Because of its moderate cost in terms electronics, resonant sensing has become commonplace the context MEMS and NEMS devices. It is usual to drive such resonators below critical open-loop Duffing amplitude, above which oscillations unstable. However, when scaling sensors down NEMS, nonlinearities may occur at very low amplitudes, making difficult detect. This paper describes a general way compute amplitude operation for beam resonators, before it focuses on closed-loop Duffing-type...

In the field of resonant nano-electro-mechanical system (NEMS) design, it is a common misconception that large-amplitude motion, and thus large signal-to-noise ratio, can only be achieved at risk oscillator instability. present paper, we show very simple closed-loop control schemes used to achieve stable motion structure even when jump resonance (caused by electrostatic softening or Duffing hardening) in its frequency response. We focus on case accelerometer sensing cell, consisting...

This article proposes a robust method for the synthesis and design of optimal linear group delay filters with prescribed bandwidth dispersion properties. The proposed are based on cascade second-order all-pass filter cells, which all parameters optimized in order to reach desired wideband characteristic positive slope. Compared previously published method, approach offers appropriate initialization enabling convergence aiming solution. method's robustness proved through 21-cells synthesis,...

Summary This article describes the design of integrated linear group delay filters for analog signal processing (ASP) applications and their implementation through constant‐resistance lattice bridged‐T networks. Unlike previously published works, our method uses a recursive procedure as basis synthesis suitable transfer function. Thanks to this method, with more characteristic flat magnitude response can be obtained. Two are designed in 0.13‐μm BiCMOS technology demonstrate method: balanced...

Summary This article describes the design of a tunable positive slope linear group delay filter dedicated to analog signal processing applications. The designed is composed eight second‐order all‐pass cells which have been optimized obtain highly global characteristic over specified bandwidth for dispersion. Each these with G m ‐ C topology fit ideal high efficiency. Based on sensitivity analysis topology, possibility tuning highlighted. has achieved ST CMOS 55 nm technology and maximum 2.5...

Passive metamaterials have yet to be translated into applications on a large scale due in part their limited bandwidth. To overcome this limitation many authors suggested coupling non-Foster circuits. However, up now, the number of convincing demonstrations based has been very limited. This paper intends clarify why progress so slow, i.e., fundamental difficulty making truly broadband and efficient metamaterial. end, we consider two families metamaterials, namely Artificial Magnetic Media...

The paper presents the design of two dispersive filters (also called phasers) dedicated to Analog Signal Processing (ASP) applications. Possible ASP applications targeted for these are also proposed: analog pulse compression radar, chirp Fourier transformer and frequency discriminator. In past decades, have been implemented with Surface Acoustic Wave (SAW) filters, having a reduced bandwidth leading poor resolution in Consequently, designing larger is significant progress this what proposed...

Microwave imaging of nanoelectronic devices has turned a simple reflection coefficient measurement, usually carried out by 50-Ω vector-network analyzer, into high-impedance instrumentation challenge. Interferometry-based reflectometers (IBR) have been found to be successful solutions in addressing this However, such do not consider high impedance and frequency as well minimization environment variations comprehensive manner. In paper, these aspects are addressed jointly through the proposal...

This article proposes procedures for the design and synthesis of wideband filter networks integrated analog signal processing (ASP) applications. In this context, filters with engineered group delay are required. state-of-the-art ASP, is solved using discrete devices or system in package solutions like SAW filters. The proposal intends to generate network topologies compatible an implementation circuit technologies. An example doubly terminated ladder presented illustrate proposal....

This paper presents a wideband compact phaser with linear group delay, key block to many Analog Signal Processing applications as Real-Time Fourier Transforming systems (RTFT). The phaser, designed in 130 nm BiCMOS technology, delay dispersion of 3 ns, layout area only 30 μm by 330 and power consumption 7.2 mW. Between 300 MHz 2.5 GHz, the linearity error is lower than 5%. enhanced has been obtained thanks an association active first-order all-pass filters second-order filters. benefit using...

This paper investigates the design of switched-capacitor filters for reconfigurable frequency synthesizer dedicated to FMCW radar. Simulations mixing electronics level and systems demonstrates that it is possible generate a chirp waveform with performances close one obtained an ideal continuous-time filter. simulated in simplified radar model evaluate effects imperfection on The motivation this work digitally controlled source based free-running VCO.

This paper presents the modeling and optimization of a frequency synthesizer dedicated to FMCW radar applications. based on type-I PLL advantages simplified architecture with less potential electronic drawbacks. A methodology optimize filter loop is proposed in order obtain required smoothed characteristic correct VCO distortion.

The paper presents the design of a dispersive filter for an analog pulse compression radar. architecture radar is presented with its equations, limitations, trade-off and comparison more traditional FMCW In past decades, matched has been implemented SAW filters, having reduced bandwidth then poor resolution. Here designed passive instead SAW. described, measured, compared to state-of-the-art filter. use wideband paves way better signal-to-noise ratio power consumption counterpart. measured...

This paper presents a broadband high-Q tunable negative inductor based on gyrator topology. In order to reduce the risk of instability and increase circuit bandwidth, simple inverters are used as transconductance amplifier. A complete stability analysis careful design details using SOI 180 nm technology presented. Post-layout simulations results show inductance variation from -24 nH -13.7 nH. For bandwidth 10 MHz 1 GHz, value error remains under 12.5 %. Circuit power consumption is 16 mW;...

Studies on cardiovascular diseases such as pulmonary arterial hypertension (PAH) rely widely research in rodents and particularly rat models. In this context, heart rate modulation is of critical interest. However, the lack pacing systems adapted to small mammals a major limitation for scientific advancements. Herein, we present an FPGA-based prototype programmable pulse generator capable delivering different waveforms stimulate right atrium. To test our system, restored physiological 300...

The ability of adjustment the central frequency a Gm-C resonator in GaAs technology is discussed. First, it shown that whatever technology, desired quality factor can be reached through an appropriate sizing transconductance values, by adding external feedback capacitor amplifiers. Then, demonstrated must made preferentially specific transconductance. Finally, because technologies varying values leads to current offsets which could detrimental performances, maximal allowed are determined. To...

La rentrée 2012 avait été le cadre d'une réforme de l'enseignement l'électronique intégrée au sein la majeure MNE (Micro et Nano Electronique) à Supélec. Les objectifs étaient proposer une nouvelle forme d'enseignement pratique moyen d'un projet long, regrouper un ensemble cours dans cohérent, faire intervenir tous les enseignants l'équipe auprès des élèves dès rentrée, surtout maximum manière remotiver autour discipline qui n'est pas toujours très mode monde numérique actuel. Cet...

La rentrée 2012 a été le cadre d’une réforme de l’enseignement l’électronique intégrée au sein la majeure MNE (Micro et Nano Electronique) à Supélec. Les objectifs étaient proposer une nouvelle forme d’enseignement pratique moyen d’un projet long, regrouper un ensemble cours dans cohérent, faire intervenir tous les enseignants l’équipe auprès des élèves dès rentrée, surtout maximum aux manière remotiver autour discipline qui n’est pas toujours très mode monde numérique actuel. L’évaluation...

In the present paper, we a testbed appropriate for evaluation of bandwidth enhancement effective permeability metamaterial when non-Foster circuits are used. The proposed methodology is used split ring resonator sample negative inductor