采用双R_2R电阻网络结构的12位电压型D_A转换器.pdfVIP

39 3 Vol39, No. 3 2009 6 Micr oelectr onics Jun. 2009 R2R 12 D/ A 1, 2 1, 2 1, 2 1, 2 1 张俊安 , 周述涛 , 张正平 , 李儒章 , 高煜寒 ( 1. , 400060; 2. , 400060) : 介绍了采用双R2R 电阻网络结构实现 12 位电压输 型 D/ A 转换器的设计及激光修 调方案重点分析了运放失调电压对双R2R 电阻网络结构D/ A 转换器线性误差的影响, 并与其 他常见的实现双极性电压输 的R2R 电阻网络结构进行比较, 给 了理论估计和仿真结果采 用双R2R 电阻网络实现的12 位D/ A 转换器芯片( 不包括运放)在带 CrSi 电阻的8m CM S 工 艺上流片和修调测试电阻网络芯片和运放芯片采用厚膜混合工艺组装, 实现电压输 D/ A 转换 器功能测试结果显示, 设计的电路达到了预期目标 : 双R2R 电阻网络; 电压型D/ A 转换器; 线性误差; 激光修调 + :T N79 2 :A : 2009) A VoltageMode 12Bit D/ A Converter Based on Dual R2R Network 1, 2 1, 2 1, 2 1, 2 1 ZHANG Junan , ZH U Shutao , ZHANG Zhengping , LI Ruzhang , GA Yuhan ( 1. S ich uan Institute of SolidState Circuits , China E lectr onics Technology Group Corp . , Chong qing 400060, P. R. China; 2. National aboratory of Analog I ntegr ated Cir cuits , Chong qing 400060, P . R . China) Abstract: A voltagemode 12bit D/ A converter with dual R2R network structure using laser trimming was presented. Influence of the operational amplifier s offset voltage on integral nonlinearity ( INL) of dual R2R net work structures was analyzed in particular, and a comparison was madewith other common R2R network structures for bipolar voltage output. T heoretical calculation and simulation results were described. A 12bit D/ A converter IC based on the dual R2R network was fabricated and trimmed in 8 m CM S process technology with CrSi resistor. The dual R2R network chip and the operational amplifier chip were assembled in hybrid IC process to realize voltage output. Measured results showed that the D/