A LabVIEW implementation of digital waveform quadrature oscilator by virtual instrumentation

Paper deals with digital generating quadrature wave, their measurement and monitoring using Lab View virtual instrumentation system. Beside classical triangular digital quadrature oscillator there are investigated rectangular- and meander-type waveforms and also three-phase Clarke transformed orthogonal waveforms. There is shown — using digital computation of total harmonic distortion — that meander-type quadrature waves reache minimum THD equal 5 %. The block scheme of virtual implementation of those system using LabView is given.