RF Amplifiers Flashcards
1
Q
How can selectivity be achieved in the front-end circuitry of a communications receiver?
A
By using a preselector.
2
Q
What is the primary purpose of an RF amplifier in a receiver?
A
To improve the receiver’s noise figure.
3
Q
How much gain should be used in the RF amplifier stage of a receiver?
A
Sufficient gain to allow weak signals to overcome noise generated in the first mixer stage.
4
Q
Too much gain in a VHF receiver front end could result in this:
A
Susceptibility of intermodulation interference from nearby transmitters.
5
Q
What is the advantage of a GaAsET preamplifier in a modern VHF radio receiver?
A
High gain and low noise floor.
6
Q
In what stage of a VHF receiver would a low noise amplifier be most advantageous?
A
Front end RF stage.
