Electrical computers: arithmetic processing and calculating – Electrical analog calculating computer – Particular function performed
Reexamination Certificate
2006-02-28
2006-02-28
Mai, Tan V. (Department: 2193)
Electrical computers: arithmetic processing and calculating
Electrical analog calculating computer
Particular function performed
C708S003000, C708S255000
Reexamination Certificate
active
07007060
ABSTRACT:
A method and circuit is presented for generating a random bit stream based on thermal noise of a Complementary Metal Oxide Semiconductor (CMOS) device. A circuit implementing the invention preferably includes at least a pair of identically implemented thermal noise generators whose outputs feed a differential amplifier. The differential amplifier measures and amplifies the difference between the noise signals. A sampling circuit compares the difference with a threshold value that is selected to track with process/voltage/temperature variations of the noise generator circuits to output a binary bit having a bit value determined according to the polarity of the noise difference signal relative to the threshold value. The sampling circuit may be clocked to generate a random bit stream.
REFERENCES:
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patent: 6070178 (2000-05-01), Anderson et al.
patent: 6195669 (2001-02-01), Onodera et al.
patent: 6571263 (2003-05-01), Nagai
patent: 6857003 (2005-02-01), Saito
patent: 6862605 (2005-03-01), Wilber
Agilent Technologie,s Inc.
Mai Tan V.
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