Definition

The oscillator is simply a frequency source and is typically used in phase-locked loops.

Oscillator

In detail, it is a device that can convert DC power into AC power without external signal excitation.

Generally divided into positive feedback and negative resistance.

The so-called “oscillation” implies the communication, and the oscillator contains a process and function that never oscillates to oscillate.

Such a device can be converted from DC power to AC power, and such a device can be called an “oscillator.”

Introduction

An oscillator is an electronic component used to generate repeated electronic signals (usually sine or square waves).

The circuit that constitutes it is called an oscillating circuit.

An electronic circuit or device capable of converting direct current into an output having a certain frequency of alternating current signals.

There are many types, which can be divided into:

  • Self-excited oscillator
  • Separate excited oscillator

According to the circuit structure can be divided into:

  • Resistor-capacitor oscillator
  • Inductance capacitor oscillator
  • Crystal oscillator
  • Tuning fork oscillator

According to the output waveform, it can be divided into:

Oscillator such as sine wave, square wave, and sawtooth wave.

Widely used in electronics industry, medical, scientific research and other aspects.

A low-frequency oscillator (LFO) is an oscillator that generates an AC signal with a frequency between 0.1 Hz and 10 Hz.

This term is often used in audio synthesis to distinguish other audio oscillators.

The oscillators can be divided into two main types:

  • Harmonic oscillator
  • Relaxation oscillator

It is mainly applied to the shaking culture of various liquid and solid compounds such as biology, biochemistry, cells and bacteria in scientific research departments such as universities, medical, petrochemical, health and epidemic prevention, and environmental monitoring.

Self-excited multivibrators are also called unsteady circuits.

The collectors of the two tubes each have a capacitor connected to the base of the other tube, which acts as an AC coupling to form a positive feedback circuit.

When the power is turned on, one tube is turned on first and the other tube is turned off.

At this time, the collector of the conducting tube has an output, and the capacitance of the collector couples the pulse signal to the base of the other tube to turn the other tube on.

At this time, the originally turned-off tube is cut off. Thus, the two tubes are turned on and off in turn, and an oscillating current is generated.

Since the parameters of the device are not exactly the same, the state of the two transistors changes at the moment of power-on.

This change is due to the increasing effect of positive feedback, leading to a transient steady state.

During the transient steady state, the other transistor is turned on or off after being gradually charged by the capacitor, and the state is turned over to reach another transient state.

This cycle begins to oscillate.

Sine wave oscillator

An oscillator capable of outputting a sine wave is called a sine wave oscillator.

Sine wave oscillators mainly include LC oscillator RC oscillators.

The most basic part of the oscillator

  1. Triode amplifier

The main function is to control the energy.

  1. Positive feedback network

Feedback part of the output signal to the input.

  1. Frequency selection network

It is used to select the required oscillation frequency so that the oscillator can oscillate at a single frequency to obtain the desired waveform.