The University of Texas System

Other

The Whisper Company

Benito R Fernandez

Michael D Bryant

Shouli Yan

Zhaohong Wu

Brian R Remy

Ashish Seth

Alejandro S Fernandez-Spadaro

A system and a method of determining persistent presence of an authorized user while performing allowed operations on an allowed resource of the system while satisfying certain context-sensitive restrictions are disclosed. The system receives a request from a user to authenticate him/her. The system authenticates the user using biometric information of the user or any other authentication mechanism in a given context-sensitive restriction. If the user is authenticated, then the system allows the user to perform the allowed operation using the allowed resources in the context-sensitive restriction. If the authentication fails indicating that the user is an unauthorized user, then the system initiates a resolution process to halt or terminate the allowed operation to restrict or obfuscate the allowed operation from being accessed by the unauthorized user. In one embodiment, the system comprises an External Companion Device (ECD) paired with the system to perform the authentication and manage the allowed.

System and method of determing persistent presence of an authorized user while performing an allowed operation on an allowed resource of the system under a certain context-sensitive restriction

A method to tune electronic devices in general using R/2R ladder networks to obtain fixed or variable accurate properties that may include, but are not limited to resistance, current, voltage, and/or timing. As a particular application, a method for internally calibrating a digital-to-analog converter is shown in detail. The DAC uses an extended R/2R ladder to improve the converting accuracy by mapping the extended bits into the original bits. A mapping matrix is maintained, which can be rewritten by an internal calibration process.

Method and apparatus for internally calibrating mixed-signal devices

An apparatus for solving time-continuous differential equations is disclosed. The apparatus includes a group of hybrid integrators interconnected to each other. Each one of the hybrid integrators includes an analog integrator, a conversion logic and multiple digital registers. The analog integrator generates an analog output, and the conversion logic along with the digital registers converts the analog output to a digital output. The analog output and the digital output are then combined to yield an integrated output. The integrated output is fed to the hybrid integrators within the group.

Apparatus for solving differential equations

A mixed-signal system for performing Taylor series function approximations is disclosed. The mixed-signal system includes a digital-to-analog converter (DAC), multiple resistor-to-resistor (R2R) ladders, various digital registers, a digital processor and an analog integrator. The digital processor calculates coefficients F, F, F, F, F, Fof a Taylor series equation and calculates distance functions. The digital processor also includes a digital register for storing a magnitude scaling factor &#x3c6;(x,y) of the Taylor series equation. The DAC control register uploads a lead term F(x,y) of the Taylor series equation from the digital processor to the DAC. The first-order digital registers controls resistances of the R2R ladders. The second-order digital registers uploads coefficients F, F, F, F, Fof the Taylor series equation from the digital processor to the DAC. The analog integrator adds outputs from the DAC and the R2R ladder to generate approximation results for the Taylor series equation.

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Austin, TX, United States of America

Benito R Fernandez