In front of the a / d converter in an analog conversion system is usually located a sample - and - hold circuit 在模擬量轉換系統中在模/數轉換器的前端通常都會有一個采樣-保持電路。
( 4 ) design an output board to process the result data , transfer digital data out and realize digital to analog conversion . ( 5 ) debug and improve on the system hardware ( 4 )以一片adsp21160m和一片ep1k100qc208為核心,設計輸出板電路,完成數據對齊、求模和數據向下一級的輸出,并產生模擬輸出。
For the purpose of testing the function of extended ports , digital - to - analog conversion and analog - to - digital conversion , an auxiliary experiment board is made , it includes analog signal outputs , switch signal outputs , led circuit , eight - segment nixie tubes and a digital - to - analog conversion circuit 為了驗證擴展口、 a d轉換和d a功能,還自己制作一個包括8路模擬量輸入、開關量輸入、 8路led 、 4個數碼管和d a轉換電路輔助電路板。
In this thesis , firstly , the main protocols and their functions , the application profiles of bluetooth technology are introduced . the hci protocol is analysized emphasesly ; secondly , the 4 - channel 10v analog to digital conversion ( a / d ) bluetooth adapter , 4 - channel 10v digital to analog conversion ( d / a ) bluetooth adapter , rs232 serial port bluetooth adapter are developed . the hardware and software of them are realized and test ; thirdly , the test tool software for bluetooth adapter is designed . the displaying and saving of data with vc + + 6 . 0 multithread in pc is completed , then the wireless serial port communication between pc and micro - controller unit ( mcu ) is implemented , the data results of those adapters are acceeded ; finally , the bit - error - rate testing software of bluetooth communication system is designed , and the bit - error - rate test results of bluetooth adapter in labortary are acquired and illustrated also 其次提出了硬件設計方案:四通道10v模擬/數字( a / d )藍牙適配器、四通道10v數字/模擬( d / a )藍牙適配器, rs232串口通信藍牙適配器。在此基礎上完成了硬件電路和軟件程序的設計和調試。再次,設計了藍牙適配器測試工具軟件,在pc機上用vc6 . 0 + +多線程編程完成對傳輸數據的保存與顯示,實現了pc機與單片機的串口無線通信,并給出了藍牙適配器測試結果。
Tms320c5402dsp was used in the design to replace six scm those was used in the automatic biochemical analyzer now and to control system , cpld epm7128 offer logic circuit to the system . a 16 - bits high - speed a / d conversion device a / d976a replaced a / d574 to complete digital - analog conversion 本系統設計中采用一片高性能的dsp (數字信號處理器) tms320c5402代替了目前生產的全自動生化分析儀的六個單片機完成系統控制,用可編程邏輯器件epm7128提供所需的邏輯信號,采用16位高速a d轉換器ad976a取代以往的ad574完成模數轉換。
The thesis includes the design of hard circuit , pcb ( printed circuit board ) , driver and application soft involving a / d board and d / a board . the detailed functional modules consist of multiplex signals select module 、 analog digital conversion module 、 digital analog conversion module 、 pci protocol conversion module 、 driver and magnifying module 、 control logic 、 clock circuit and configuration circuit . the importance of the thesis is a / d board 本課題包括硬件電路、印刷電路板( pcb ) 、驅動程序和應用軟件的設計,涉及a / d板和d / a板兩大塊部分,具體的功能模塊包括多路信號選擇模塊、模數轉換模塊、數模轉換模塊、 pci協議轉換模塊、驅動放大模塊、控制邏輯、時鐘電路和配置電路,其中重點是a / d板部分。
The hardware designing include the interface with engine controller , such as d / a conversion . we chose the ad75089 which was produced by ad corp . this is a parallel port digital to analog conversion , and i give the presentation about its structure and connection scheme . in order to resolve the contradiction between faster computation and slower display , a buffer storage also needed 第二部分詳細陳述了高速數據傳輸卡的軟、硬件設計過程,硬件設計包括dsp與pci總線的接口、 dsp與外部控制器的接口、以及電路卡上的擴展數據緩沖區的設計,并使用專門的工具軟件protel繪出全部硬件電路的設計原理圖。