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13
Fullchip harmonic balance
 Proceedings of the IEEE Custom Integrated Circuits Conference
, 1997
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Tools and Methodology for RF IC Design
, 1999
"... We describe powerful new techniques for the analysis of RF circuits. Nextgeneration CAD tools based on such techniques should enable RF designers to obtain a more accurate picture of how their circuits will operate. These new simulation capabilities will be essential in order to reduce the number o ..."
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We describe powerful new techniques for the analysis of RF circuits. Nextgeneration CAD tools based on such techniques should enable RF designers to obtain a more accurate picture of how their circuits will operate. These new simulation capabilities will be essential in order to reduce the number of design iterations needed to produce complex RF ICs. 1 Introduction Design methodology and superior computeraided design tools are key to success in the integrated circuit (IC) business. They are particularly important in the case of radiofrequency (RF) IC applications, where the digital IC divideandconquerdesign style, based on partitioning by functional blocks and abstraction levels, does not apply. The goal of an RF designer is to get a manufacturable design that meets the specifications with minimum cost, under severe timetomarket constraints. Unlike traditional discretecomponent RF design, prototyping is practically impossible, and the validation of a design can only be done b...
Nonlinear distortion analysis via linearcentric models
 in Proc. Asia South Pacific Design Automation Conf
"... AbstractAn efficient distortion analysis methodology is presented for analog and RF circuits that utilizes linearcentric circuit models to generate individual distortion contributions due to the various circuit nonlinearities. The pernonlinearity distortion results are obtained via a straightfor ..."
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AbstractAn efficient distortion analysis methodology is presented for analog and RF circuits that utilizes linearcentric circuit models to generate individual distortion contributions due to the various circuit nonlinearities. The pernonlinearity distortion results are obtained via a straightforward postsimulation step that is simpler and more efficient than the Volterra series based approaches and do not require the high order device model derivatives. For this reason the order of analysis can be significantly higher than that for a Volterra series implementation while fully accounting for all nonlinearity effects. The proposed methodology is not restricted to weakly nonlinear circuits, but can also analyze pernonlinearity distortion for active switching mixers and switch capacitor circuits when they are modeled as periodically timevarying weakly nonlinear systems. While Volterra series have also been attempted for this same class of circuits, the requirement of device models for all of the high order model derivatives makes such analysis somewhat impractical. The proposed methodology provides important design insights regarding the relationships between design parameters and circuit linearity, hence the overall system performance. Circuit examples are used to demonstrate the efficacy of the proposed approach, and interesting insights are observed for RF switching mixers in particular. I.
MEASURING THE HIGHER ORDER SINUSOIDAL INPUT DESCRIBING FUNCTIONS OF A NONLINEAR PLANT OPERATING IN FEEDBACK
"... Abstract: In this paper two measuring techniques are presented for measuring the ..."
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Abstract: In this paper two measuring techniques are presented for measuring the
Volterra Series Approach For Nonlinear Aeroelastic Response Of 2D Lifting Surfaces
, 2001
"... The problem of the determination of the subcritical aeroelastic response and flutter instability of nonlinear twodimensional lifting surfaces in an incompressible flowfield via Volterra series approach is addressed. The related aeroelastic governing equations are based upon the inclusion of s ..."
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The problem of the determination of the subcritical aeroelastic response and flutter instability of nonlinear twodimensional lifting surfaces in an incompressible flowfield via Volterra series approach is addressed. The related aeroelastic governing equations are based upon the inclusion of structural nonlinearities, of the linear unsteady aerodynamics and consideration of an arbitrary timedependent external pressure pulse. Unsteady aeroelastic nonlinear kernels are determined, and based on these, frequency and time histories of the subcritical aeroelastic response are obtained, and in this context the influence of geometric nonlinearities is emphasized. Conclusions and results displaying the implications of the considered effects are supplied. NOMENCLATURE a Dimensionless elastic axis position measured from the midchord, positive aft c Chord length of 2D lifting surface, b 2 i hi i hi K K c c a a , , , Damping and stiffness coefficients in plunging and pitching (i=1,2,3  linear, quadratic, cubic), respectively a L C Liftcurve slope ( ) ( ) ( ) k G k F k C , , Theodorsen's function and its real and imaginary counterparts, respectively h , x Plunging displacement and its dimensionless counterpart, ( ) b h / , respectively n h , n H nth order Volterra kernel in time, and its Laplace transformed counterpart, respectively * Post Doctoral Associate. + Professor of Aeronautical and Mechanical Engineering, Department of Engineering Science and Mechanics. # Senior Research Scientist, Senior Aerospace Engineer, Aeroelasticity Branch, Structures Division, Senior Member AIAA. Copyright 2000 The American Institute of Aeronautics and Astronautics Inc. All right reserved. a I , a r Mass moment of inertia per unit wingspan and the dimension...
