Frequency planning is a paramount part of any frequency-based application. Making sure that the frequency or frequencies of interest are valid, within band, and not reduced to the point where you lose the spurious dynamic range should be part of any frequency development strategy. In this paper, we will cover high-speed analog-to-digital converter (ADC) Nyquist rules as they apply to super Nyquist sampling. We will also cover how to use decimation to aid in your frequency planning and how to guard band against falling into a frequency “hole” during the design and development stage.