Anestis Dounavis

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In this paper, a closed-form matrix rationalapproximation algorithm is proposed to efficiently model the delay and crosstalk noise of coupled RLC on-chip interconnects. A key feature of the proposed algorithm is that, for any rational order, the approximation is obtained analytically in terms of predetermined coefficients and the per-unit-length parameters.(More)
In this paper, a waveform relaxation algorithm is presented for efficient transient analysis of large transmission-line networks. The proposed methodology represents lossy transmission lines as a cascade of lumped circuit elements alternating with lossless line segments, where the lossless line segments are modeled using the method of characteristics.(More)
This paper presents an efficient methodology to improve the convergence properties of vector fitting (VF) when the frequency data is contaminated by noise. The proposed algorithm uses an instrumental variable approach, which minimizes the biasing effect of the least squares solution caused by the noise of the data samples. These instruments are generated(More)
We present the discrete prototype version of our design of a wireless telemetry system architecture, which is suitable for custom IC implementation and intended to eventually retrieve blood pressure and volume (PV) data from small animal subjects (e.g., mice, rats). The architecture consists of four system level blocks that are stacked in 2.475cm volume and(More)
In this paper a waveform relaxation algorithm based on longitudinal partitioning is presented to efficiently model large distributed networks. The proposed methodology represents lossy transmission lines as a cascade of lumped circuit elements and lossless line segments, where the lossless line segments are modeled using the method of characteristics. This(More)
Signal integrity analysis has become imperative for high-speed designs. In this paper, we present a new technique to advance Krylov-space based passive model-reduction algorithms to include lossy coupled transmission lines described by Telegrapher's equations. In the proposed scheme, transmission line subnetworks are treated with closed-form stamps obtained(More)
We present a power transfer sensitivity analysis of a four-coil resonance-based wireless power delivery system that is used to provide energy to a small-size biotelemetry system implanted into non-human freely moving subjects. Both axial and angular misalignments have been evaluated, with calculations for the worst-case misalignment of 15mm axial distance(More)
An efficient approach is presented for time-domain sensitivity analysis of lossy multiconductor transmission lines with respect to electrical and/or physical parameters. The proposed method employs delay extraction prior to approximating the matrix exponential stamp of the line and guarantees macromodel passivity. A delay-extraction-based equivalent circuit(More)
This paper presents a delay and crosstalk noise model for coupled resistance-inductance-capacitance (RLC) on-chip interconnects. The proposed algorithm, based on a modified Lie formula, is used to convert the solution of the transmission line network into delay algebraic equations to obtain the time domain response. The proposed algorithm is not limited to(More)