Question: Why Do We Need Oscillators In Transceiver Design?

What is Oscillation and its types?

An oscillator is a type of circuit that controls the repetitive discharge of a signal, and there are two main types of oscillator; a relaxation, or an harmonic oscillator.

This signal is often used in devices that require a measured, continual motion that can be used for some other purpose..

What is the advantage of Superheterodyning?

The advantages of superheterodyne receiver are many. An obvious advantage is that by reducing to lower frequency, lower frequency components can be used, and in general, cost is proportional to frequency. RF gain at 40 GHz is expensive, IF gain at 1 GHz is cheap as dirt.

How does a local oscillator work?

In electronics, a local oscillator (LO) is an electronic oscillator used with a mixer to change the frequency of a signal. This frequency conversion process, also called heterodyning, produces the sum and difference frequencies from the frequency of the local oscillator and frequency of the input signal.

What are the types of oscillators?

Types of Oscillators: Common oscillator technology variationsCrystal Oscillators.SAW oscillators.MEMS Oscillators.Voltage-controlled oscillators.Voltage-controlled oscillators can operate at higher frequencies but are much less stable than other oscillator signals.

What is meant by Heterodyning?

Using an electronic circuit to combine an input radio frequency with one that is generated in order to produce new frequencies: one that is the sum of the two and another that is the difference of the two. Heterodyning is typically used to bandshift incoming frequencies into intermediate frequencies for demodulation.

How does a transceiver work?

Transceivers are wavelength-specific lasers that convert electrical data signals from data switches into optical signals. These signals can then be transmitted over the optical fiber. Each data stream is converted to a signal with a unique wavelength, meaning that it is effectively a unique light color.

What is transceiver circuit?

A Transceiver can be used to provide bidirectional, input or output control, of either digital or analogue devices to a common shared data bus. Unlike the buffer, transceivers are bidirectional devices which allow data to flow through them in either direction.

What is the use of IF amplifier?

Intermediate-frequency (IF) amplifiers are amplifier stages used to raise signal levels in radio and television receivers, at frequencies intermediate to the higher radio-frequency (RF) signal from the antenna and the lower (baseband) audio or video frequency that the receiver is recovering.

What is the basic principle of oscillator?

There are many types of electronic oscillators, but they all operate according to the same basic principle: an oscillator always employs a sensitive amplifier whose output is fed back to the input in phase. Thus, the signal regenerates and sustains itself. This is known as positive feedback.

Why local oscillator frequency is higher?

As a listener tunes across the broadcast band, the local oscillator is also tuned in synchronism so as to precisely produce a single-frequency signal (essentially an unmodulated carrier signal) which is higher in frequency by 455 kHz in comparison to the incoming signal.

What is the frequency of local oscillator?

The local oscillator will be operating at a frequency of 1090 MHz. The received and local oscillator signals are mixed, or heterodyned, in the converter stage and one of the frequencies resulting from this mixing action is the difference between the two signals, or 60 MHz, the IF frequency.

What is the purpose of a transceiver?

In radio communication, a transceiver is a device that is able to both transmit and receive information through a transmission medium. It is a combination of a transmitter and a receiver, hence the name transceiver.

What are the functions of oscillator in receiver circuit?

An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave. Oscillators convert direct current (DC) from a power supply to an alternating current (AC) signal.

What is the function of the mixer and local oscillator in radio receiver?

For the receiver, the signal from the antenna is amplified in the radio frequency (RF) stage. The output of the RF stage is one input of a mixer. A Local Oscillator (LO) is the other input. The output of the mixer is at the Intermediate Frequency (IF).

What is the purpose of local oscillator?

Local oscillators are used to convert an incoming frequency to another frequency and sometimes are used to convert from one internal frequency to another.