Which type of oscillators generate complex waveforms like square or sawtooth waves?

Nonsinusoidal oscillators are designed specifically to generate complex waveforms, such as square or sawtooth waves. Unlike sinusoidal oscillators, which produce only pure sinusoidal waveforms, nonsinusoidal oscillators can create various shapes that are essential in different applications, including digital signal processing and waveform generation in instrumentation.

These oscillators leverage different principles to achieve the desired waveform shapes, often utilizing feedback mechanisms, switching elements, or integrators and differentiators in their designs. This capability allows them to be employed in scenarios where precise timing and control of signal shapes are critical, such as in clock circuits, function generators, and synthesizers.

The other options, such as linear and sinusoidal oscillators, typically focus on generating waveforms that are smooth and continuous, like sine waves, which do not fulfill the requirement for complex waveforms. Stabilized oscillators primarily focus on maintaining a precise frequency output rather than the variety of waveform shapes. Thus, nonsinusoidal oscillators are uniquely suited for applications requiring complex waveforms.