Practical Waveforms Based on Harmonic Oscillations

A bisinusoidal ° Fit) is a sinusoidal plus its second overtone phase-shifted by 90°  

FIGURE 3.7 Bisinusoidal waveforms by Equation 3.26 with /=0.5 (dash-dot line), 1 (solid), 2 (long dash), 3 (medium dash), 4 (short dash), and 6 (dotted). 

Here/opt = 2 is coincidentally the same as for rectangular F t), and the maximum is even more gentle here (F3) is below by just 5% at f= 3 and 14% at 

Unlike rectangular Fit), bisinusoidal F t) can be generated virtually exactly. However, circuits with nonlinear capacitance approximate Equation 3.26 by a waveform with the form-factor (for n= 1) lower by l/4, or l/3 versus the rectangular F t). Such forms were not adopted broadly, perhaps because of low form-factor, and will not be further discussed. 

Another profile that is implemented relatively easily and accurately is a clipped- or half-sinusoidal. This is a vertically shifted harmonic with a fixed cutoff  

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