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.
标签： Digitally Assisted Pipeline ADCs
上传时间： 2020-05-27
上传用户：shancjb
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.
标签： Telecommunications Economics Mobile of
上传时间： 2020-05-27
上传用户：shancjb
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.
标签： Engineering Audio
上传时间： 2020-06-09
上传用户：shancjb
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)');
标签： ketang
上传时间： 2020-11-10
上传用户：
DS1302包括时钟/日历寄存器和31字节（8位）的数据暂存寄存器，数据通信仅通过一条串行输入输出口。实时时钟/日历提供包括秒、分、时、日期、月份和年份信息。闰年可自行调整，可选择12小时制和24小时制，可以设置AM、PM。 主要工作原理图如figure 1 所示：移位寄存器，控制逻辑，晶振，时钟和RAM。在进行任何数据传输时，必须被制高电平（注意虽然将它置为高电平，内部时钟还是在晶振作用下走时的，此时，允许外部读写数据），在每个SCLK上升沿时数据被输入，下降沿时数据被输出，一次只能读写一位，适度还是写需要通过串行输入控制指令来实现（也是一个字节），通过8个脉冲便可读取一个字节从而实现串行输入与输出。最初通过8个时钟周期载入控制字节到移位寄存器。如果控制指令选择的是单字节模式，连续的8个时钟脉冲可以进行8位数据的写和8位数据的读操作，SCLK时钟的上升沿时，数据被写入DS1302，SCLK脉冲的下降沿读出DS1302的数据。8个脉冲便可读写一个字节。在突发模式，通过连续的脉冲一次性读写完7个字节的时钟/日历寄存器（注意时钟/日历寄存器要读写完），也可以一次性读写8~328位RAM数据（可按实际情况读写一定数量的位，不必全部读写， 两者的区别）。
上传时间： 2022-06-24
上传用户：默默
