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。     

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.     

模数转换器在便携式数据采集仪中的应用

介绍模数转换器ＴＣＬ２５４３及其在便携式数据采集仪中的应用。     

Σ-ΔA/D转换器原理及其在DCS中的应用

ＡＤＳ１２１３ 是基于Σ—Δ转换技术的新一代模数转换芯片,性能优越性,价格低廉。本文详细介绍了ＡＤＳ１２１３的基本原理、功能及应用。     

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、D/A接口转换精度测试系统

文中设计了一种对A/D接口的测试与D/A接口的测试一样简单转换精度测试系统.利用此系统,用户可以灵活地选择A/D或D/A接口任意个数通道进行测试,可以根据需要修改测试数据,可以全通道测试,可以根据实际需要指定基准值.系统具有较好的可扩展性和灵活性.     

7(1/2)位A/D转换器的研制

为满足高精度电压测量的要求 ,研制了电荷平衡与单斜相结合的多斜式模数转换器。分析了复合运放提高性能的原理 ,利用两运算放大器设计了高性能复合放大器 ,以构成理想的积分电路。在对输入电压积分的同时 ,不断释放标准单位电荷量 ,以形成模数转换器的电荷平衡过程 ,并通过计数取得高位读数。断开输入后 ,连续释放剩余电荷以形成单斜过程 ,并取得低位读数。通过高低位读数的合成及采用合理的校正措施 ,模数转换器的分辨率达到七位半以上     

提高A/D转换速度的方法

数字仪表及单片机测控系统中,A／D变换是不可缺少的环节。对于模拟量变化较快的系统,A／D变换速度也相应要求快些,才不至于丢失信息。然而A／D变换速度和成本是矛盾的。本文试以MSP430F11X1系列单片机为例,探讨以较低成本提高A／D转换速度的方法。     

基于单片机的模数转换接口设计

随着数字处理技术的发展,模拟/数字转换(A/D转换器)在数据采集系统中的应用越来越广泛.通过对A/D转换原理的介绍,绐出了以AT89C51单片机为核心控制芯片,通过对MAX197模数转换芯片的控制进行数据采集的接口电路和程序流程,为设计数据采集系统提供了一种方案.     

常用双积分型A/D转换器自动量程转换接口电路

设计一种简单、实用的接口电路，它与常用双积分型A／D转换器配合，可实现自动量程转换功能，扩展这类芯片的测量范围。提高其测量精度。该接口电路具有体积小、成本低、结构简单、调试容易和工作可靠的特点，可以和不同型号的双积分型A／D转换器联接。