隨著個人通信和移動通信技術(shù)在世界范圍內(nèi)的迅猛發(fā)展,人們對移動通信的服務(wù)質(zhì)量要求也越來越高.WCDMA(Wideband Code Division Multiple Access)作為第三代移動通信系統(tǒng)的三大標(biāo)準(zhǔn)之一,因為具有優(yōu)良的通信質(zhì)量和較高的頻譜利用率而被廣泛應(yīng)用.在WCDMA接收機(jī)中,射頻前端電路占有重要的地位,其性能優(yōu)劣直按影響著接收機(jī)的接收靈敏度以及后繼信號處理部分的性能.因此,進(jìn)行WCDMA射頻電路的研究和設(shè)計具有重要的現(xiàn)實意義.天線和低噪聲放大器(LNA)是射頻(RF)接收機(jī)芯片的重要組成部分。本文在廣泛查閱國內(nèi)、外參考文獻(xiàn)的基礎(chǔ)上,對微帶天線的寬頻帶技術(shù)和LNA的設(shè)計原理進(jìn)行了深入地研究.綜合多種寬頻帶技術(shù),本文采用L形探針饋電與雙E形槽貼片相結(jié)合的方法,提出了一款適合于WCDMA基站的寬頻帶微帶天線結(jié)構(gòu)。利用電磁仿真軟件HFSS對該天線的性能進(jìn)行了研究,研究了天線貼片尺寸對天線性能的影響。在此基礎(chǔ)上,優(yōu)化設(shè)計了適用于WCDMA基站的寬頻帶微帶天線,并對其進(jìn)行了加工、測試和分析,仿真和測試結(jié)果均表明,該天線-10dB回波損耗帶寬為520MHz,天線在2GHz的增益為7.88dBi,滿足WCDMA基站的要求.另外,本文還根據(jù)WCDMA基站對LNA性能的要求,利用仿真軟件ADS(Advanced Design System)設(shè)計了一款高線性的兩級平衡低噪聲放大器,給出了電路原理圖,并制作了版圖,結(jié)果表明,該低噪聲放大器在1.92GH2~1.98GHz頻段增益不低于30dB,噪聲系數(shù)小于1dB,滿足WCDMA的要求,具有一定的實用價值。
上傳時間: 2022-06-20
上傳用戶:
0引言當(dāng)今國際上有影響的現(xiàn)場總線標(biāo)準(zhǔn)很多,眾多的現(xiàn)場總線標(biāo)準(zhǔn)給控制系統(tǒng)的集成帶來不便,使得各廠商生產(chǎn)的現(xiàn)場總線產(chǎn)品難以集成在一起,實現(xiàn)互可操作。在現(xiàn)場總線難以統(tǒng)一的情況下,以太網(wǎng)在工業(yè)自動化和過程控制領(lǐng)域獲得了迅速增長。當(dāng)前,不少廠商都為其生產(chǎn)的PLC及其遠(yuǎn)程1/0提供與以太網(wǎng)相連的接口和功能,提供把PLC和以太網(wǎng)相結(jié)合的產(chǎn)品,將基于TCP/IP協(xié)議開發(fā)的以太網(wǎng)與PLC控制器相結(jié)合,就可以構(gòu)筑全分散、全開放的工業(yè)控制系統(tǒng)。1局域網(wǎng)技術(shù)與以太網(wǎng)局域網(wǎng)分布距離短,具有短小靈活和結(jié)構(gòu)規(guī)整的特點,容易形成標(biāo)準(zhǔn),因此局域網(wǎng)技術(shù)是計算機(jī)網(wǎng)絡(luò)技術(shù)中最為標(biāo)準(zhǔn)化的一部分。國際電子電工工程師協(xié)會IEEE在70年代就制定了3個局域網(wǎng)標(biāo)準(zhǔn)IEEE802.3(CSMA/CD).IEEE802.4< 牌總S).ПEEE802.5(令牌).UkAtIEEE802.3(CS-MA/CD)的一個典型產(chǎn)品,即一般把符合IEEE802.3的特定實現(xiàn)稱為以太網(wǎng)。其中,CSMA/CD是Carrier Sense Multiple Access With Colli-sion Detection的縮寫,含有兩方面的內(nèi)容:載波偵聽(CSMA)和沖突檢測(CD),CSMA/CD訪問控制方式主要用于總線形和樹形網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu),基帶傳輸系統(tǒng)。信息傳輸是以“包”為單位,簡稱信包。
標(biāo)簽: plc 以太網(wǎng) 上位機(jī) 通信
上傳時間: 2022-06-23
上傳用戶:
#nclude<reg51.h>#include<intrins.h>#銷nclude<math.h>#include<string.h>struct PID{unsigned int SetPoint;//設(shè)定目標(biāo) Desired Value unsigned int Proportion;//比例常數(shù)Proportional Const unsigned int integral;//積分常數(shù)Integral Const unsigned int Derivative://微分常數(shù)Derivative Const unsigned int LastError;//Emorl-1]unsigned int PrevError;//Errorl-2]unsigned int SumError;//Sums of Errors