IF amplifier perform the following functions(choose one or multiple applicable)Group of answer choicesto achieve good sensitivityto accept only IF frequency and reject othersdemodulate the signalmix both signals the incoming and the local oscillaotor signals.to achieve good selectivityproduce local frequency in order to tune receiver

The IF (Intermediate Frequency) amplifier in a radio receiver performs the following functions:

1. To achieve good sensitivity: The IF amplifier amplifies the signal that has been converted to the intermediate frequency. This allows the receiver to pick up weak signals and still produce a usable output.

2. To accept only IF frequency and reject others: The IF amplifier is designed to have a narrow bandwidth that is centered on the IF. This means it will amplify signals at the IF and attenuate signals at other frequencies. This is a key part of the selectivity of the receiver.

3. To achieve good selectivity: As mentioned above, the narrow bandwidth of the IF amplifier contributes to the selectivity of the receiver. Selectivity is the ability of the receiver to separate signals on different frequencies.

The IF amplifier does not demodulate the signal, mix signals, or produce local frequency. These are functions of other parts of the receiver. The demodulator (or detector) is the part of the receiver that extracts the information from the carrier wave. The mixer is the part of the receiver that combines the incoming signal with the signal from the local oscillator to produce the IF. The local oscillator is the part of the receiver that generates the local frequency.