What Should Proper High-Speed Converter Passband Flatness Look Like? (Part 1) (Download)
With analog input or output bandwidth in high demand, understanding converter bandwidth—also known as a passband flatness measurement—is paramount. Passband flatness measurements can sometimes be tricky or misleading. Whether you’re sampling in the megasample- or gigasample-per-second ranges, the same principles apply in uncovering the necessary bandwidth of the converter, the analog input/output network connecting to the converter, or both.
In this two-part series, we will cover the fundamental frequency-response measurement method as it applies to both analog-to-digital converters (ADCs) and digital-to-analog converters (DACs), with or without internal digital downconverter (DDC) or digital upconverter (DUC) functions. This method will enable you to measure and characterize the analog bandwidth for the converter in your next receiver design.