struct PID spid;//PID Control Structure unsigned int rout;//PID Response(Output)unsigned int rin://PID Feedback(Input)sbit data1=P100;sbit clk=P141;sbit plus=P240;sbit subs=P241:sbit stop=P22;sbit output=P34;sbit DQ=P33;unsigned char flag,flag_1=0;unsigned char high_time,low_time,.count=0,/占空比調(diào)節(jié)參數(shù)unsigned char set_temper=35;unsigned char temper;unsigned chari:unsigned charj=0;unsigned ints;
上傳時間: 2022-07-02
上傳用戶:xsr1983
摘要:本系統(tǒng)以ICL8038集成塊為核心器件,制作一種函數(shù)信號發(fā)生器,制作成本較低。適合學(xué)生學(xué)習(xí)電子技術(shù)測量使用。ICL8038是一種具有多種波形輸出的精密振蕩集成電路,只需要個別的外部元件就能產(chǎn)生從0.001Hz~30KlHz的低失真正弦波、三角波、矩形波等脈沖信號。輸出波形的頻率和占空比還可以由電流或電阻控制。另外由于該芯片具有調(diào)制信號輸入端,所以可以用來對低頻信號進(jìn)行頻率調(diào)制。關(guān)鍵詞:函數(shù)信號發(fā)生器頻率調(diào)制Abstract:The system ICL8038 integrated block as the core device,producing a kind of function signal generator,producing low cost.Suitable for students to learn the use of electronic technology measurement.ICL8038 is a kind of multi-precision oscillator waveform output integrated circuits,a separate external components only need to be able to generate from the 0.001Hz ~30KHz low-distortion sine wave,triangle wave,square wave pulse signal,etc..Output waveform of the frequency and duty cycle can also be controlled by a currentor resistance.In addition,as the chip has a modulated signal input terminal,it can be used to low-frequency signal is frequency modulation.
標(biāo)簽: icl8038 函數(shù)發(fā)生器 電路
上傳時間: 2022-07-04
上傳用戶:zhanglei193
MT7688 family integrates a 1T1R 802.11n Wi-Fi radio,a 580MHz MIPS? 24KEcTM CPU,1-port fast Ethernet PHY, USB2.0 host, PCIe, SD-XC,I2S/PCM and multiple slow IOs. MT7688 provides two operation modes-IoT gateway mode and IoT device mode. In IoT gateway mode, the PCI Express interface can connect to 802.1lac chipset for 1lac dual-band concurrent gateway. The high performance USB2.0 allows MT7688 to add 3G/LTE modem support or add a H.264 ISP for wireless IP camera. For the IoT device mode, MT7688 supports eMC, SD-XC and USB 2.0. MT7688 can support the Wifi high quality audio via 192Kbps/24bits I2S interface and VolP application through PCM. In IoT device mode, it further supports PWM, SPI slave,3d UARI and more GPIOs. For IoT gateway, it canl connect to touch panel and BLE, Zigbee/Z-Wave and sub-1G RF for smart home control.
