Patent ID: 7099906
Filing Date: 2006-08-29
Classification: H03B,H03K

Abstract:
1. A generator of a random bit sequence comprising: a biasing circuit; a source of a noisy voltage signal, biased by said bias circuit; an amplification stage generating an amplified signal representative of the sole AC component of said noisy signal; and an output stage electrically in cascade to said amplification stage generating said random bit sequence in function of said amplified AC component; characterized in that said amplification stage comprises: an input low-pass filter extracting the DC component of said noisy signal; a differential amplifier producing said amplified AC component signal, receiving on an non inverting input said noisy voltage signal and on an inverting input said DC component extracted by the input low-pass filter; said output stage comprises: a generator of a square wave signal switching between a high and a low state at every inversion of said amplified AC component signal; and a sampling circuit sampling said square wave signal with a clock signal and generating said random bit sequence.