A random number generator includes a ring oscillator having an EX-OR gate and four inverters together forming a loop. This loop enters stable state for a start signal having the low level and oscillates for the start signal having the high level. When the start signal has a pulse of a width shorter than...http://www.google.com/patents/US20040264233?utm_source=gb-gplus-sharePatent US20040264233 - Random number generator with ring oscillation circuit
