The image frequency in Rf/wireless receivers is an issue that has to be understood by radio designers and tackled for robust design. The image frequency is a so-called spurious signal which can cause a number of bad effects.Its origin lies in the mixing of multiple frequency signals in the receiver mixer. A paper released recently by Signal Processing Group Inc., describes this effect in simple terms so that an understanding of the effect may be obtained by interested designers. The paper can be accessed in the engineer’s corner at http://www.signalpro.biz.