Function of local oscillator in superheterodyne 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.

1. What is the function of local oscillator in receiver?
2. What is the function of the mixer and local oscillator in radio receiver?
3. What is the function of mixer in superheterodyne receiver?
4. What is the function of the oscillator?

What is the function of local oscillator in receiver?

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

The function of a mixer is to convert RF energy to intermediate frequency (IF) energy with minimum loss and without spurious responses. The inputs to the mixer are the signal at the radio frequency and the sinusoid from a local oscillator (LO). The output is the signal at the intermediate frequency.

What is the function of mixer in superheterodyne receiver?

The mixer is a critical stage of the RF signal chain in a superheterodyne (superhet) receiver architecture. It allows the receiver to be tuned across a wide band of interest, then translates the desired, arbitrary received signal frequency to a known, fixed frequency.

What is the function of the oscillator?

Oscillators convert direct current (DC) from a power supply to an alternating current (AC) signal. They are widely used in many electronic devices ranging from simplest clock generators to digital instruments (like calculators) and complex computers and peripherals etc.