Microwave Engineering -- Noise figure of a cascade

In summary, the noise figure of a cascade is the measure of noise added by a series of components in a microwave system. It differs from the noise figure of individual components by considering the cumulative effect of noise. Factors such as component noise figure, system gain and losses, and interconnection can affect the noise figure of a cascade. It is typically measured using a noise figure analyzer. Minimizing the noise figure of a cascade is important for maintaining signal-to-noise ratio and improving overall system performance and sensitivity.
  • #1
peripatein
880
0
Hi,
I am taking a course in Microwave Engineering and we were given the following problem to solve
An amplifier with a gain of 12 dB, a bandwidth of 150 MHz, and a noise figure of 4 dB feeds a
receiver with a noise temperature of 900 K. Find the noise figure of the overall system.
Need I to use the following relation?:
Fcas=F1 + (F2-1)/G = F1 + (T/T0)/G? Where T=900 K and T0=290 K.
I'd appreciate some guidance.
 
Physics news on Phys.org
  • #2
You don't need any guidance since you got it right the 1st time! :smile: (assuming your G = 101.2).
 

Related to Microwave Engineering -- Noise figure of a cascade

What is noise figure of a cascade?

Noise figure of a cascade refers to the measure of the amount of noise added by a series of cascaded components in a microwave system. It is an important parameter that determines the overall noise performance of the system.

How is noise figure of a cascade different from noise figure of individual components?

Noise figure of a cascade takes into account the cumulative effect of noise from each component in a series, while noise figure of individual components only considers the noise added by that specific component.

What factors affect the noise figure of a cascade?

The noise figure of a cascade can be affected by various factors, such as the noise figure of individual components, the gain and losses of the system, and the interconnection between components.

How is the noise figure of a cascade measured?

The noise figure of a cascade is typically measured using a noise figure analyzer, which injects a known level of noise into the system and measures the output signal to determine the overall noise figure.

Why is minimizing noise figure of a cascade important?

Minimizing the noise figure of a cascade is important in order to maintain the signal-to-noise ratio of a system. Lower noise figure results in better performance and sensitivity of the system, making it more reliable for scientific and industrial applications.

Similar threads

Engineering Noise Floor/Device Temperature Problem
    • Engineering and Comp Sci Homework Help
Replies
3
Views
1K
TV antenna amplifier noise calculation
    • Engineering and Comp Sci Homework Help
Replies
4
Views
1K
Modern Digital Audio: Understanding Dither and Oversampling in Hi-Res Age"
    • Computing and Technology
Replies
9
Views
1K
Carrier-to-Noise Ratio Question
    • Engineering and Comp Sci Homework Help
Replies
1
Views
2K
Antenna gain and tv Resistance requirements
    • Engineering and Comp Sci Homework Help
Replies
1
Views
2K
Cascading low pass op amps, derive expression for f3db
    • Engineering and Comp Sci Homework Help
Replies
1
Views
4K
Noise Modelling - Digital communication systems
    • Introductory Physics Homework Help
Replies
2
Views
1K
  • Poll
Microwave Engineering by David Pozar
    • Science and Math Textbooks
Replies
4
Views
5K
Noise Calculations for OP27 Op-Amp
    • Electrical Engineering
Replies
18
Views
7K
Communication Problems (Filters, BW, Bit rate, FM)
    • Engineering and Comp Sci Homework Help
Replies
2
Views
4K

Hot Threads

Recent Insights

Back
Top