Digital correction for improved spectral response in signal generation systems

Abstract

A bstract-Signal generation systems using Direct Digital Synthesis (DDS) techniques have received a great deal of attention recently due to their flexibility, repeatability, and wide range of stable operating frequencies. The spectral accuracy of these systems is limited by the analog components used to convert the signal into continuous-time. This work will demonstrate how the addition of digital signal processing and a feedback loop around the analog signal path can increase the spectral quality.

Digital correction of dynamic nonlinearities in digital-to-analog converters

“…1 shows the block diagram of an algorithm which will iteratively search for such an input (under certain conditions discussed below)[61]. A Fast Fourier Transform (FFT) is performed on the digital signal to determine the ideal spectrum.The Discrete Fourier Transform could be used for more generality, but the efficiency of the P FT makes it a better choice.…”