EV9942評(píng)估板主要特性 • CMX994評(píng)估接收機(jī) –低噪聲放大器 – I/ Q輸出 –可選過(guò)濾器 •發(fā)送LO輸出 • CMX994整數(shù)N PLL •外部分?jǐn)?shù)N PLL接口 •19.2MHz VCTCXO •靈活的外部VCO •板上穩(wěn)壓器 • PC控制接口 • PE0601，EV9810接口 •或EV9100評(píng)估套件 • 448MHz默認(rèn)操作 • 100MHz~600MHz評(píng)估 EV9942評(píng)估板功能 •線性直接轉(zhuǎn)換接收器示范，從RF輸 入至輸出，I / Q格式，包括： – LNA增益控制 – I/ Q混頻器 –第一基帶濾波器 –第一基帶放大器 –第二次基帶濾波器 –第二次基帶放大器 • VCO整數(shù)N鎖相環(huán)和分頻器 • TX LO輸出。 •操作為100MHz到600MHz （448MHz=默認(rèn)配置） • 19.2MHz VCTCXO •所有必要的電源軌板上線性穩(wěn)壓器 總之，EV9942可以使用戶創(chuàng)建實(shí)驗(yàn)，以審查CMX994設(shè)備的所有方面。 EV9942允許用戶修改，以支持用戶詳細(xì)調(diào)查具體和不同的應(yīng)用程序。該評(píng)估平臺(tái)還包括額外的電路，可用于評(píng)估系統(tǒng)的性能，例如小數(shù)N PLL（U8）和高頻率VCO（TR2/TR3）。 |