Numerical SteadyState Solutions of NonLinear DAE's Arising in RF Communication Circuit Design
"... 1 Introduction Large systems of coupled nonlinear ordinary differential equations (DAE) arise naturally in applications areas like in the design of radiofrequency integrated circuits. The steadystate response of a nonlinear system to periodic or quasiperiodic stimulus is of primary interest to ..."
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1 Introduction Large systems of coupled nonlinear ordinary differential equations (DAE) arise naturally in applications areas like in the design of radiofrequency integrated circuits. The steadystate response of a nonlinear system to periodic or quasiperiodic stimulus is of primary interest to a designer because certain aspects of system performance are easier to characterize and verify in steady state. For example: noise, distortion, blocking are best measured when a circuit is in this state. The system of equations generated in circuit design has the following form,
The Frequency Domain Behavioral Modeling and Simulation of Nonlinear Analog Circuits and Systems
, 1993
"... LUNSFORD II, PHILIP J. The Frequency Domain Behavioral Modeling and Simulation of Nonlinear Analog Circuits and Systems. (Under the direction of Michael B. Steer.) A new technique for the frequencydomain behavioral modeling and simulation of nonautonomous nonlinear analog subsystems is presented. ..."
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LUNSFORD II, PHILIP J. The Frequency Domain Behavioral Modeling and Simulation of Nonlinear Analog Circuits and Systems. (Under the direction of Michael B. Steer.) A new technique for the frequencydomain behavioral modeling and simulation of nonautonomous nonlinear analog subsystems is presented. This technique extracts values of the Volterra nonlinear transfer functions and stores these values in binary files. Using these files, the modeled substem can be simulated for an arbitrary periodic input expressed as a finite sum of sines and cosines. Furthermore, the extraction can be based on any circuit simulator that is capable of steady state simulation. Thus a large system can be divided into smaller subsystems, each of which is characterized by circuit level simulations or lab measurements. The total system can then be simulated using the subsystem characterization stored as tables in binary files.
TWO TECHNIQUES FOR MEASURING HIGHER ORDER SINUSOIDAL INPUT DESCRIBING FUNCTIONS.
"... For high precision motion systems, modeling and control design specifically oriented at friction effects is instrumental. The Sinusoidal Input Describing Function theory represents an approximative mathematical framework for analyzing nonlinear system behavior. This theory however limits the descr ..."
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For high precision motion systems, modeling and control design specifically oriented at friction effects is instrumental. The Sinusoidal Input Describing Function theory represents an approximative mathematical framework for analyzing nonlinear system behavior. This theory however limits the description of the nonlinear system behavior to a quasi linear amplitude dependent relation between sinusoidal excitation and sinusoidal response. In this paper an extension to Higher Order Describing Functions is realized by introducing the concept of the harmonics generator. The resulting Higher Order Sinusoidal Input Describing Functions (HOSIDFs) relate the magnitude and phase of the higher harmonics of the periodic response of the system to the magnitude and phase of a sinusoidal excitation. Based on this extension two techniques to measure HOSIDFs are presented. The first technique is FFT based. The second technique is based on IQ (inphase/quadraturephase) demodulation. In a simulation the measurement techniques have been tested by comparing the simulation results to analytically derived results from a known (backlash) nonlinearity. In a subsequent practical case study both techniques are used to measure the changes in dynamic behavior as function of drive level due to friction in an electric motor. Both methodes prove successful for measuring HOSIDFs. Key words Frequency domain analysis, nonlinear systems, har
Uniqueness of a Basic Nonlinear Structure
"... A/Asovzc~I ~ this paper we show that systems consisting of a memoryless nonlinearity sandwiched between two linear timeinvariant (LTI) operators are unique module scaling and delays. We mention a few corollaries and applications of general circuit and system theoretic interest. I I. ..."
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A/Asovzc~I ~ this paper we show that systems consisting of a memoryless nonlinearity sandwiched between two linear timeinvariant (LTI) operators are unique module scaling and delays. We mention a few corollaries and applications of general circuit and system theoretic interest. I I.
dynamic system to describe sprayer boom
"... excitation for the derivation of the best related linear ..."
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