A high-precision foreground calibration method for 16-bit current-steering DAC
Keywords:
High precision calibration; Foreground calibration; Current source mismatch; Current steering DAC;Abstract
Based on 28 nm CMOS technology, a 16-bit current-steering digital-to-analog converter (DAC) circuit was designed using a high-precision foreground calibration technology. The foreground calibration algorithm calibrates all current sources corresponding to 16-bit data, and only two current sources are used, which reduces the difficulty of calibration and improves the accuracy of calibration. The calibration circuit introduces two calibration supplementary currents, which are used to compensate for the current source mismatch caused by temperature and output current changes, further reducing the mismatch of the DAC current source and effectively improving the overall performance of the DAC. After calibration, the differential nonlinearity is ≤0.8 LSB, the integral nonlinearity is ≤2.0 LSB, and the spurious-free dynamic range is ≥75.3 dB at a 200 MHz output signal within the temperature range of -40 to 85℃. This calibration method improves the temperature stability of the DAC.References
[1] A temperature-tracking current source mismatch foreground calibration technique [J]. Yang Weidong, Liu Jun, Liu Yantong, Ma Shibi, Wen Xianchao. Microelectronics . 2022(06)
[2] A front-end calibration method for 16-bit current-steering D/A converter [J]. Zhao Hongliang, Pu Jia, Liu Shukai, He Shanliang. Research and Progress in Solid-State Electronics . 2019(05)
[3] Study on the improvement of DAC area characteristics by calibration [J]. Xu Ning, Li Fule, Zhang Chun. Information Technology . 2015(04)
[4] A digital calibration technique for 14 bit 200 MS/s current-steering DAC [J]. Cheng Long, Lin Yujing, Ye Fan, Li Ning, Ren Junyan. Research and Progress in Solid-State Electronics . 2013(05)
[5] Research and implementation of key design technologies for high-speed and high-precision current-steering digital-to-analog converters [D]. Xue Xiaobo. Zhejiang University, 2014
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Copyright (c) 2024 Zhang Yan, He Shanliang (Author)
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