上傳時間: 2022-07-24
上傳用戶:
eeworm.com VIP專區(qū) 單片機(jī)源碼系列 67資源包含以下內(nèi)容:1. P89LPC912單片機(jī)數(shù)據(jù)手冊.pdf2. P89LPC932 Flash單片機(jī)使用指南.pdf3. PC MCU串行通信的應(yīng)用設(shè)計方法.pdf4. RSA加解密系統(tǒng)及其單芯片實現(xiàn).pdf5. PCF8563實時時鐘高精度調(diào)整方法.pdf6. PAM2862 1A LED Driver with Int.pdf7. AN070219 PCF8563中斷輸出功能.pdf8. SJA1000 Stand-alone CAN contro.pdf9. PCA82C250 PCA82C251 CAN Transc.pdf10. SJA1000獨立的CAN控制器應(yīng)用指南.pdf11. PCA82C250 CAN收發(fā)器應(yīng)用指南.pdf12. SCN2681 SCN68681和SCC2691數(shù)據(jù)通信.pdf13. Philips單片機(jī)P89V51RD2簡介.pdf14. 飛利浦SC16C器件和飛利浦低功耗SC16CxxxB器件之間.pdf15. P89V51RD2單片機(jī)看門狗的使用方法.pdf16. SC16C554 SC16C654 SC16C554B SC.pdf17. P89V51RD2的加密操作.pdf18. SC16C550應(yīng)用實例.pdf19. 如何在C語言中調(diào)用P89V51RD2的IAP功能.pdf20. P89LPC901實現(xiàn)ADC DAC及UART通信.pdf21. P89LPC900在高精度模數(shù)轉(zhuǎn)換場合的應(yīng)用.pdf22. P89C51Rx2xx硬件進(jìn)入ISP的方法.pdf23. Study-3 51單片機(jī)開發(fā)板原理圖.pdf24. 基于P87LPC760的DALI從機(jī).pdf25. PCA9515D PCA9515DP I2C中繼器.pdf26. PCA9534 8bit I2C bus and SMBus low power IO port with interru.pdf27. LPC900 Flash單片機(jī)鍵盤中斷.pdf28. PCA9516 5channel I2C hub.pdf29. PCA9535 PCA9535C 16bit I2C bus.pdf30. LPC700系列單片機(jī)看門狗復(fù)位應(yīng)注意的問題.pdf31. PCA9516 I2C中繼器.pdf32. PCA9536 4bit I2C bus and SMBus.pdf33. 內(nèi)置Reset WDT電路的串行E2PROM原理及應(yīng)用設(shè)計.pdf34. PCA9517 Level translating I2C-.pdf35. PCA9537 4bit I2C bus and SMBus.pdf36. X-tal oscillators on 8-bit mic.pdf37. PCA9517低電壓I2C總線中繼器.pdf38. PCA9538 8bit I2C bus and SMBus.pdf39. 8051系列單片機(jī)應(yīng)用系統(tǒng)的PROTEUS仿真設(shè)計.doc40. PCA9518 Expandable 5channel I2.pdf41. PCA9539 PCA9539R 16-bit I2C-bu.pdf42. 基于單總線技術(shù)蓄電池監(jiān)控系統(tǒng)設(shè)計.pdf43. PCA9518A I2C 中繼器集線器與擴(kuò)展器.pdf44. PCA9540B 2channel I2C bus mult.pdf45. 基于AT89C51應(yīng)用系統(tǒng)的串行通信設(shè)計.pdf46. PCA9519 4channel level transla.pdf47. PCA9541 2 to 1 I2C-bus master.pdf48. PCA9519 4通道I2C-bus SMBus 中繼器.pdf49. PCA9544A 4channel I2C multiple.pdf50. PCA9542A 2channel I2C bus mult.pdf51. PCA9544A I2C多路復(fù)用器.pdf52. PCA9544中文資料.pdf53. PCA9549 Octal bus switch with.pdf54. PCA9545A/PCA9545B/PCA9545C I2C.pdf55. PCA9549D/PCA9549PW/PCA9549B I2.pdf56. PCA9546A 4 channel I2C bus swi.pdf57. PCA9555 16bit I2C-bus and SMBu.pdf58. PCA9546A I2C多路復(fù)用器和開關(guān).pdf59. PCA9670 Remote 8-bit IO expand.pdf60. PCA9547 8 channel I2C bus mult.pdf61. PCA9671 Remote 16-bit IO expan.pdf62. PCA9547D/PW/BS I2C多路復(fù)用器和開關(guān).pdf63. PCA9672 Remote 8-bit IO expand.pdf64. PCA9548中文資料.pdf65. PCA9673 Remote 16-bit IO expan.pdf66. PCA9548A 8 channel I2C bus swi.pdf67. PCA9674 PCA9674A Remote 8-bit.pdf68. PCA9548AB I2C多路復(fù)用器和開關(guān).pdf69. 