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Optimizing dominant time constant in RC circuits

Optimizing dominant time constant in RC circuits,10.1109/43.681261,IEEE Transactions on Computer-aided Design of Integrated Circuits and Systems,Lieve

Optimizing dominant time constant in RC circuits   (Citations: 19)
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Abstract— Conventional methods for optimal sizing of wires and transistors use linear resistor-capacitor (RC) circuit models and the Elmore delay as a measure of signal delay. If the RC circuit has a tree topology, the sizing problem reduces to a convex optimization problem that can be solved using geometric pro- gramming. The tree topology restriction precludes the use of these methods in several sizing problems of significant importance to high-performance deep submicron design, including for example, circuits with loops of resistors, e.g., clock distribution meshes and circuits with coupling capacitors, e.g., buses with crosstalk between the wires. In this paper, we propose a new optimization method that can be used to address these problems. The method,is based on the dominant,time constant as a measure of signal propagation delay in an RC circuit instead of Elmore delay. Using this measure, sizing of any RC circuit can be cast as a convex optimization problem and solved using re- cently developed efficient interior-point methods for semidefinite programming. The method,is applied to three important sizing problems: clock mesh sizing and topology design, sizing of tristate buses, and sizing of bus line widths and spacings taking crosstalk into account. Index Terms— Circuit optimization, circuit topology, clocks,
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    • ...The study in [7] is one of the earliest works connecting the convex optimization theory to circuit design, whose objective is to optimize the dominant time constant of a linear resistor–capacitor circuit using semidefinite programming...
    • ...The study in [7] studies a linear resistor–capacitor circuit described by the differential equation...
    • ...It is shown in [7] that the problem of finding the parameter vector in such a way that the dominant time constant of the circuit (2) is optimized can be cast as a semidefinite programming problem...
    • ...The present work deals with another type of circuit problem, which is more complicated than the one tackled in [7]...

    Javad Lavaeiet al. Solving Large-Scale Hybrid Circuit-Antenna Problems

    • ...Other uses of ℓ1 based methods include total variation denoising in image processing [ROF92, BC98], circuit design [VBG97, VBG98], sparse portfolio optimization [LFB07], and trend filtering [KKBG09]...

    Argyrios Zymniset al. Compressed Sensing With Quantized Measurements

    • ...Some examples of ℓ1 type methods for sparse design in engineering include Vandenberghe et al. [11,12] for designing sparse interconnect wiring, and Hassibi et al. [13] for designing sparse control system feedback gains...

    Emmanuel J. Candèset al. Enhancing Sparsity by Reweighted ℓ 1 Minimization

    • ...Thermal capacitors in this circuit are all connected to the ground, which corresponds to the motor ambient, and each node in the grounded capacitor RC circuit is connected to one capacitor [22]...
    • ...The symmetric matrix Λt is positive definite when passivity and reciprocity are assumed [22]...
    • ...where the thermal time constant τj is real and positive and αj is the magnitude associated with τj [22]–[24]...

    Zhi Gaoet al. A Model Reduction Perspective on Thermal Models for Induction Machine ...

    • ...Because the poles are given by the reciprocals of the eigenvalues of the matrix [12], bounding the poles of a system can be formulated as a generalized eigenvalue minimization problem (GEVP) as follows [14]:...
    • ...To guarantee the eigenvalues of the matrix to be non-negative, needs to be larger than all the eigenvalues of matrix , i.e., the reciprocals of the poles, or all the possible time constants in the interconnect system [14]...

    Bao Liuet al. Minimum Decoupling Capacitor Insertion in VLSI Power/Ground Supply Net...

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