Apparatus for providing a jittered clock signal and...

Oscillators – Electrical noise or random wave generator

Reexamination Certificate

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C708S250000, C708S251000, C708S255000

Reexamination Certificate

active

10934302

ABSTRACT:
An apparatus for providing a jittered clock signal has a reverse-biased diode. The reversed-biased diode has a leakage current which decreases a reverse voltage on the diode, time-dependent on a shot-noise of the leakage current. The apparatus for providing a jittered clock signal further has a unit for periodically increasing the reverse voltage of the diode to a value, which is above a switching value and the apparatus has a unit for comparing the reverse voltage of the diode to the switching value and for outputting a jittered clock signal dependent on the comparison.

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patent: 6844786 (2005-01-01), Pan et al.
patent: 0 981 081 (2000-02-01), None
Tian, Hui, et al., “Analysis of Temporal Noise in CMOS Photodiode Active Pixel Sensor”, IEEE Journal of Solid-State Circuits, vol. 36, No. 1, Jan. 2001, pp. 92-101.
Petrie, Craig S., et al., “A Noise-Based IC Random Number Generator for Applications in Cryptography”, IEEE Transactions on Circuits and Systems—I: Fundamental Theory and Applications, vol. 47, No. 5, May 2000, pp. 615-621.
Bucci, M., et al., “A High Speed Truly IC Random Number Source for Smart Card Microcontrollers”, IEEE, 2002, pp. 239-242.
Bucci, Marco, et al., “A High-Speed Oscillator-Based Truly Random Number Source for Cryptographic Applications on a Smart Card IC”, IEEE Transactions on Computers, vol. 52, No. 4, Apr. 2003, pp. 403-409.

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