Search results for: Arijit Raychowdhury
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IEEE Electron Device Letters > 2018 > 39 > 1 > 139 - 142
An oscillator-based true random number generator (TRNG) is experimentally demonstrated by exploiting inherently stochastic threshold switching in the insulator-to-metal transition (IMT) in vanadium dioxide. Through experimentation and modeling, we show that the origin of stochasticity arises from small perturbations in the nanoscale domain structure, which are then subsequently amplified through a...
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A 6-bit time-based folding matrix multiplication technique for support vector machine (SVM) classification is proposed. A voltage controlled oscillator (VCO) based analog-to-digital converter (ADC) performs in-situ matrix multiplications (MM) along with analog to digital conversion. It also offers a low supply voltage of operation (down to 0.4V) and an input range of 0.8V, drawing a total of 376nA...
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This paper reviews an analog circuit system of capacitively coupled relaxation oscillators whose time evolution can be used to solve the graph coloring problem. These oscillators consist of a series combination of an insulator-metal-transition (IMT) device and a resistance. Such circuits were also demonstrated experimentally using VO2 (Vanadium Dioxide) as the phase transition material. The time evolution...
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2017 IEEE SENSORS > 1 - 3
Heating, ventilation and cooling (HVAC) consumes nearly 50% of electrical energy spent in homes and offices worldwide. To adapt an HVAC system to the dynamic environment and save energy without compromising the comfort level of the occupants, different techniques have been explored to sense the real-time occupancy in rooms, zones and buildings. Among all these approaches, wireless camera-based sensing...
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IEEE Transactions on Circuits and Systems I: Regular Papers > 2017 > 64 > 9 > 2470 - 2480
It is well understood that data-acquisition by distributed sensors and subsequent transmission of all the acquired data to the cloud will produce a “data deluge” in next-generation wireless networks leading to immense network congestion, and data back-logs on the server which will prevent real-time processing and control. This motivates in situ data analytics in energy-constrained wireless sensor...
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With the proliferation of distributed sensors and Internet of Thing end-nodes, aggregate data transfer to the back-end servers in the cloud is expected to become prohibitively large which not only results in network congestion, but also high energy expenditure a the sensor nodes. This motivates in-sensor data analytics that can perform context-aware acquisition and processing of data; and transmit...
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Random number generators (RNG) are a fundamental hardware component in modern cryptographic systems [1]. The generation of random numbers can be subdivided into two classes, pseudo-RNGs and hardware RNGs. In pseudo-RNGs software algorithms are implemented on deterministic hardware but are dependent on a set of initial values or “seed”, which reduces the security. In contrast, hardware RNGs generate...
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In this paper we review recent work on computational paradigms involving coupled relaxation oscillators built using metal-insulator-transition (MIT) devices. Such oscillators made using MIT devices based on Vanadium-Dioxide thin films are very compact and can be realized in hardware. Networks of such oscillators have interesting phase and frequency dynamics which can be programmed to solve computationally...
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With the advancement of technology in the last few decades, leading to the widespread availability of miniaturized sensors and internet-connected things (IoT), security of electronic devices has become a top priority. Side-channel attack (SCA) is one of the prominent methods to break the security of an encryption system by exploiting the information leaked from the physical devices. Correlational...
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A digitally-assisted leakage current supply (LCS) circuit reduces the maximum current demand for analog low-dropout (LDO) voltage regulators to lower the minimum dropout voltage (VDO. MIN), and consequently, enable a wider range of LDO operation for power savings in system-on-chip processor cores. From silicon measurements in a 130nm test chip, the LCS assisted hybrid LDO decreases VDO, MIN by 30–38%,...
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IEEE Transactions on Components, Packaging and Manufacturing Technology > 2017 > 7 > 4 > 533 - 543
Power supply rejection peaking in low-dropout (LDO) voltage regulators can lead to reduced bandwidth and efficiency. This paper presents a new design method by combining power transmission lines (PTLs) with LDOs for enhancing its bandwidth and efficiency. This approach is applicable for LDOs regulating high-speed I/O drivers. The PTL combined with decoupling capacitors on the package or board is used...
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We propose a novel appearance-based gesture recognition algorithm using compressed domain signal processing techniques. Gesture features are extracted directly from the compressed measurements, which are the block averages and the coded linear combinations of the image sensor's pixel values. We also improve both the computational efficiency and the memory requirement of the previous DTW-based K-NN...
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Spin Transfer Torque Magnetic Random Access Memory (STT-MRAM) is an emerging memory technology which exhibits non-volatility, high density and nanosecond read and write times. These attributes of STT-MRAM make it suitable for last level embedded caches. However, the defects and corresponding fault models of STT-MRAM are not as extensively explored as in SRAM and therefore, there is a growing need...
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Conventional CMOS scaling and the Moore's law have been the cornerstone of progress in computing hardware technology. However, with dimensional scaling expected to end soon, there is a pressing need to find the next information processing hardware that can continue to support the technology revolution. Will this hardware solution be an enhanced or an augmented version of MOSFET or a switch based on...
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2016 IEEE International Electron Devices Meeting (IEDM) > 35.5.1 - 35.5.4
With increasing process variation in scaled technology nodes along with voltage and temperature variations and aging degradations, critical timing circuits are impacted which leads to potential loss of performance and yield. In this paper we study the impact of process induced variations on frequency independent min-delay failures in flip-flops in 22nm tri-gate CMOS and demonstrate through novel test-structures...
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Spin Transfer Torque Magnetic Random Access Memory (STT-MRAM) is an emerging memory technology which exhibits non-volatility, high density, high endurance and nanosecond read and write times. These attributes of STT-MRAM make it suitable for last level embedded caches. However, defect models, faults and test architectures for emerging memory technologies are relatively unexplored. This is further...
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Digital low dropout voltage regulators provide digital process synthesiz ability, fast transient response and performance adaptation but lack steady state voltage regulation performance. To overcome this lack of steady state accuracy due to limit cycle oscillations, a hybrid low dropout voltage regulator topology designed in 130 nm CMOS process is presented. In the proposed topology, the operational...
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A fully-digital, single-loop Unified Voltage and Frequency Regulator (UVFR) is designed in 130nm CMOS to provide the correct supply to digital loads to meet a timing criteria. Simultaneously a Tunable Replica Circuit (TRC) based local oscillator is generated from the regulated supply and clocks the load. Measurements show 0.84V to 0.27V range of operation, and 27% supply guardband reduction at iso-performance...
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A hybrid (digital and analog) low dropout regulator (LDO) utilizing switched mode control is designed in 130 nm CMOS for fine grain power management, fast droop recovery and robust small signal regulation of multi-VCC digital loads. The design provides an optimal trade-off of performance and accuracy by switching between a digital and an analog control loop. The hybrid topology achieves robust small...
