Dual-Channel Precision Signal-to-Noise Ratio Generator

During the development and testing of signal processing systems, it is useful to generate test signals in the laboratory in order to quantify system parameters such as dynamic range, processing gain, or frequency resolution. Furthermore, it is convenient to have two test signals that are calibrated and easily variable over a range of signal-to-noise ratios (S/Ns), with the noise in each test signal uncorrelated from the other. To satisfy these and other requirements, the Dynamic Range Tester (DRT) is designed as an inexpensive test instrument and constructed using off-the-shelf components. The DRT is used for a wide range of testing and demonstration purposes.