summary of Oscillators

summary

An oscillator is a nonrotating device for producing alternating current.

● The output of an oscillator can be sinusoidal, rectangular, or sawtooth.

● The main requirement of an oscillator is that the output be uniform and not vary in frequency or amplitude.

● A tank circuit is formed when a capacitor is con- nected in parallel with an inductor.

● A tank circuit oscillates when an external voltage source is applied.

● The oscillations of a tank circuit are dampened by the resistance of the circuit.

● For a tank circuit to maintain oscillation, positive feedback is required.

An oscillator has three basic parts: a frequency- determining device, an amplifier, and a feedback circuit.

● The three basic types of sinusoidal oscillators are LC oscillators, crystal oscillators, and RC oscillators.

● The three basic types of LC oscillators are the Hartley, the Colpitts, and the Clapp.

● Crystal oscillators provide more stability than LC oscillators.

● RC oscillators use resistance-capacitance networks to determine the oscillator frequency.

● Nonsinusoidal oscillators do not produce a sine-wave output.

● Nonsinusoidal oscillator outputs include square, sawtooth, rectangular, and triangular waveforms and combinations of two waveforms.

● A relaxation oscillator is the basis of all nonsinusoidal oscillators.

● A relaxation oscillator stores energy in a reactive component during one part of the oscillation cycle.

● Examples of relaxation oscillators are blocking oscillators and multivibrators.

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