RADIO FREQUENCY STAGE

Transmitters and Receivers Glossary

Transmitters and Receivers — Radio Frequency Stage

 

 

 

 

 

 

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Information on Radio Frequency Stage (RF Stage)

The incoming signal is very weak and must be amplified by the RF stage before being passed to the mixer. The RF stage must also prevent certain troublesome frequencies. The RF stage therefore consists of RF amplifierand pre-selection sections. In summary, the RF stage of a superheterodyne receiver must perform the following principal functions:

  • It must couple the antenna to the receiver in an efficient manner so that further power is not lost from the weak signal.
  • It must generate as little noise as possible so that the signal-to-noise ratio is made any worse by the receiver itself.
  • It must provide gain.
  • It must suppress signals at or near the image and the intermediate frequencies.
  • It must operate linearly to avoid the production of inter-modulation products.
  • It should minimise the number of frequencies appearing at the input to the mixer that could result in cross-modulation products.
  • It must screen the LO from the antenna to prevent the LO frequency from being radiated.


    • Other topics in our resources on Transmitters and Receivers related to Radio Frequency Stage include: 
     
  • Radio-frequency amplifier (RF Amplifier)
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  • pre-selection

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