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Air-core inductive charging systems offer significant weight, cost and reliability advantages over competing ferrite based solutions at the expense of reduced coupling factor. Acceptable magnetic link efficiencies (>95%) can nonetheless be achieved by operating at MHz frequencies where the coil Q is inherently very high (>1000). We present a design approach for transmit-side power electronics...
In this paper, a fully differential low voltage folded cascode CMOS low noise amplifier for zig-bee based applications in wireless sensor networks is presented. The noise figure can be reduced by various gain enhancement techniques of folded cascode LNA. By using capacitive cross coupling technique for LNA, enhancement in trans conductance and linearity of common gate topology can be achieved. The...
Tunnel transistors are one of the most attractive steep subthreshold slope devices which are being investigated to overcome power density and energy inefficiency exhibited by CMOS technology. There are design challenges associated to their distinguishing characteristic which are being addressed. In this paper the impact of the non-symmetric conduction of tunnel transistors (TFETs) on the speed of...
It makes no doubt in most people's mind that future transportation will become more and more electrical. However the penetration rate of electrification will greatly depend not only on the performance of the system — autonomy being one of the most critical aspects — but also on cost and system reliability. In this paper, a novel system approach for driving 3 phase inverters power stages will be presented...
In this article, a design methodology for DC-DC converters with high insulation capabilities (up to 30kV) is proposed. The objective is to provide a power transmission function for IGBT drivers. To achieve this, a DC-DC full-bridge series-series (FB-SS) resonant converter with a high air gap transformer is selected and studied. This high air gap transformer (loosely coupled transformer (k)) is used...
A new family of two stage op-amps with broadband open loop response is introduced. These have a significant reduction of the DC open loop gain and maintain a high gain at frequencies as low as 1 Hz. This provides them with low DC offset. The proposed circuits are based on the Quasi-Floating Gate (QFG) technique, using a novel implementation for active loads that provides a very low effective resistance...
Ambient Intelligence, and in general, any autonomous rule based system has been found to suffer from cyclic instability. This behaviour is characterized by unwanted oscillations, due to interacting rules within networks of pervasive computing devices. The binary behaviour of each agent is defined via a set of boolean rules, and the behaviour of the system as a whole is given by the ensemble of rules...
We study how to engineer parameters for perfect information transfer in neighbor-coupled spin chains. The 2N-dimensional Hilbert space associated with quantum information transfer over the spin chain can be projected into an N-dimensional subspace, so the Hamiltonian of the system will be reduced to a tridiagonal matrix in a standard basis. The functional relation between the parameters of the spin...
In this paper, we present a new technique to improve the reliability of H-tree SRAM memories. This technique deals with the SRAM power-bus monitoring by using built-in current sensor (BICS) circuits that detect abnormal current dissipation in the memory power-bus. This abnormal current is the result of a single-event upset (SEU) in the memory and it is generated during the inversion of the state of...
3D contactless technology based on capacitive coupling represents a promising solution for high-speed and low power signaling in vertically integrated chips. AC coupled interconnects do not suffer from mechanical stress, and the parasitic load is much reduced when compared to standard DC solutions, such as wire bonding and micro bumps. Communication system based on wireless interconnection scheme...
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