一款增益可调的28 nm三通道10位DAC

发布时间：2018-06-29 10:00

本文选题：DAC + 数模转换器　；参考：《微电子学与计算机》2017年11期

【摘要】：基于SMIC 28nm CMOS工艺,实现了一款增益可调的三通道的300MS/s 10bit的数模转换器.此数模转化器可以通过5位的控制字实现0~-5.75dB的增益调节,适应更多的应用环境.数模转换器采用分段式结构,其中高六位采用温度计码,低四位采用二进制码.在电流源单元开关部分采用限幅电路,提高无杂散动态范围.带隙基准单元采用低电压输出结构,满足电压电流转换单元中的栅压要求.在1.8V模拟电源电压,1.05V数字电压下,采样时钟在300 MHz的时候,无杂散动态范围(SFDR)为64dB,微分非线性小于(DNL)±0.3LSB;积分非线性小于(INL)±0.4LSB.
[Abstract]:Based on SMIC 28nm CMOS technology, a three-channel digital-to-analog converter with three channels, 300MS / s 10bit, is implemented. This digital-analog converter can realize gain adjustment of 0 ~ 5.75 dB through 5-bit control word, which is suitable for more application environment. The digital-to-analog converter adopts a segmented structure, in which the thermometer code is used for the high six bits and the binary code is used for the lower four bits. The limiting circuit is used in the switch part of the current source unit to improve the non-spurious dynamic range. The bandgap reference unit adopts a low voltage output structure to meet the gate voltage requirements in the voltage-current conversion unit. At 1.8V analog power supply voltage of 1.05V, the sampling clock at 300MHz has a non-spurious dynamic range (SFDR) of 64dB, differential nonlinearity less than (DNL) 卤0.3LSBand integral nonlinearity less than (INL) 卤0.4LSB.
【作者单位】：中国科学院微电子研究所;中国科学院大学;
【基金】：国家科技重大专项资助项目(Y4GZ242001)
【分类号】：TN792

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