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本文提出了一种14位20GS/s的RF采样DAC，通过工艺温度自适应电平移位和低交叉点控制的开关驱动器，以及ISI最小化动态元素匹配算法，在8.9GHz频率下实现了70.4dBc的IMD3，解决了高速采样中码间干扰引起的失真问题。
RF-sampling DAC. By introducing a switch driver with process-and-temperature-adaptive (PT-adaptive) level shifting and enhanced low-crosspoint control, the DAC demonstrates an IMD3 of 70.8dBc at 7.2GHz and 16Gs/s, and a maximum output power of 7dBm. An algorithm, named ISI-minimizing dynamic element matching (ISIM-DEM), is proposed to mitigate output distortion induced by inter-symbol interference (ISI) effect at 20GS/s sampling, achieving 73dBc IMD3 at 8.5GHz. 5G-A and 6G applications depend heavily on data converters with multi-GHz signal bandwidth and ever-increasing carrier frequency, while at the same time the trend of IF/RF integration requires an advanced technology node and good power efficiency. In [1] a mixing-DAC is used to put the carrier in 2nd and 3rd Nyquist zones, which leads to additional
Hao Luo*, Zhijun Long*, Wentao Zhu, Haowei Lu, Yushen Fu, Mingqian Lei, Cheng Wang, Xiaoge Zhu, Yumei Diao, Haipeng Zhu, Jiajun Zhong, Li Tian,
Yi Yang, Xinli Geng, Keqing Ouyang Sanechips Technology, Shenzhen, China *Equally Credited Authors (ECAs) Abstract This work presents a 14b 20GS/s