Optimizing RF and Microwave Spectrum Analyzer Dynamic Range
Application Notes
What is dynamic range?
The dynamic range of a spectrum analyzer is traditionally defined as the ratio, in dB, of the largest to the smallest signals simultaneously present at the input of the spectrum analyzer that allows measurement of the smaller to a given degree of uncertainty. The signals of interest can either be harmonically or nonharmonically related.
Why is dynamic range important?
The dynamic range specification determines whether or not low-level signals will be visible in the presence of large signals and therefore is one of the most important performance figures for a spectrum analyzer. It is often misunderstood and misinterpreted, since the display range, measurement range, noise floor, phase noise, and spurious response of the instrument all play important roles in determining dynamic range. By understanding which dynamic range interpretation applies to a specific measurement, you can make more accurate, reliable, and repeatable spectrum analyzer measurements.