Patent ID: 7613756
Filing Date: 2009-11-03
Classification: G06F

Abstract:
1. A random number generator circuit, comprising: a first resistor having an input and an output, the input being connected to receive a first voltage, the first resistor being defined to add a random noise component to the first voltage; a second resistor having an input and an output, the input being connected to receive a second voltage, the second resistor being defined to add a random noise component to the second voltage; an amplifier having a first input connected to the output of the first resistor and a second input connected to the output of the second resistor, the amplifier being defined to have an output for providing a third voltage that includes a representation of the random noise components added by the first and second resistors; a negative feedback loop defined to control the first voltage to stabilize the third voltage to be output by the amplifier; a positive feedback loop defined to control the second voltage to further stabilize the third voltage to be output by the amplifier; and a voltage controlled oscillator (VCO) having an input connected to the output of the amplifier, the VCO being defined to generate a random signal based on the third voltage that includes the random noise components added by the first and second resistors, the random signal used to set a bit for defining a random number.