Signal Generation Based on Low Cost Virtual Instrumentation

Abstract

The digital programmable signal generator (DPSG) is a system capable of generating the classical signals, like sinusoidal, quadratic, triangular and sawtooth, as well as any other arbitrary analog signal defined by the user through the waveform editor using different alternatives like using a graphical editor, a text editor, a mathematical equations editor and an armonics editor. To generate the signal, the direct digital synthesis method is used (DDS). The system is composed of the software module developed in the LabView 7.1 framework, which corresponds to the virtual instrument associated with the wave shape editor and the board holding the non-volatile RAM in which the samples of the signal to be generated are stored, signals previously digitalized in the editor, the muC and the CPLD that control the system operability, and the digital to analog converter DAC which outputs the 8 bits resolution analog signal