Describe RF amplifiers and their two classes.
What will be an ideal response?
RF (radio-frequency) amplifiers usually are the first stage in AM, FM, or TV receivers and are similar to other amplifiers. They differ primarily in the frequency spectrum over which they operate, which is 10,000 to 30,000 megahertz. There are two classes of RF amplifiers: untuned and tuned. In an untuned amplifier, a response is desired over a large RF range, and the main function is amplification. In a tuned amplifier, high amplification is desired over a small range of frequencies or a single frequency. Normally, when RF amplifiers are mentioned, they are assumed to be tuned unless otherwise specified.
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