The well known equation found behind all mixer-spurious analysis programs is given by (after the paper by Bert Henderson)
in which n and m are (positive and negative) integers. Even though this equation is quite simple, its ramifications in RF design are significant. This same equation can be applied to A/D converters and D/A converters, but this usage will not be discussed here at this time.
There are many mixer spur analysis programs on the internet along with a host of other retail packages – so why yet another program?
The analysis program described here is tailored more closely to the different perspectives involved with receiver versus transmitter related design. The receiver design mode is choreographed using the main screen to the left and provides two types of output results. The first output type is the traditional spurious plot shown below where a specific receive (and consequently specific LO) frequency is used. The receive frequency of interest is easily changed using the “Adjust LO Frequency” slider in the main screen. Provisions to facilitate easy labeling of each spurious track are provided as shown.