Question

__________ have frequency band range 20 kHz - 30 MHz.
1. Video frequency oscillators
2. High frequency oscillators
3. Radio frequency oscillators
4. Very high frequency oscillators

Answer 1

Correct Answer - Option 3 : Radio frequency oscillators

Oscillator: An oscillator is an electronic circuit or device which can convert a steady-state signal into an oscillating signal. For example, the oscillator can convert a steady-state DC signal into a periodic  AC signal of the desired frequency.

Types of Oscillator:

(1) We already know that the oscillator circuit has a feedback path so according to the feedback path,

1. Positive Feedback Oscillator
2. Negative Feedback Oscillator

(2) We know that the Oscillator circuit creates an oscillating signal which may be many types in Waveform. So based on the types of the waveform the Oscillator classified as below,

1. Sine Wave Oscillator
2. Rectangular or square wave Oscillator
3. Sawtooth Wave oscillator

A special type of single Oscillator can also create all types of Waveforms.

(3) Based on the circuit design,

1. LC Oscillator
2. RC Oscillator
3. Crystal Oscillator

(4) According to the frequency range,

1. Low-Frequency Oscillator
2. High-Frequency Oscillator
3. Very High-Frequency Oscillator
4. Ultra High-Frequency Oscillator

Examples of Oscillator:
Some examples of oscillators are Royer Oscillator, Tri-tet Oscillator, Armstrong Oscillator, Meissner Oscillator, Pierce Oscillator, Ring Oscillator etc.

Applications of Oscillator:
There are huge applications of oscillators which are given below,

1. The oscillator is used in Watches.
2. Oscillators are used in Radio Circuits.
3. Oscillators are used in smartphones, computer laptops etc.
4. Royer Oscillators are used in some DC to AC Inverter circuits.
5. Armstrong Oscillator is used to very high-frequency sinusoidal signals.
6. Pierce Oscillators are mainly used in crystal oscillator circuits.
7. Oscillators are used in stun guns.
8. Oscillators are used in ultrasonic machines.
9. In metal detectors oscillators are also used.

  

Oscillator	Frequency Range
Low-Frequency Oscillator	20Hz - 100kHz
High-Frequency Oscillator	300KHz - 20MHz
Very High-Frequency Oscillator	30MHz - 300 MHz
Ultra High-Frequency Oscillator	300MHz - 3000 MHz.
Radio Frequency Oscillator	100 kHz to 100 GHz