Engineering:Intermediate-Frequency (IF) amplifier

Intermediate-Frequency (IF) amplifiers are amplifiers used to raise signal levels in stereo systems.

Uses

IF amplifiers can change the frequency levels in circuits that are too selective, difficult to tune, and unstable. It also helps by changing the frequency levels in circuits which improve image display and tuning range. It is a fixed frequency amplifier which rejects unwanted signals.

Commonly used circuits

• Mutual inductance coupling: contains two windings that are joined by mutual inductance.
• Shunt capacitance coupling: These circuits have a wide pass band.
• composite IF transformers: receivers used for A-M and F-M receivers.