| Harmonic oscillators generate sinusoidal waveforms. The amplitude and frequency of the generated waveform must be independent of the initial conditions of the system. Therefore, amplitude stability in the oscillators is one of the main concerns in generating accurate sinusoidal waveforms. Traditionally, this is achieved using methods like automatic gain control. The extra non-linearity imposed to the system due to applying this method can create phase noise in the waveform generated by the oscillator. Moreover, the complexity of implementing such a controller can be a problem. In this paper, sliding mode control is introduced as an alternative method in developing a robust harmonic oscillator. It is shown that by using the proposed method, the amplitude can be stabilized at the desired value without depending on the initial conditions, while the controller as well as the design procedure has relatively less complexity. |
