group_delayApplied Radio Labs www.radiolab.com.au Group Delay Explanations and Applications Design File: DN004 15 November 1999 Introduction Group delay is a concept that radio engineers are encountering more frequently as higher performance digital communication systems are developed. It appears that frequency selective components have group delay which, in most cases, seems to degrade system performance. This article addresses several aspects of this topic: 1. Must we have group delay? 2. The relationship between group delay and signal delay. 3. Negative group delay 4. The relationship between group delay and filter loss in passive filters that the group delay is in some way related to signal delay. The group delay may also be referred to as “envelope delay”. The Delay of Signals Given a filter……