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Capacitive Micro-Accelerometer digital feedback system was developed using the theory of second-order Σ-Δ modulator. The second-order mechanical gauge outfit behaves as two integrators in second-order Σ-Δ modulator and the number of bits of the quantizer is 1 bit. Continuous-time model of the gauge outfit was transformed to discrete-time model based on the IIR theory and the quantizer linear model...
In this paper, a pipelined implementation of a Hessenberg-based input balanced realization is derived, which is realized by placing the delay elements in the lower path and the upper path alternately. The proposed pipelined structure is canonical in the sense that no extra delay is needed. For an Nth order filter, the proposed structure requires 5N −1 multipliers, which has two less multipliers than...
This paper presents a direct identification method for linear parameter varying models described by partial differential equations in an input-output setting. The continuous space-time model is firstly rewritten as a multiple-input single-output model. The continuous filtering operations are reformulated as a discrete convolution product and a refined instrumental variable technique is developed to...
Determining the Noise and Signal Transfer Functions (NTF and STF) of a Continuous-Time Delta-Sigma Modulator (CTDSM) is an important aspect of the design verification process. In several practical CTDSM designs, like those with Switched Capacitor (SC) and Return-to-Open (RTO) feedback DACs, the loop filters are time varying, rendering traditional methods incorrect and/or time consuming. In this work,...
This paper presents a multi-bit, continuous time delta-sigma modulator with 20 MHz bandwidth implemented in 65nm CMOS for cellular communication. The modulator features a third order, single loop filter and a 4-bit internal quantizer operating at 640 MHz. The DACs are resistive for lower thermal noise compared to the current-steering DACs and nonreturn-to-zero DAC pulse is used to reduce the clock...
In this paper the command governor-based model reference control architecture is developed and analyzed for uncertain dynamical systems in the presence measurement noise and actuator dynamics. Specifically, the command governor is a dynamical system that adjusts the trajectory of a given command in order to enable an uncertain system to be able to follow an ideal reference system capturing a desired...
This paper considers the problem of inferring the structure and dynamics of an unknown network driven by unknown noise inputs. Equivalently we seek to identify direct causal dependencies among manifest variables only from observations of these variables. We consider linear, time-invariant systems of minimal order and with one noise source per measured state. If the transfer matrix from the inputs...
A fourth-order Chebyshev high-pass filter (HPF) that achieves input-referred noise of 3nV/√Hz, MTPR greater than 72dB, and power consumption of less than 81mW with 0.7mm2 area in 28nm CMOS is presented. Area and power reductions are realized via a mixed-signal filter topology.
This paper is concerned with the design and optimization of continuous-time active-RC and gm-C filters. We demonstrate how we can maximize the filters' dynamic range (DR) for a given voltage swing, area and power consumption. Using closed-form symbolic expressions, the optimization problems are formulated as geometric programs (GPs) and mixed-integer GPs (MIGPs) that can be quickly solved to find...
In this work, the problem of pole identification of discrete-time single-input single-output (SISO) linear time-invariant (LTI) systems directly from input-output data is considered. The solution to this nonlinear estimation problem is derived in form of the general Bayesian estimation framework, as well as a practical approximate solution by application of statistical linearization. The derived direct...
The aim of this paper is to propose a computationally efficient technique for the identification of stochastic biochemical networks, involving only zero and first order reactions, from distribution measurements of the cell population. The moments of the species in such networks evolve according to an affine system, hence the use of grey-box identification methods is suggested. The performance of existing...
The present work aims at improving the performance of robust and smooth self-scheduled controllers in the framework of structured H∞ design. The developed procedure exploits multi-model and multi-channel capabilities of a MATLAB-based tool hinfstruct in the design of robust and self-scheduled flight control systems. In this approach, both controller and gain-scheduling architectures are defined a...
This paper tackles the problem of experiment design in system identification using elementary fractional models. It is based on a frequency domain approach and answers the question: what is the best sinusoidal input signal maximizing the D-optimality criterion of the Fisher information matrix in different contexts? First, a single parameter is assumed to be unknown (any of the parameters of the elementary...
In signal enhancement applications, a reference signal which provides information about interferences and noise is desired. It can be obtained via a multichannel filter that performs a spatial null in the target position, a so-called target-cancelation filter. The filter must adapt to the target position, which is difficult when noise is active. When the target location is confined to a small area,...
In this paper we compare two versions of fourth-order band-pass (BP) filter section realized as coupled structure, having negative feedback around two Biquadratic sections in cascade, usually designated as Biquartic section (i.e. it is the fourth-order band-pass section). The frequency response of a filter is subject to vary from the nominal values due to the effects of aging, changing working conditions,...
This paper presents a comparison between fractional order controllers and integer order controllers. The well-known PID is the integer order controller chosen whereas the generalized PID and the CRONE (“Commande Robuste d'Ordre Non Entier” which stands for fractional order robust controller) are the fractional order controllers studied. Another big difference between these controllers is that the...
In order to improve performance of high-speed power line communication (PLC) using OFDM (Orthogonal Frequency Division Multiplexing), compensation of the influence of additive impulsive noise is required. In this paper, the scheme to make precise channel estimation under impulsive power line channel is proposed. Although many schemes to improve influence of the additive impulsive noise are proposed,...
In this paper a comparison of analog versus digital information is given, where the superior noise resilience of digital signals is shown to necessitate digital signalling for modern high-speed signaling environments. Non-idealities that are analog in nature are shown to necessitate ADCs in the digital signal path, which allow for signal recovery in the digital domain. A brief discussion of the Flash...
This paper investigates the performance of DC-DC PWM based buck-boost converter with two degree-of-freedom (2 DOF) control to meet the loop robustness goals as well as to shape the output voltage response according to requirement. The design technique of this controller is simpler than that of the robust control techniques, such as H∞, control, μ-synthesis, applied in literature for converters. Moreover,...
With an objective to improve the convergence characteristics of nonlinear active noise control (ANC) systems, this paper proposes a discrete cosine transform based adaptive algorithm for ANC. The performance of the new algorithm in terms of speed of convergence has been compared with that of the filtered-s least mean square algorithm. The improved convergence of the new algorithm is evident from the...
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