Random binary number generator

Details Random binary number generator Random binary number generator

1997-12-05

1999-10-05

Malzahn, David H.

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

708255, G06F 758

Patent

active

059615770

ABSTRACT:
A random number generator includes a plurality of fully differential amplifiers (30) configured as a ring oscillator (22). The output of the ring oscillator (22) is input to a comparator/latch circuit (32) for determining the zero crossing for the ring oscillator. The ring oscillator is a self-oscillating structure that has an oscillation frequency with jitter superimposed thereon. This jitter is a result of the internal thermal noise associated with the integrated circuits that are utilized to realize the amplifiers (30). Each of the amplifiers (30) that make up the ring oscillator operate on a substantially constant current and are subsequently isolated from changes in the power supply. As such, the variations in the frequency thereof are caused solely by thermal noise. The comparator/latch circuit (32) is operable to compare the difference on the output of the last stage of the ring oscillator (22) and the output of the comparator/latch (32) is then sampled by a CPU (12) that is operated on a separate master clock (18). This allows the master clock (18), upon which the sample operation is based, to be completely separate from the ring oscillator (22).

REFERENCES:
patent: 4799259 (1989-01-01), Ogrodski
patent: 5117380 (1992-05-01), Tanagawa
patent: 5706218 (1998-01-01), Hoffman

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