流水线模数转换器的接口技术

介绍了基于流水线结构的模数转换器的基本结构及原理，并在此基础上给出了流水线型AD转换器的接口电路．能很好地匹配AD转换器的性能。消除转换时产生的误差和干扰。     

流水线模数转换器中的宽带电流型运算放大器

针对高清视频信号处理对动态范围大,运算速度快的模数转换器(ADC)的要求,提出了一种流水线宽带电流型运算放大器。该运算放大器的主放大器采用套筒式增益提高结构,辅助运算放大器用电流型放大器替代。采用电流共模反馈电路调节主运算放大器的支路电流以稳定输出共模电平;采用TSMC 0.18μm CMOS工艺设计电路。实验结果显示:辅助运算放大器采用源极输入,减小了信号主通路上的寄生电容,提高了整个运算放大器的电路速度。运算放大器的增益为83.19dB,相位裕度为61.6°,单位增益带宽为1.6GHz,功耗为9.3mW;在满幅度阶跃输入的情况下,输出建立时间小于1.83ns。将该运算放大器用于高清视频信号的流水线ADC中,实现了170MS/s,10bit精度的模数转换。同传统的电压型运算放大器相比,该运算放大器响应速度更快,功耗更低,可满足处理视频信号的要求。     

功率放大器及其接口电路

功率放大器及其接口电路中科院长春光机所杜宇目前，用于双方向驱动的直流电动机电路中的功率放大器常常采用由四个臂组成的桥式电路．图１是一个应用于脉冲调宽（ＰＷＭ）调速系统中的功率放大器，它是由Ａ、Ｂ、Ｃ、Ｄ四臂组成，工作原理简述如下：由Ｖ１、Ｖ４、Ｖ５、...     

PXI接口电路的设计

采用EP2C8开发自主的PCI接口,并结合PXI接口的特定电气要求完成自主化PXI接口控制器的开发。系统设计是在QuartusII5.0的平台上用VHDL硬件描述语言完成的,设计PXI模块时充分考虑了CompactPCI规范的电气规定。     

一种低／高压MOS接口电路

一、前言近年来,高压、功率运用中,MOS 管的应用日益广泛。这是因为它具有高的输入阻抗,好的热稳定性及极少的存储效应。特别是它作为电流器件时,可以并联应用而带来不少方便而引人注目。我室自1985年鉴定了“低/高压 MOS 接口电路”后,一方面自己组织小批量生产,另一方面根据生产中反     

CMOS接口电路的应用

CMOS电路具有电源电压范围宽,输入电流小,输出摆幅大,抗干扰性强,静态功耗低等特点。CMOS接口电路(或称缓冲变换器)除有以上特点外,还具有驱动能力强、逻辑电平变换和三态控制等功能,因而被广泛应用于自动控制、仪器仪表和通讯设备等多种领域中。本文就CMOS电路与TTL、DTL、HTL、NMOS、PMOS等逻辑电路衔接的接口电路匹配问题进行分析,并例举各种典型应用实例。     

用于铂电阻温度传感器的接口电路

用于铂电阻温度传感器的接口电路长春气象仪器研究所姜树堂铂电阻是目前广泛使用的精度高、稳定性好、性能可靠的测温元件。但是，铂电阻温度传感器使用时也有不便之处，比如，输出信号弱、非线性、正负温度的分辨率不同、模拟量输出不能与计算机直接相连等等。因此，研制...     

自动装置中串行通讯接口电路

本文分析了自动装置中三种常用的串行总线接口电路的设计方案,阐述了接口电路设计过程中应注意的问题,给出了三种总线的相互转换电路,该电路无需RTS信号即可实现多点网络通讯。该电路已在实际自动化装置中得到成功应用。     

数字万用表测温接口电路

介绍一种具有非线性校正功能的铂电阻温度测量电路，它能直接与数字万用表接口，进行高准确度的温度测量，传感器稍加改进即可测量人体温度。     

一种实用的传感器接口电路

本文介绍了一种实用的用于电桥测量的传感器接口电路。该电路的特点是恒流源对电桥供电，高精度初级放大，带运算的末级放大，放大后的电压双极性输出可使分辨率提高一倍。     

Principles of new method of optimisation, design and modelling of pipeline A/D converters

The paper presents the foundations of a new approach to design, optimisation and modelling of a new class of pipeline analogue-to-digital converters (PADC). The approach employs the results of analytical and applied research on the concurrent optimisation of the analogue and digital parts of adaptive estimation systems. Application of the approach allows to modify the known architecture and principles of conversion used in conventional PADC in the way significantly improving quality of conversion. Particularities of functioning of new PADC were studied in advanced simulation experiments, which confirmed the results of analytical investigations. Special attention was paid to comparison of the performance of new and known PADC and assessment of potentially achievable benefits.     

