Disclosed is method and chaos circuit for a random number generator comprising: a differential sample and hold circuit portion having a first and a second differential signal input and a first and a second differential signal output, a differential non-linear discriminator circuit portion that applies a differential discrimination function upon the first and the second differential signal output and outputs a first and a second discriminated signal, where the first and the second discriminated signals are also coupled to the first and the second differential signal inputs via a first and a second loop feedback.