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Optimal Frequency Sweep Method in Multi-rate Circuit Simulation by Bittner, Kai; Brachtendorf, Hans Georg is a scholarly article available to read on EtoBox.

What is Optimal Frequency Sweep Method in Multi-rate Circuit Simulation about?

Purpose -- RF circuits often possess a multi-rate behavior. Slow changing baseband signals and fast oscillating carrier signals often occur in the same circuit. Frequency modulated signals pose a particular challenge. Design/methodology/approach -- The ordinary circuit differential equations (ODEs) are first rewritten by a system of (multi-rate) partial differential equations (MPDEs) in order to decouple the different time scales. For an efficient simulation we need an optimal choice of a frequency dependent parameter. This is achieved by an additional smoothness condition. Finding -- By incorporating the smoothness condition into the discretization, we obtain a nonlinear system of equations complemented by a minimization constraint. This problem is solved by a modified Newton method, which needs only little extra computational effort. The method is tested on a Phase Locked Loop with a frequency modulated input signal. Originality/value -- A new optimal frequency sweep method was introduced, which will permit a very efficient simulation of multi-rate circuits.

Author

Bittner, Kai; Brachtendorf, Hans Georg

Published

2016

Language

EN