The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 14, 2018
Filed:
Apr. 25, 2017
Waleed Sami Haddad, San Francisco, CA (US);
Waleed Sami Haddad, San Francisco, CA (US);
Other;
Abstract
An apparatus comprises a light emitting diode (LED) and a phototransistor configured to receive light from the LED and generate an electrical signal comprising shot noise. An amplifier is coupled to the phototransistor and configured to amplify the electrical signal. Sampling circuitry is coupled to the amplifier. For a plurality of temporally spaced sample pairs each defined by two consecutive time points in the amplified signal, the sampling circuitry is configured to determine a difference in amplitude of the amplified signal at each of the two consecutive time points and output a differential sample value indicative of the amplitude difference. The differential sample values for the plurality of sample pairs define a plurality of random numbers.