提出了一种数模混合的真随机数发生器设计方案,利用RC电路充放电时间的不稳定性作为随机噪声源,并采用8个噪声源模块并行工作.8个噪声源模块产生的16比特随机数经由模加、异或、移位和反馈组成的算法处理后输出8比特分布均匀、相互独立的随机数,同时为了方便外部应用,设计了串并行输出单元.将整个真随机数发生器在Spectre模拟器下进行了仿真与测试,结果表明,随机数生成速率为3.2MHz,且能够通过FIPS140-2的随机性检测.%A design scheme for true random number generator based on mixed-signal is presented, the instability of charging-dis charging time of RC circuit acts as the random noise source, and adopting 8 noise sources parallel working. And the 16 bits ran dom number produced by the 8 noise sources is processed by the arithmetic which is composed of module adding, xor, shift and feedback, and then output 8 bits random number which are uniform and independent. Meanwhile, a serial and parallel output cell is designed in order to the exterior application can read the random number conveniently. At last, the whole true random number generator is simulated and tested by cadence spectre simulator, the experimental result indicates that, the bit rates is up to 3. 2MHz, and the random number can pass the FIPS140-2 randomness test.
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