基于电平转换器的物理不可克隆函数电路设计

Novel level shifter based physical unclonable function circuit design

提出一种基于通用交叉耦合电平转换器的低开销新型物理不可克隆函数的电路设计。该设计只需在传统电平转换电路中引入一个额外的开关晶体管,用来切换电平转换器的差分工作模式和共模工作模式,利用交叉耦合网络中两个PMOS晶体管由于开关速度不同所引起的输出电压的不确定性,通过共模模式输出获取所必需的熵值。该电路采用标准65 nm CMOS工艺进行设计,仿真结果显示该PUF的唯一性为49.11%,接近理想值。在电压为1.0~1.5 V内,可靠性可达96.09%,而在环境温度为-20~100℃内,可靠性可达95.31%。同时在高速吞吐率为20 Mbit/s时,每比特输出能耗仅为0.72 pJ(1.2 V,27℃)。

Level shifters are widely used in low-power,multi-threshold integrated circuit chips.A novel physical unclonable function(PUF)design based on cross-coupled level shifter was proposed.In this work,a single switching transistor was inserted in the level shifter,which was the only overhead per response bit to change the operation mode of the cross-coupled level shifter from differential to common.The signature of the PUF was extracted while in common mode,by exploiting the uncertainty of the output voltage due to the difference of the switching time of the two PMOS in the cross-coupled network.Simulated with a standard 65 nm CMOS process,the results show the proposed PUF can produce a uniqueness of 49.11% and a reliability of 96.09% with the power supply voltage ranged from 1.0 V to 1.5 V and 95.31% with the temperature ranged from-20℃ to 100℃.The energy per bit is only 0.72 pJ at a high throughput of 20 Mbit/s(1.2 V,27℃).