- Published in issue 7/1999 on page 27
Three-phase sine wave generator
The diagram shows how a three-phase sine wave oscillator can be built with a single Type UAF42 state-variable filter and some resistors and diodes. Three output nodes are available: high-pass out, band-pass out, and low-pass out. The signal at the band-pass and low-pass out nodes is 90° and 180° out of phase, respectively, with that at the high-pass node. An on-chip auxiliary op amp is available for use as a buffer or amplifier stage.