Patent ID: 8024386
Filing Date: 2011-09-20
Classification: G06F

Abstract:
1. An apparatus for generating random numbers, comprising: a first level sampling device comprising a first oscillator configured to generate a first oscillating signal, a second oscillator configured to generate a second oscillating signal, and a first sampler configured to sample the first oscillating signal under control of the second oscillating signal to generate a first output signal; and a second level sampling device comprising a voltage-controlled oscillator configured to generate a voltage-controlled oscillating signal by using the first output signal as a control voltage, and a second sampler configured to sample the first oscillating signal under control of the voltage-controlled oscillating signal to generate a random number; wherein: the first sampler comprises a D-type Flip-flop comprising a data input coupled to an output of the first oscillator and a clock input coupled to an output of the second oscillator, the second sampler is a D-type Flip-flop comprising a data input coupled to the output of the first oscillator and a clock input coupled to an output of the voltage-controlled oscillator, and a frequency frequencies of the first oscillating signal is higher than a frequency of the second oscillating signal.