Design of True Random Number Generator Based on Multi-Ring Convergence Oscillator Using Short Pulse Enhanced Randomness - Tianming Ni; Qingsong Peng; Jingchang Bian; Liang Yao; Zhengfeng Huang; Aibin Yan; Senling Wang; Xiaoqing Wen (IEEE Transactions on Circuits and Systems I: Regular Papers, 2023)