Cyclostationarity: half a century of research

Advances in global linear instability analysis of nonparallel and three-dimensional flows

This paper describes the latest and most advanced surface-potential-based model jointly developed by The Pennsylvania State University and Philips. Specific topics include model structure, mobility and velocity saturation description, further development and verification of symmetric linearization method, recent advances in the computational techniques for the surface potential, modeling of gate tunneling current, inclusion of the retrograde impurity profile, and noise sources. The emphasis of this paper is on incorporating the recent advances in MOS device physics and modeling within the compact modeling context

PSP: An Advanced Surface-Potential-Based MOSFET Model for Circuit Simulation

In this paper, we propose a new harmonic balance simulation methodology based on a linear-centric modeling approach. A linear circuit representation of the nonlinear devices and associated parasitics is used along with corresponding time and frequency domain inputs to solve for the nonlinear steady-state response via successive chord (SC) iterations. For our circuit examples, this approach is shown to be up to 60/spl times/ more run-time efficient than traditional Newton-Raphson (N-R) based iterative methods, while providing the same level of accuracy. This SC-based approach converges as reliably as the N-R approaches, including for circuit problems which cause alternative relaxation-based harmonic balance approaches to fail. The efficacy of this linear-centric methodology further improves with increasing model complexity, the inclusion of interconnect parasitics and other analyses that are otherwise difficult with traditional nonlinear models.

/pdf/a-linear-centric-modeling-approach-to-harmonic-balance-1hgxpfo186.pdf

A Linear-Centric Modeling Approach to Harmonic Balance Analysis

https://www.dtc.umn.edu/s/resources/bib05eurasip.pdf

Bibliography on cyclostationarity

A new adaptive approach to solving large-dimension harmonic balance (HB) problems in RF circuit simulation is presented. The method is based on adjusting the order of the equation system according to the degree of nonlinearity of each node in the circuit. A block-diagonal preconditioner is used to construct an algorithm for order reduction during the iterative HB process.

/pdf/new-methods-for-speeding-up-computation-of-newton-updates-in-jh9iby8045.pdf

New methods for speeding up computation of Newton updates in harmonic balance

A new computational concept of timing jitter is proposed that is suitable for exploitation in circuit simulators. It is based on the approximation of computed noise characteristics. To define jitter value the parameter representation is used. The desired parameters are obtained after noise simulation process in time domain by minimization of integral residual L/sub 2/-norm. The approach is illustrated by examples of jitter computation using spice-like simulator.

/pdf/approximation-approach-for-timing-jitter-characterization-in-2u7y36g4hn.pdf

Approximation Approach for Timing Jitter Characterization in Circuit Simulators

Krylov subspace techniques in harmonic balance simulations become increasingly ineffective when applied to strongly nonlinear circuits This limitation is particularly important in the simulation if the circuit has components being operated in a very nonlinear region Even if the circuit contains only a few very nonlinear components, Krylov methods using standard preconditioners can become ineffective To overcome this problem, we present two adaptive preconditioners that dynamically exploit the properties of the harmonic balance Jacobian With these techniques we have been able to retain the advantages of Krylov methods even for strongly nonlinear circuits Some numerical experiments illustrating the techniques are presented

The enhancing of efficiency of the harmonic balance analysis by adaptation of preconditioner to circuit nonlinearity

A new approach and technique for periodic distortion analysis is proposed. It is computationally efficient in comparison with complete nonlinear steady-state analysis. In contrast with the Volterra series approach this technique does not require high order derivatives of the device models. The numerical scheme of periodic distortion analysis is described. The technique is illustrated by examples of periodic distortion computation in nonlinear circuits using Spice-like simulator.

New computational technique for periodic distortion analysis of communication circuits

A technique to accelerate harmonic balance (HB) analysis by taking into account frequency domain latency is presented. The algorithm automatically determines the individual number of harmonics for different nodes. The algorithm is based on Krylov subspace iterative techniques and provides selective estimation of residual norm under reducing dimension.

K.K. Gullapalli

Papers

New methods for speeding up computation of Newton updates in harmonic balance

Approximation Approach for Timing Jitter Characterization in Circuit Simulators

The enhancing of efficiency of the harmonic balance analysis by adaptation of preconditioner to circuit nonlinearity

New computational technique for periodic distortion analysis of communication circuits

A new technique to exploit frequency domain latency in harmonic balance simulators