8-bit I2C-bus and SMBus IO port with reset.pdf70. PCA9698芯片的應(yīng)用.pdf71. PCA9698 I2C擴(kuò)展芯片.pdf72. PCF2123的中斷輸出功能.pdf73. TI新推29款Cortex-M3內(nèi)核Stelleris AR.pdf74. 端口RS-232工業(yè)PC104多串口卡.pdf75. TIPC1000帶視頻輸入接口的嵌入式觸摸平板電腦.pdf76. 串口調(diào)試助手用戶手冊.pdf77. PCM8416AS自動校準(zhǔn)功能智能型PC104高分辨率多功能.pdf78. TJA1042高速CAN 收發(fā)器.pdf79. COS-II調(diào)試插件.pdf80. PROFIBUS技術(shù)和應(yīng)用.pdf81. TJA1042 High-speed CAN transce.pdf82. TKStudio IDE集成開發(fā)環(huán)境升級記錄.pdf83. Replacement of NXP PCA9518 wit.pdf84. TJA1051高速CAN 收發(fā)器.pdf85. 1A SIMPLE STEP-DOWN SWITCHING.pdf86. RSM232隔離RS-232收發(fā)器.pdf87. TJA1051 High-speed CAN transce.pdf88. DUAL RS-232 DRIVER RECEIVER WI.pdf89. RSM-4055 8通道隔離數(shù)字量輸入輸出模塊.pdf90. 外部工具用戶手冊.pdf91. XGate COP10 CANopen 嵌入式通信模塊.pdf92. RSM-6505 5通道熱電偶測量模塊.pdf93. 十六進(jìn)制編輯器.pdf94. ZigBee模塊ZICM2410應(yīng)用開發(fā)指南.pdf95. RSM-65055通道熱電偶測溫模塊.pdf96. 圖片字模助手.pdf97. ZY00xxGD-10W交直流兩用全電壓輸入AC-DC電源模.pdf98. TKStudio下SDCC_8051用戶使用手冊.pdf99. 定壓輸出隔離穩(wěn)壓單輸出系列.pdf100. ZY00xxGD-15W交直流兩用全電壓輸入AC-DC電源模.pdf
標(biāo)簽: 電子技術(shù)基礎(chǔ) 模擬電子技術(shù) 電子教案
上傳時間: 2013-04-15
上傳用戶:eeworm
The ISL8540 is a step down DC/DC power switching regulator which accepts 9.0V to 40V input and provi
標(biāo)簽: Switching Regulator Power DC
上傳時間: 2013-06-07
上傳用戶:shanml
These BCD-to-decimal decoders/drivers consist of eightinverters and ten, four-input NAND gate
標(biāo)簽: 74145 TTL BCD 十進(jìn)制
上傳時間: 2013-07-31
上傳用戶:1047385479
實現(xiàn)實時語音的錄入以及與RS232串口完美結(jié)合-Real-time voice input and the perfect combination with the RS232 serial port
上傳時間: 2013-05-16
上傳用戶:大三三
General Description The LM621 is a bipolar IC designed for commutation of brushless DC motors. The part is compatible with both three- and four-phase motors. It can directly drive the power switching devices used to drive the motor. The LM621 provides an adjustable dead-time circuit to eliminate ``shootthrough'' current spiking in the power switching circuitry. Operation is from a 5V supply, but output swings of up to 40V are accommodated. The part is packaged in an 18-pin, dual-in-line package.
上傳時間: 2013-07-24
上傳用戶:sdq_123
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