Oscillator Circuits
Dale R. Patrick, Stephen W. Fardo, Ray E. Richardson, Vigyan Chandra · River Publishers eBooks · 2023
Many electronic systems employ circuits that convert the DC energy of a power supply into a useful form of AC. There are several possible ways of describing an oscillator. In this chapter, it is convenient to divide oscillators according to their method of operation. The two basic types of oscillators based on their method of operation are the feedback oscillator and the relaxation oscillator. The oscillations of a tank circuit could be made continuous if energy were periodically added to the circuit. The operation of a relaxation oscillator usually depends on the charge and discharge of an RC or an RL network. The Wien-Bridge oscillator is used for generating low frequencies. Typically, this oscillator uses an RC bridge network to accomplish regenerative feedback when connected to an op-amp. The charge and discharge of a capacitor through a resistor can be used to generate a sawtooth waveform. Oscillators are usually composed of a combination of passive and active components.