What is the role of the local oscillator in the block diagram?
Table of Contents
Schematic Diagram and Circuit Descriptions Page. Introduction: The local oscillator is the heart of the receiver. It is the most critical circuit in the entire receiver because any drift or instability in the local oscillator will translate into drift and instability in the received signal.
What is local oscillator of a radar receiver?
The local oscillator excite a frequency for mixing with the incoming signal to get the intermediate frequency. Most radar receivers use megahertz intermediate frequency (IF) with a value between 30 and 75 megahertz. The IF is produced by mixing a local oscillator signal with the incoming signal.
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 main function of a local oscillator in case of superheterodyne receiver?
A local oscillator provides the mixing frequency; it is usually a variable frequency oscillator which is used to tune the receiver to different stations.
Why local oscillator is used in AM?
In an AM or FM receiver, a Local Oscillator (LO) is used to mix its frequency with the frequency of the station being received (tuned to or listened to).
What does the local oscillator do?
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 is local oscillator signal?
What is the meaning of local oscillator?
In a superheterodyne radio, a local oscillator is an electronic circuit that generates a frequency based on the desired channel. The output of the oscillator is the channel frequency typically added to the intermediate frequency (IF).
What is the function of local oscillator?
What components make up the local oscillator and feedback?
Oscillator Gain With Feedback Inductors, capacitors or resistors are used to form a frequency selective resonant circuit, which is basically a passive band-pass filter that allows the desired frequency to pass, and a feedback network.
What is the function of local oscillator in AM receiver?
A local oscillator is a device that generates a sinusoidal signal with a frequency such that the receiver is able to generate the correct resulting frequency, or intermediate frequency (IF), for further amplification and conversion into audio detection.