Intermediate-frequency amplifier
Intermediate-frequency (IF) amplifiers are amplifier stages used to raise signal levels in radio and television receivers, at frequencies intermediate to the higher radio-frequency (RF) signal from the antenna and the lower (baseband) audio or video frequency that the receiver is recovering.[1]
Uses
[edit | edit source]IF amplifiers in heterodyne receivers apply gain in a frequency band between the input radio frequency and output audio frequency or video frequency, often following one stage of RF amplifier. This allows most of the gain in the form of a fixed-frequency amplifier, simplifying tuning. Compare to its predecessor, the tuned RF receiver. IF amplifiers might use double-tuned amplifiers or staggered tuning to generate the appropriate frequency response needed. Some use more than one IF frequency.
Commonly used circuits
[edit | edit source]- 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.[2][3]
References
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- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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External links
[edit | edit source]Error creating thumbnail: File missing Media related to Lua error in Module:Commons_link at line 62: attempt to index field 'wikibase' (a nil value). at Wikimedia Commons
