What is image frequency and intermediate frequency?
In heterodyne receivers, an image frequency is an undesired input frequency equal to the station frequency plus (or minus) twice the intermediate frequency. For example, an AM broadcast station at 580 kHz is tuned on a receiver with a 455 kHz IF. The local oscillator is tuned to 580 + 455 = 1035 kHz.
What is intermediate frequency transformer?
[‚in·tər′mēd·ē·ət ¦frē·kwən·sē tranz′fōr·mər] (electronics) The transformer used at the input and output of each intermediate-frequency amplifier stage in a superheterodyne receiver for coupling purposes and to provide selectivity.
Which is an example of an intermediate frequency?
The Intermediate frequency concept is applied in RF transceivers used for various wireless systems. Refer Upconverter vs Downconverter and RF Transceiver design to understand RF Up conversion and downconversion process. The intermediate frequency for AM receiver is 455 kHz and for FM receiver it is 10.7 MHz.
What are the benefits of an intermediate frequency in RF?
Summary Many RF systems incorporate an intermediate frequency (IF) that is lower than the carrier frequency and higher than the baseband frequency. An IF-based receiver is known as a heterodyne receiver. The use of an IF simplifies the design of tunable receivers and reduces the number of components that must be compatible with high frequencies.
Why does a tunable receiver not use an intermediate frequency?
If a tunable receiver does not use an intermediate frequency, all of the high-frequency circuitry must be compatible with the full range of possible carrier frequencies; this is undesirable, because it is easier to design RF components and circuits that are optimized for a small range of signal frequencies.
Which is better an intermediate frequency or a direct conversion?
A receiver that shifts the signal down to the baseband instead of the IF is referred to as a direct-conversion (or homodyne, or zero-IF) architecture. Are the traditional benefits of an intermediate frequency still—i.e., in the context of modern RF systems—sufficient reason for choosing IF over a direct-conversion approach?