> 1 | Introduction

> Efficient power supply design is a key issue for any wireless application - be it GSM, GPRS or UMTS. The purpose of this application note is to support system integrators in developing an application layout that minimizes current consumption, reduces the effects of voltage drops and ripples and ensures a reliable product performance.
> This document covers the entire range of Siemens wireless modules. All examples have been chosen to be generally applicable to most product types. Yet, the diversity of the products implies that, due to hardware or software specific properties, functional differences occur regarding the implementation of features, AT commands and parameters. Therefore, please consult the documents supplied with your module, especially [1] and [2], to make sure whether or not a described feature is supported.