A Symmetric Triangle-Square Waveform Generator Using a Single Constant Current Source

A symmetric and accurate triangular waveform generating circuit is described. A simple approach in maintaining the symmetry and linearity of triangular waveform is made by using a single constant current generator to alternately charge and discharge a capacitor in a linear manner. This features perfect symmetry of the waveform over a wide frequency range while maintaining amplitude constancy. The circuit also provides square waveforms of equal on and off periods with rise and fall times of the order of a few nanoseconds. Continuous variation of frequency of the waveform generated is possible by changing a single parameter and it is feasible to have linear, exponential, or logarithmic modulation of frequency. It can be used as a triangle-square waveform generator and as a triangle-to-sine converter with the addition of a few components.