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  • Digitally+Assisted+Pipeline+ADCs

    The continued reduction of integrated circuit feature sizes and commensurate improvements in device performance are fueling the progress to higher functionality and new application areas. For example, over the last 15 years, the performance of microprocessors has increased 1000 times. Analog circuit performance has also improved, albeit at a slower pace. For example, over the same period the speed/resolution figure-of-merit of analog-to-digital converters improved by only a factor 10.

    標簽: Digitally Assisted Pipeline ADCs

    上傳時間: 2020-05-27

    上傳用戶:shancjb

  • Economics+of+Mobile+Telecommunications

    A series of features makes the mobile telecommunications industry an interesting field of investigation for economists: the industry is experi- encing veryfastmarketgrowthcombinedwithrapidtechnological change; regulatory design in setting market structure is playing a very important role; and oligopolistic competition is unfolding under various forms. The number of subscribers to mobile networks is growing at a rapid rate on a worldwide basis, as shown in figure 1.1. 

    標簽: Telecommunications Economics Mobile of

    上傳時間: 2020-05-27

    上傳用戶:shancjb

  • Audio+Engineering

    Sound is simply an airborne version of vibration. The air which carries sound is a mixture of gases. In gases, the molecules contain so much energy that they break free from their neighbors and rush around at high speed. As figure 1.1(a) shows, the innumerable elastic collisions of these high-speed molecules produce pressure on the walls of any gas container. If left undisturbed in a container at a constant temperature, eventually the pressure throughout would be constant and uniform.

    標簽: Engineering Audio

    上傳時間: 2020-06-09

    上傳用戶:shancjb

  • ketang

    x=[1,2,0,-1,3,2];h=[1,-1,1]; y1=x*h(1); y2=x*h(2); y3=x*h(3); Y1=[0,0,y1]; Y2=[0,y2,0]; Y3=[y3,0,0]; y=Y1+Y2+Y3; L=-2:1:5; figure(1); subplot(211);stem(L,y,'*'); xlabel('L');ylabel('y');title('(1)'); X=x.';X=X'; r1=X*y(1);r2=X*y(2);r3=X*y(3);r4=X*y(4); r5=X*y(5);r6=X*y(6);r7=X*y(7);r8=X*y(8); R1=[0,0,0,0,0,0,0,r1];R2=[0,0,0,0,0,0,r2,0]; R3=[0,0,0,0,0,r3,0,0];R4=[0,0,0,0,r4,0,0,0]; R5=[0,0,0,r5,0,0,0,0];R6=[0,0,r6,0,0,0,0,0]; R7=[0,r7,0,0,0,0,0,0];R8=[r8,0,0,0,0,0,0,0]; R=R1+R2+R3+R4+R5+R6+R7+R8; n=-7:5; subplot(212);stem(n,R);title('(2)');

    標簽: ketang

    上傳時間: 2020-11-10

    上傳用戶:

  • DS1302實時時鐘芯片的中文資料詳細概述

    DS1302包括時鐘/日歷寄存器和31字節(jié)(8位)的數(shù)據(jù)暫存寄存器,數(shù)據(jù)通信僅通過一條串行輸入輸出口。實時時鐘/日歷提供包括秒、分、時、日期、月份和年份信息。閏年可自行調(diào)整,可選擇12小時制和24小時制,可以設(shè)置AM、PM。  主要工作原理圖如figure 1 所示:移位寄存器,控制邏輯,晶振,時鐘和RAM。在進行任何數(shù)據(jù)傳輸時,必須被制高電平(注意雖然將它置為高電平,內(nèi)部時鐘還是在晶振作用下走時的,此時,允許外部讀寫數(shù)據(jù)),在每個SCLK上升沿時數(shù)據(jù)被輸入,下降沿時數(shù)據(jù)被輸出,一次只能讀寫一位,適度還是寫需要通過串行輸入控制指令來實現(xiàn)(也是一個字節(jié)),通過8個脈沖便可讀取一個字節(jié)從而實現(xiàn)串行輸入與輸出。最初通過8個時鐘周期載入控制字節(jié)到移位寄存器。如果控制指令選擇的是單字節(jié)模式,連續(xù)的8個時鐘脈沖可以進行8位數(shù)據(jù)的寫和8位數(shù)據(jù)的讀操作,SCLK時鐘的上升沿時,數(shù)據(jù)被寫入DS1302,SCLK脈沖的下降沿讀出DS1302的數(shù)據(jù)。8個脈沖便可讀寫一個字節(jié)。在突發(fā)模式,通過連續(xù)的脈沖一次性讀寫完7個字節(jié)的時鐘/日歷寄存器(注意時鐘/日歷寄存器要讀寫完),也可以一次性讀寫8~328位RAM數(shù)據(jù)(可按實際情況讀寫一定數(shù)量的位,不必全部讀寫, 兩者的區(qū)別)。

    標簽: ds1302 實時時鐘

    上傳時間: 2022-06-24

    上傳用戶:默默

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