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In this paper, we try to maximize the power of ultra-wideband signal “UWB” sent to the target without breaching the restriction limits of the Federal Communications Commission “FCC”. The signal is a series of monocycle Gaussian pulses, characterized by the frequency center “FC”, Pulse Repetition Interval “PRI”. And the amplitude “A”. Maximizing the signal power under the FCC constraints: get a PSD...
In this study a novel architecture of Ultra Wide Band generator is explained. This architecture is the major important component in the generator Ultra Wide band communications systems. The new generator is consists of oscillator, multiplier and triangular pulse generator. This new study of generator is consists by multiply the triangular pulse signal envelope with a sinusoidal signal in the aim to...
This paper describes the design and the optimization of a rectenna in ISM band, dedicated to wirelessly supplying RFID's sensors, to replace or recharge existing batteries. The circuit is based on a double voltage rectifier designed and optimized at 2.45GHz with ADS software. We detail a new methodology to design and optimize a rectenna circuit. As a result, excellent performance is achieved in terms...
The Ultra Wide Band (UWB) is a technical of radio transmission which consists of using signals whose spectrum is spread out over a broad frequency band, typically ranging from MHz to several GHz frequencies. It was at first used for radar applications then applied in telecommunication applications, thus arousing a growing interest within the academic and industrial community. In a UWB radar system,...
In this paper, a review is given of present state of the art about the concept of wireless power transmission i.e., transmitting power as microwaves from one place to another in order to reduce losses during the transmission and distribution of electrical power or also to deliver energy in location where conventional wires are expensive, inconvenient or impossible. This concept is known as Microwave...
The resting state dynamics of the brain shows robust features of spatiotemporal pattern formation but the actual nature of its time evolution remains unclear. Computational models propose specific state space organization which defines the dynamic repertoire of the resting brain. Nevertheless, methods devoted to the characterization of the organization of brain state space from empirical data still...
This article consists on measuring bio-impedance that reflects biological and clinical information useful for the tissue characterization and diseases detection etc…The objective of this article is to adapt the programmable impedance meter AD5933/34EBZ for measuring bio-impedance by the tetra-polar configuration. This method allows direct measurement of the impedance of the sample without the electrode...
The aim of this work is to determine the frequency of an UWB (Ultra Wind Band) wave at which the wave can cross the biological tissue with limited losses and deformation. The biological tissue which is characterized by its thickness, its relative dielectric constant and its conductivity, is a sample of fat, localized at a distance of the antenna source which guarantees the inexistence of the attenuation...
This article describes the prototype of the digital communication system based on the XBee module. It consists on a universal system that transmits all type of data including the medical information such as Electrocardiogram (ECG). To validate this system, we have chosen to transmit the ECG from a computer to another through the XBee modules just to evaluate the quality of the wireless communication...
This paper describes a micro power amplifier for neural signal recording. We describe an amplifier using a differential pair as input stage. Given that neural amplifiers must include differential input pair to achieve a high common-mode rejection ratio (CMRR). The amplifier has been designed in the AMS 0.35 mum, 3-metal, 2-poly, n-well standard CMOS process. The amplifier current consumption is 4...
This paper describes a micro power amplifier for neural signal recording. We describe an amplifier using a differential pair as input stage. Given that neural amplifiers must include differential input pair to achieve a high commonmode rejection ratio (CMRR). The amplifier has been designed in the AMS 0.35 mum, 3-metal, 2-poly, n-well standard CMOS process. Its current consumption is 4.61 muA at plusmn1V...
New technologies tend to improve our everyday life and to make it easier and this is shown especially within the framework of the medical analyses where the doctor always seeks the ease of its patient. In this context, a radar UWB was designed in order to extract, remotely and without any direct contact by electrodes, the rate of heartbeat of a patient. This radar contains a transmitting part and...
This paper presents an assimilation of the transfer function of a differential pair of MOS transistors to a hyperbolic tangent function. Also it prove, that the characteristic of transfer function of a MOS differential pair is symmetrical and that is close to the one of the bipolar transistors differential pair (It represent the transfer function of this differential pair; it describe the output signal...
Hearing is the feeling thanks to which, the external world is perceived by the intermediary of specialized sensors, sensitive to the sound vibrations of the air (sound waves). These waves must pass by a whole perception and transmission chain including the outer ear, the middle ear and the inner ear, to arrive finally at the auditive nerve. At each level of this chain, an embarrassment or a rupture...
The electronic implants were introduced in the human body further to a surgical operation for the neurological dysfunctions treatment as well as the help or the replacement of the organs which have difficulties. For practical and medical reasons, implants have to communicate without wire with the external world. Most of them use an inductive link to supply in power and data. In this paper, we propose...
This paper presents an innovative modeling method for the mutual inductance of two magnetically coupled coils in an inductive link, ensuring efficient energy and data transmission in implantable electronic devices. An electrical model, which can be used within a circuit simulator, directly takes into account the lateral and longitudinal displacements between the external coil (transmitter) and the...
In this paper, we will focus exclusively in the obtention of optimum power designs, using the (gm/ID) methodology. The introduction of a simple, gain bandwidth driven, automatic design algorithm for OTA is used as a starting point for the review of more advanced design methodology. This review leads to an automatic synthesis algorithm developed in MATLAB which systematically transits from high level...
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