railway RRB JE (CBT I + CBT II) Mock Test 2024 Communication Systems Noise in Analog Communication System Noise Temperature and Noise Figure
The RF amplifier A is having 3 dB NF & 5 dB of gain, amplifier B is having 3.5 dB NF & 15 dB. For overall noise figure of the cascaded system, the correct statement is:
1
A as first stage & B as second stage offers minimum over all NF
2
B as first stage & A as second stage minimum over all NF
3
Both the combination will offer same overall NF
4
Over all NF will be less than 3 dB