# Cascaded `Noise Factor`

of RF system

For components like op-

Block Diagram -

Sub block has gains G1, G2 and G3.

Sub-

k is Boltzman constant,

T is temperature (degrees Kelvin) and

B is frequency bandwidth (in Hz).

`Noise Factor`

of RF systemFor components like op-

Block Diagram -

In above diagram, we have noise contributions by each sub-block as (Fn-1)kTB.

Sub block has gains G1, G2 and G3.

Sub-block has individual noise contribution as F1, F2 and F3.

k is Boltzman constant,

T is temperature (degrees Kelvin) and

B is frequency bandwidth (in Hz).

Sub block has gains G1, G2 and G3.

Sub-

k is Boltzman constant,

T is temperature (degrees Kelvin) and

B is frequency bandwidth (in Hz).

Rest of our calculations are based on the equivalent noise Factor of the system with cascaded components. In order to calculate total noise factor, we will need to refer the noise back at the input of the system. Block diagram below shows the Total Noise contributions.

Block Diagram: N access noise contributions at the input of system.

Total noise factor at the input of the system is calculated with formula below:

Total Noise Factor of cascaded system with 3 blocks is below

Ftotal = F1+(F2-1)/G1+ (F3-1)/(G1G2)

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