一种跟踪温度的电流源失配前台校准技术  

A Current Source Mismatch Foreground Calibration Technique for Temperature Tracking

作　　者：杨卫东[1,2] 刘军[1,2] 刘彦彤[3] 马世碧 温显超 YANG Weidong;LIU Jun;LIU Yantong;MA Shibi;WEN Xianchao(National Laboratory of Science and Technology on Analog Integrated Circuit,Chongqing400060,P.R.China;The 24th Research Institute of China Electronics Technology Group Corporation,Chongqing400060,P.R.China;School of Instrument Science and Opto-Electronics,Hefei University of Technology,Hefei 230009,P.R.China)

机构地区：[1]模拟集成电路国家级重点实验室,重庆400060 [2]中国电子科技集团公司第二十四研究所,重庆400060 [3]合肥工业大学仪器科学与光电工程学院,合肥230009

出　　处：《微电子学》2022年第6期921-926,共6页Microelectronics

基　　金：模拟集成电路国家级重点实验室基金资助项目(61428020109)

摘　　要：提出了一种应用于超高速D/A转换器电流源失配的前台校准技术。设计了两个校准子DAC,其分别提供的校准电流用以补偿电流源失配的两大组成部分,每一个校准DAC具有与其对应的失配部分同样的温度特性。因此,总校准电流可以自动跟踪温度的变化。两个校准子DAC采用两个不同的偏置电流替代不同的温度,再经设计的校准算法获得校准数码。该校准方案可有效减少校准时间,提升前台校准的温度稳定性。基于标准65 nm CMOS工艺设计的16位12 GS/s电流舵D/A转换器验证了这项前台校准技术。测试结果表明,模拟输出为1 GHz时,该DAC的SFDR达到65 dBc;通过校准后,在-55℃~125℃范围内,DNL的变化率小于8%,INL的变化率小于5%。相比其他同类校准技术,该校准技术能获得更好的温度稳定性。A foreground calibration technique for current source mismatch in ultra-high-speed DAC was presented.Two calibration sub-DACs were designed.The calibration currents provided by the two DACs were used to compensate the two components of the current source mismatch.Each calibration DAC had the same temperature characteristics as its corresponding mismatch part.Therefore,the total calibration current could automatically track the temperature changes.The two calibration sub-DACs used two different bias currents to replace different temperatures,and then the calibration number was obtained by the designed calibration algorithm.The calibration scheme could effectively reduce the calibration time and improve the temperature stability of the front calibration.A 16-bit 12 GS/s current-steering D/A converter designed in a standard 65 nm CMOS process validated this calibration technology.The test results show that the SFDR of the DAC reachs 65 dBc at 1 GHz analog output.After calibration,the change rate of DNL is less than 8%,and the change rate of INL is less than 5%in the range of-55℃to 125℃.Compared with other similar calibration techniques,this calibration technique could achieve better temperature stability.

关 键 词：电流舵DAC 前台校准 跟踪温度 

分 类 号：TN792[电子电信—电路与系统]