High-Speed Noise-Based Random Bit Generator by Removing 1/f Noise with Differential Comparison
High-Speed Noise-Based Random Bit Generator by Removing 1/f Noise with Differential Comparison

A design scheme of high-speed physical random bit generator is proposed by utilizing a wideband white noise as an entropy source. The difference operation between the wideband noise signal and its delayed signal is done to produce a series of binary code by a differential comparator.The D flip-flop,which is triggered by a clock, samples the output of the comparator. A random bit sequence at rates of up to 720.Mbit/s is obtained after the exclusive-OR operation. The differential comparison on noise signals can effectively eliminate 1/f characteristics of the amplified noise, and correct the probability density distribution deviation of noise signal amplitude. The quality of the resulting random sequence is verified using common tests of statistical randomness.
A design scheme of high-speed physical random bit generator is proposed by utilizing a wideband white noise as an entropy source. The difference operation between the wideband noise signal and its delayed signal is done to produce a series of binary code by a differential comparator.The D flip-flop,which is triggered by a clock, samples the output of the comparator. A random bit sequence at rates of up to 720.Mbit/s is obtained after the exclusive-OR operation. The differential comparison on noise signals can effectively eliminate 1/f characteristics of the amplified noise, and correct the probability density distribution deviation of noise signal amplitude. The quality of the resulting random sequence is verified using common tests of statistical randomness.