Techniques for determining the spectral content of a data bus are described herein. An example of a device in accordance with the present techniques includes a data bus comprising one or more signal lines, a first phasor generator, and a second phasor generator. The first phasor generator obtains a first data value based on the data to be transmitted over the data bus and generates a first phasor. The second phasor generator obtains a second data value based on the data to be transmitted over the data bus and generates a second phasor. The sum of the first phasor and the second phasor indicate, at least in part, the spectral content of the data to be transmitted over the data bus.