Texas Instruments Corporation

Maxim Integrated Products, Inc.

Irfan Azam Chaudhry

Mounir Fares

Ching-Yuh Tsay

Alexander Bugeja

Abdellatif Bellaouar

Eric G Soenen

Sung Ung Kwak

Jianxin Ma

Steven Chacko

Liyong Chen

Various embodiments of the present invention relates to systems, devices and methods of detecting tampering and preventing unauthorized access by incorporating programmability and randomness into a process of coupling, driving and sensing conductive wires that are arranged above sensitive areas in a secured system. Such a tampering detection system comprises a security mesh network, a random number generator, a security controller and a security monitor. The security mesh network includes a plurality of security elements made from the conductive wires. The security controller selects a subset of security elements, forms a security array, and generates a driving stimulus. The security monitor selects a SENSE node, monitors an output at the SENSE node, and generates a flag signal indicating the presence of a tampering attempt. Programmability and randomness are introduced to at least one of the system parameters including array configuration, driving stimulus, SENSE node, and detection mode via random numbers.

Systems and methods for detecting and thwarting unauthorized access and hostile attacks on secured systems

Methods and apparatus to lock a phase lock loop to a spindle motor are disclosed. An example controller comprises a counter to determine a period of an operating signal received from a motor, an oscillator to generate a control signal based on an input signal, and an initializer to generate the input value based on the period, wherein the input value causes the oscillator to generate the control signal having the same phase as the operating signal.

Methods and apparatus to lock a phase lock loop to a motor

An averaging circuit includes: input signal nodes for providing input signals ; a multiplexing circuit coupled to the input signal nodes for switching between the input signals to create a time waveform; a low pass filter coupled to an output of the multiplexing circuit for filtering the time waveform to create an average signal; and an average replication circuit coupled to an output of the low pass filter

Circuit for precise measurement of the average value of the outputs of multiple circuit unit elements

A segmented digital-to-analog converter includes: upper segments , and ; a thermometer decoder ; a randomizing circuit coupled between the thermometer decoder and the upper segments , and for randomizing an output of the thermometer decoder ; a divider location selector circuit coupled between the randomizing circuit and the upper segments , and for choosing a selected segment from the upper segments , and ; and lower segments coupled to the selected segment.

Segmented high speed and high resolution digital-to-analog converter

A skewless differential switching circuit uses skewless switching elements to convert complementary signals with skew into complementary output signals with minimal time skew between the output signals and with equalized rise and fall times of the output signals for minimum harmonic distortion.

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Plano, TX, United States of America

Irfan Azam Chaudhry