In this paper a new type of parallel computer architecture dedicated to real-time vision is proposed. The proposed architecture is based upon the Beowulf concepti.e. COTS computing nodes interconnected by a high-speed network and running... more
Current automotive electromagnetic compatibility (EMC) standards do not discuss the effect of the driving profile on real traffic vehicular radiated emissions. This paper describes a modeling methodology to evaluate the radiated... more
Energy consumption constraints on computing systems are more important than ever. Maintenance costs for high performance systems are limiting the applicability of processing devices with large dissipation power. New solutions are needed... more
With the increase of electrical/electronic equipment integration complexity, the electromagnetic compatibility (EMC) becomes one of the key points to be respected in order to meet the constructor standard conformity. Electrical drives are... more
This paper describes a wheelchair for physically disabled people developed within the UMIDAM I Project. A dependent-user recognition voice system and ultrasonic and infrared sensor systems has been integrated in this wheelchair. In this... more
This paper presents a global positioning system for an autonomous electric vehicle based on a Real-Time Kinematic Global Navigation Satellite System (RTK-GNSS), and an incremental-encoder odometry system. Both elements are fused to a... more
In this paper, a novel framework for optimizing the caching of popular user content at the level of wireless user equipments (UEs) is proposed. The goal is to improve content offloading over wireless device-to-device (D2D) communication... more
The fundamental configuration of the dc distributed power system (DPS) is cascade connection of converters. In cascaded system impedance problem occurs due to independent design of converters and may make the system unstable. In the... more
The design of secure authentication protocols is quite difficult, considering that varied types of root kits reside in PC's (Personal Computers) to look at user's behavior and to create PCs un-trusted devices. Involving human in... more
This paper presents a theoretical study and design of two techniques used to reduce start-up time (TS) and energy (ES) of Pierce crystal oscillator (XO). An analytical study of precise injection on a crystal resonator is introduced, and... more
This work presents an energy-efficient electrocorticography (ECoG) array architecture for fully-implantable brain machine interface systems. A novel dual-mode analog signal processing method is introduced that extracts neural features... more
The analysis, design, and implementation of a 50-Gb/s transimpedance amplifier (TIA) in a 0.13-μm SiGe BiCMOS process are presented. The proposed TIA, designed for use in a single-channel optical communication network, is comprised of... more
This paper presents the design and implementation of a millimeter-wave (mm-wave) fundamental frequency circularly polarized radiator which employs a multi-port cavity as the core of a high-Q resonator, a power combiner, and an antenna. A... more
A novel high-speed wireless transmitter (TX) architecture is presented that directly transforms incoming data bits into high-order 4 M -quadrature amplitude modulation (QAM) constellation by adding multiple quadrature phase shift keying... more
This paper provides an overview of broadband terahertz antenna elements and arrays for integrated communication systems. The fundamental challenges of integrated on-chip and off-chip antenna design, the trade-offs between performance... more
A wideband, low-loss balun-based differential power splitter is studied. The use of lumped double-tuned baluns as key building blocks within a splitter leads to a wideband operation, while avoiding signal crossovers and the detrimental... more
A study of operating condition and design methods is presented that enables the amplifiers to achieve the upper limit of their power gain at frequencies close to the device f max .Using the gain-plane approach, the necessary and... more
A CMOS 170-GHz fundamental-frequency transmitter (TX) realizing the 8PSK modulation scheme directly in the RF domain is presented. The use of direct RF modulation obviates the need for high-resolution high-speed mixed-signal blocks. The... more
A Millimeter-Wave Partially Overlapped Beamforming-MIMO Receiver: Theory, Design, and Implementation
This paper presents an analysis and design of a partially-overlapped beamforming-MIMO architecture capable of achieving higher beamforming and spatial multiplexing gains with lower number of elements compared to conventional... more
This paper presents a 53-61GHz low-power chargepump integer-N type-II PLL, employing a class-D V-band VCO. Transistors in the VCO enter deep triode region to achieve low DC power and phase noise. Pros and cons of the triode region are... more
IntroductionBi-directional brain-computer interfaces (BD-BCI) to restore movement and sensation must achieve concurrent operation of recording and decoding of motor commands from the brain and stimulating the brain with somatosensory... more
In this paper, we present a new analytical approach for computing the ramp response of an RLC interconnect line with a pure capacitive load. The approach is based on the two-port representation of the transmission line and accounts for... more
Cortical stimulation via electrocorticography (ECoG) may be an effective method for inducing artificial sensation in bi-directional brain-computer interfaces (BD-BCIs). However, strong electrical artifacts caused by electrostimulation may... more
