Patent ID: 6469576
Filing Date: 2002-10-22
Classification: H03F

Abstract:
An amplifier circuit for a physical random number generator for amplifying a very small signal to generate a physical random number signal, comprising:a differential amplifier having a pair of first differential input terminals including a first non-inverted input terminal and a first inverted input terminal, and a pair of second differential input terminals including a second non-inverted input terminal and a second inverted input terminal for receiving input signals respectively from said pairs of first and second differential input terminals and for producing differential output signals in a form of a linear combination of said input signals, the differential amplifier having a first inverted output terminal and a first non-inverted output terminal to output the differential output signals; and a differential low-pass filter circuit including a pair of differential input terminals and a pair of differential output terminals for receiving differential signals to pass therethrough low-frequency components respectively thereof and for outputting differential output signals, said differential low-pass filter circuit disposed between said pair of first differential output terminals and said pair of first differential input terminals to form a feedback loop.