Two new low-power Full Adders based on majority-not gates

Two novel low-power 1-bit Full Adder cells are proposed in this paper. Both of them are based on majority-not gates, which are designed with new methods in each cell. The first cell is only composed of input capacitors and CMOS inverters, and the second one also takes advantage of a high-performance CMOS bridge circuit. These kinds of designs enjoy low power consumption, a high degree of regularity, and simplicity. Low power consumption is targeted in implementation of our designs. Eight state-of-the-art 1-bit Full Adders and two proposed Full Adders are simulated using 0.18 μm CMOS technology at many supply voltages. Simulation results demonstrate improvement in terms of power consumption and power-delay product (PDP).     

16位Σ-Δ模数转换器AD7705及其校准

AD7705是AD公司推出的16位高性能、低功耗ΣΔA/D转换器,具有增益可编程放大器,可通过编程直接测量传感器输出的微弱信号。介绍了AD7705的基本特点、结构以及常用片上寄存器的格式与编程注意事项。自校准和系统校准可消除偏置和增益误差,由于现场条件变化不定,还详细介绍了适用于特定条件的现场校准与手动校准,最后给出了数据手册中没有的手动校准实例。     

高速A/D转换器AD9481原理及应用

在采集速率要求高的场合,A/D转换器的性能起关键作用。AD9481是模拟器件公司的8位250 MHz采样率A/D转换器。介绍了AD9481的主要性能、引脚构成、内部结构、工作时序,提供了参考设计电路。最后给出了基于FPGA控制转换的原理框图。为基于AD9481的高速A/D转换电路设计提供了参考依据。     

Simultaneous Static Testing of A/D and D/A Converters Using a Built‐in Structure

Static testing of analog‐to‐digital (A/D) and digital‐to‐analog (D/A) converters becomes more difficult when they are embedded in a system on chip. Built‐in self‐test (BIST) reduces the need for external support for testing. This paper proposes a new static BIST structure for testing both A/D and D/A converters. By sharing test circuitry, the proposed BIST reduces the hardware overhead. Furthermore, test time can also be reduced using the simultaneous test strategy of the proposed BIST. The proposed method can be applied in various A/D and D/A converter resolutions and analog signal swing ranges. Simulation results are presented to validate the proposed method by showing how linearity errors are detected in different situations.     

浅谈IPPBX在企业中的应用

多业务应用在IP网络上的传递现已成为企业在进行数据网络建设和改造时的一个重要课题,衣文在对IPPBX的实现方式进行介绍的基础上重点讨论IPPBX＋IPPHONE模式在企业内部VoIP方面的应用     

产品接地不良案例

对某工程现场多台返修设备的故障情况进行了分析,找到了引起故障的主要原因是接地不良,并提出了相应的整改方案。改进后的产品抗干扰能力明显增强,满足工程要求。     

基于AT89C2051单片机的智能充电器设计

为解决7.2V锂离子电池和6V镍氢/镍镉电池的充电,设计了一种通用智能充电器,它以AT89C2051单片机、MAX846A等为核心.介绍了智能充电器的工作原理、设计特点和三种充电模式,详细讨论了系统的硬件构成及软件实现方法.由于采用了高性能的微控制器及高分辨率的A/D转换电路,保证了充电器具有很高的系统精度.     

多路温度自动巡检系统

设计了一种8路温度巡检仪,能够对8通道循环检测温度,当温度超过上限时,实现报警功能。硬件上,利用半导体集成温度传感器检测温度,由单片机控制,进行A/D转换,在显示器上显示测量出的温度。软件上,单片机编程以实现对各测试点温度值的检测和集中管理。     

基于单片机空气质量检测系统

由粉尘传感器测量空气粉尘浓度,转换成数字量送单片机,单片机分析处理转换成浓度值再与设定浓度值比较;显示器显示空气中粉尘测量浓度和设定浓度;当粉尘浓度超限时,声光报警;