Differential Passive Circuit Modelling with Pentapole Impedance Matrices Application to an Integrated Audio Switching Amplifier for Portable Devices

Roberto Mrad (1, 2) , Florent Morel (1) , Gaël Pillonnet (3) , Christian Vollaire (1) , Denis Labrousse (1)

1 AMPERE - Ampère
2 INL - Institut des Nanotechnologies de Lyon
3 INL - CSH - INL - Conception de Systèmes Hétérogènes

In this paper a novel method to model the passive parts of differential output system is presented. This approach, based on impedance matrices, models conducted EMI and takes into account component non-idealities. It is not only able to deal with common mode but also differential mode and with conversion between the two modes. This method is experimentally applied to the passive output part of an audio differential switching amplifier dedicated to mobile phone applications. Using a simple impedance-meter, results show good accuracy up to 110 MHz when associating the different parts of the system.

Keywords: impedance matrices; frequency domain modeling; passive circuit modeling; conducted EMI

Domains: Engineering Sciences [physics]

Roberto Mrad, Florent Morel, Gaël Pillonnet, Christian Vollaire, Denis Labrousse. Differential Passive Circuit Modelling with Pentapole Impedance Matrices Application to an Integrated Audio Switching Amplifier for Portable Devices. EMC, 2011, York, United Kingdom. ⟨hal-01103635⟩