Patent ID: 8180816

Claim:
A system comprising: a pseudo random number generator having n memory cells and a period length between 2 n-1 and 2 n ; a control circuit being configured to, from a power-up of the true random number generator on, increase a quality of a pseudo random number output signal of the pseudo random number generator by coupling the pseudo random number generator with n i <n bits of a true random number output signal of a true random number generator per step i of the plurality of steps, and operate the pseudo random number generator in a free-running mode in which the pseudo random number generator is decoupled from the true random number output signal, so that a temporal progression of a total number of bits of the true random number output signal coupled to the pseudo random number generator increases stepwise; and a consumer circuit being configured to use the pseudo random number output signal already between the steps i<I, with ∑ i = 1 I - 1 ⁢ n i < n < ∑ i = 1 I ⁢ n i .