Accurately Applying Wideband Modulated Signals to a DUT Using an Extended VSG-VSA Setup

Starting from a classical Vector Signal Generator - Vector Signal Analyzer (VSG - VSA) configuration, this paper explains how to extend the setup using proper hardware and software to enforce a desired wideband periodic modulated input signal at the Device Under Test (DUT). Using a relatively simple and straightforward algorithm, this paper shows that it is possible to compensate for both linear and nonlinear distortions as part of the generation and as part of the (non)linear interaction at the input of the DUT. This approach does not rely on compact test signals in order to apply spectral digital predistortion (DPD) to the parent signal. Instead, the correction can be extracted and applied on-the-fly and in-situ using a 3GPP-comnliant signal while the DUT is connected.