This paper presents the design of a high efficiency, low THD, 5.7GHz fully differential power amplifier for wireless communications in a standard 0.18µm CMOS technology. The power amplifier employs a fully differential class-E topology to... more
Fully-implantable, bi-directional brain-computer interfaces (BCIs) necessitate simultaneous cortical recording and stimulation. This is challenging since electrostimulation of cortical tissue typically causes strong artifacts that may... more
This paper presents an ultra-low power mixedsignal neural data acquisition (MSN-DAQ) system that enables a novel low-power hybrid-domain neural decoding architecture for implantable brain-machine interfaces with high channel count.... more
This paper presents a detailed empirical study and analytical derivation of voltage wave-form and energy dissipation of global lines driven by CMOS drivers. It is shown that at high clock frequencies where the output voltage at the... more
An inductorless MedRadio (413∼419 MHz) OOK transceiver for an implantable brain-machine interface (BMI) in 180 nm CMOS is presented. An event-driven supply modulation (EDSM) technique is introduced in the receiver to lower the power... more
This paper presents a spectrally-weighted balanced truncation technique for RLC interconnects, when the interconnect circuit parameters change as a result of variations in the manufacturing process. The salient features of this algorithm... more
In this paper the design and analysis of a novel non-uniform fully differential distributed amplifier is presented. The gainbandwidth product of the proposed amplifier designed in a 0.18µm standard CMOS process reaches a record level of... more
The goal of this study is to estimate the thermal impact of a titanium skull unit (SU) implanted on the exterior aspect of the human skull. We envision this unit to house the front-end of a fully implantable electrocorticogram (ECoG)based... more
Scaling the minimum feature size of VLSI circuits to sub-quarter micron and the clock frequency to 2GHz has caused the crosstalk noise to become a serious problem, degrading the performance and reliability of high speed integrated... more
W E wireless transceivers are capable of carrying extremely high data rates for up to 250 feet with relatively small transmit power. Furthermore, the spread spectrum characteristics of UWB wireless systems, and the ability of the UWB... more
Bi-directional brain-computer interfaces (BD-BCI) to restore movement and sensation must achieve concurrent operation of recording and decoding of motor commands from the brain and stimulating the brain with somatosensory feedback.... more
Brain-computer interfaces (BCIs) have shown promising results in restoring motor function to individuals with spinal cord injury. These systems have traditionally focused on the restoration of upper extremity function; however, the lower... more
CMOS Phase-locked loops (PLL) are ubiquitous in RF and mixed-signal integrated circuits. A general comprehensive stochastic model of the power/ground (P/G) noise in VLSI circuits is presented. This is followed by calculation of the phase... more
Objective. Electrocorticogram (ECoG)-based brain-computer interfaces (BCIs) are a promising platform for the restoration of motor and sensory functions to those with neurological deficits. Such bi-directional BCI operation necessitates... more
Objective. State-of-the-art invasive brain-machine interfaces (BMIs) have shown significant promise, but rely on external electronics and wired connections between the brain and these external components. This configuration presents... more
MedRadio 413-419 MHz inductorless transceiver (TRX) for an implantable brain-machine interface (BMI) in a 180 nm CMOS process is presented. Occupying 5.29 mm 2 of die area (including pad ring), this on-off-keying (OOK) TRX employs a... more
Bi-directional brain-computer interfaces for the restoration of movement and sensation must simultaneously record neural signals and deliver cortical stimulation. This poses a challenge since stimulation artifacts can be orders of... more
Bi-directional brain-computer interfaces (BCIs) require simultaneous stimulation and recording to achieve closed-loop operation. It is therefore important that the interface be able to distinguish between neural signals of interest and... more
Two brain signal acquisition (BSA) front-ends incorporating two CMOS ultra-low power low noise amplifier arrays and serializers operating in MOSFET weak inversion region are presented. To boost the amplifier's gain for a given current... more
A fully implantable brain-computer interface (BCI) can be a practical tool to restore independence to those affected by spinal cord injury. We envision that such a BCI system will invasively acquire brain signals (e.g. electrocorticogram)... more
Motor rehabilitation using brain-computer interface (BCI) systems may facilitate functional recovery in individuals after stroke or spinal cord injury. Nevertheless, these systems are typically ill-suited for widespread adoption due to... more
In this paper we present the design and analysis of a distributed regenerative frequency divider (DRFD) based on a novel distributed single-balanced mixer. Artificial transmission lines are incorporated in the distributed single balanced... more
A 64-channel bioelectric signal acquisition system incorporating a CMOS ultra-low power amplifier array and serializer integrated circuit (IC) is presented. Each amplifier within the array employs a complementary differential topology... more