what is oscillator?

Answer 1

oscillator, electronic



(ŏs´lā´´tr) , electronic circuit that produces an output signal of a specific frequency. An oscillator generally consists of an amplifier having part of its output returned to the input by means of a feedback loop; the necessary and sufficient condition for oscillation is that the signal, in passing from input to output and back to input via the feedback loop, arrive at the input with no change in amplitude or phase. If this condition is met for only a single frequency, the output is a pure sine wave; if it is met for more than one frequency, the output is a complex wave. Some oscillators are designed to operate under certain conditions so that the output is a square wave, a triangular wave, or a pulse. In some cases, a very stable mechanical oscillator, such as a specially prepared quartz crystal, may be coupled to an electronic oscillator to enhance its frequency stability. The frequency of a voltage-controlled oscillator, used in frequency modulation, is automatically adjusted by a small control current.

Answer 2

An oscillator is the basic element of all ac signal sources. It generates a sinusoidal signal of known frequency and amplitude. An oscillator is one of the most basic and useful instruments used in electrical and electronic measurements.

Since sinusoidal waveforms are encountered so frequently in electronic measurement work, the oscillator (sine wave generator) represents the largest single category of signal generators. This device covers the frequency range from a few Hz to many GHz.

Although an oscillator is known as a sinusoidal signal “generating” device, it is to be noted that it does not create energy, but merely acts as an energy converter. All it does is convert the unidirectional current drawn from a dc source of supply into an alternating current of desired frequency. The idea is the reverse process of what happens in a rectifier and, therefore, can also be called as an inverter. However, we generally think of oscillator circuits as providing an ac voltage signal.

Applications
An oscillator is mostly used in electronic communication equipments.
“Local” oscillators are used to assist the reduction of the incoming radio frequency (RF) to a lower intermediate frequency in different modulations like AM (amplitude modulation) and FM (frequency modulation) super heterodyne receivers.
Oscillator circuits are also used to generate the RF carrier in the “exciter” section of a transmitter.
They are also used as “clocks” in digital systems such as microcomputers, in the sweep circuits found in TV sets and oscilloscopes.

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Answer 3

An oscillator is a mechanical or electroni device that works on the principle of periodic fluctuation between 2 things based on changes in energy.
In electronics it could send out an electromagnetic signal of a given frequency.
A clock pendulum is a simple oscillator. They are used in computers,clocks, metal detectors and wireless transmitters and receivers.

Answer 4

a particular crystal`s output frequency(s) may be tuned over a narrow variety of frequencies by way of various the Voltage utilized around the crystal.. changing the ambient temperature might additionally reason a metamorphosis interior the crystal`s output frequency over a constrained variety of frequencies. Tuned circuits may be utilized on the side of a crystal to narrow the band of frequencies latest on the oscillator`s output.