一种高线性度电压电流转换电路的设计与实现  

Highly Linear CMOS Voltage-to-Current Converter

作　　者：周明珠[1] 朱恩[1] 王守军 王志功[1] 韩鹏[1] 李伟[1] 

机构地区：[1]东南大学射频与光电集成电路研究所,南京210096 [2]IDT-shanghai,上海200233

出　　处：《固体电子学研究与进展》2009年第2期281-286,共6页Research & Progress of SSE

基　　金：863计划项目(课题编号:2003AA31g030)

摘　　要：介绍了利用CSMC 0.6μm CMOS工艺实现的、应用于电流模逻辑电路中的高线性度电压电流转换(VTC)电路。该电路采用了高增益两级运算放大器,以及工作在弱反型区的MOS管电压电流呈指数律关系实现的PTAT基准电流源。详细分析了电阻与运算放大器的非线性影响因素。测试结果表明,输出的总谐波失真为0.0002%,输入动态范围为0～2.6V,输出电流为50～426μA,PTAT基准电流源对电源变化的灵敏度为0.0217。芯片采用5V供电,功耗约为1.3mW,芯片面积为0.112mm2。A highly linear CMOS voltage-to-current （VTC） converter for current-mode analog and digital integrated circuits is described. By utilizing a high gain operational amplifier （OPA）, a Proportional to Absolute Temperature （PTAT） current reference, and a small voltage coefficient poly-silicon resistor, a high linearity is achieved. The resistor and the OPA nonlinearity behavior have been analyzed. The circuit has been implemented in a standard 0. 6 μm CMOS technology. The low frequency gain of the OPA exceeds 90 dB. The test result indicates that the total harmonic distortion （THD） is 0. 0002%. The common-mode input linearity ranges from 0-2.6 V. Correspondingly, the output current range is 50-426μA. The sensitivity of the PTAT current reference to VDD is approximately 0. 0217. The chip consumes less than 1.3 mW for a 5 V supply, and occupies 0. 112 mm^2 of area.

关 键 词：线性电压电流转换电路 谐波失真 PTAT基准电流源 运算放大器 

分 类 号：TN432[电子电信—微电子学与固体电子学]