Analytical determination of the waveforms of nonlinear oscillators
Hai Siong Tan, K.W.H. Foulds · IEE Journal on Electronic Circuits and Systems · 1977
A set of equations has been derived which describes the steady-state oscillations of any nonlinear device with a loopless current/voltage characteristic in any frequency-dependent circuit. The equations are expressed in terms of the amplitudes of the waveform harmonic components, the admittances or impedances at the harmonic frequencies, and the time-averaged integrals of the derivatives of the oscillation voltage and current.