A survey on the dynamic characterization of A/D converters

This article presents the different ways used to characterize A/D converters through the “CanTest System” test bench and its functionalities. The different ways used to characterize A/D converters dynamically could be organized into three parts: time domain, statistical and spectral analysis. The most commonly used algorithms in time domain analysis are presented. Due to instrumentation error, some may give “inaccurate” results. We explain why and propose a new method based on a direct estimation of conversion noise to avoid this problem. The different methods and applications linked to statistical analysis are also described. We explain the three different methods used to measure the differential non-linearity (DNL) and the integral non-linearity (INL). A comparison between these three algorithms in simulation and through an experimental case shows that their behaviours differ when the histogram presents edging effects. The final study presented in this paper concerns the A/D converter performance evaluation by analysis in frequency domain. From the output power spectrum, relationships are given for the computation of all spectral parameters. We present a correction to include in the computation of spectral parameters when the analog input does not span the entire full-scale range of the A/D converter under test. When the input generator provides a sine wave with harmonics, we propose the “Dual-Tone” method in order to separate the distortion associated with the component and the one associated with the generator. In the last part of this paper, we describe the test bench giving its specifications (acquisition system, frequency range,…). Some typical measurements and comments about the interest of analysis in different modes are given also.     

Measuring the static characteristic of dithered A/D converters

Dithering is a useful technique that removes quantization error and part of the linearity error in A/D converters. Removing the remaining static error requires a periodical fast measurement of the characteristic, which is a rather difficult task because of the intrinsic very high resolution of the dithered device. Focusing on this issue, the paper examines three possible test methods: statistical analysis, time domain analysis, and, with more detail, frequency domain analysis. The peculiar nature of the static characteristic of dithered converters makes the third method particularly attractive. The frequency domain technique is proposed, therefore, as a good practical tool for implementing linearization in A/D converters with dither.     

Elimination of drift-like errors in intelligent cyclic A/D converters

The paper presents a new method of elimination of influence of drift-like errors in so called intelligent cyclic A/D converters, in particular, errors caused by drifts (droops) of voltage at the output of sample-and-hold blocks. The method is based on application of the extended multi-dimensional algorithm, which estimates simultaneously values of the input sample and drift rate. Implementation of the extended algorithm in the intelligent cyclic A/D converters requires only insignificant changes in the digital part of the converter and does not increase their production costs. The motivations to these investigations resulted from practical realizations of the intelligent cyclic A/D converter in CMOS technology and difficulties in design of a precise sample-and-hold circuit. The results of selected simulation experiments related to analysis of influence of a droop rate on the final performance of the intelligent cyclic A/D converters employing the standard (one-dimensional) and extended algorithms are discussed and compared in the paper. The results of experiments show that application of the proposed solution enables efficient functioning of the converters even in the presence of relatively large drifts.     

A／D转换器线性误差动态测试技术

本文利用直方图测试理论并通过相应的数字运算以求解Ａ／Ｄ转换器的线性误差,从而对一种在动态输入条件下基于计算机控制的Ａ／Ｄ转换器测试技术进行了分析探讨。     

基于打印机接口的A/D转换卡设计

本文介绍了一种通过打印机接口对模拟信号进行数据采集的接口卡，作者运用89C51单片机实现与12位串行A/D转换器的连接，并将所采集的数据通过微型计算机打印机接口以每次四位的方式分三次将所采数据送入微型计算机，完成对模拟信号的数据采集，该采集卡适用于便携微型计算机在野外进行数据采集。     

DSP系统的A/D接口设计

介绍基于TMS320VC54XX定点DSP常见的两种A/D接口电路的设计方案及其特点,并给出了编程思路.     

一种简单实用的A/D转换接口电路

提出了一种AT89系列单片机与41／2位A／D转换器ICL7135的接口电路，给出了该电路的驱动程序。与常见的接口电路比较，具有结构简单、战胜单片机资源少、执行速度快的特点。     

单片机与A/D转换器的接口设计

介绍采用AT89C51单片机与MAX195A／D转换器实现高精度数据采集的方法，分析其硬件接口及软件编程技巧，并给出相应的电路及程序代码。