microwave software®
Utilities+® User Manual
RF/Microwave Design Utility Programs
CASCADE
NOISE FIGURE
The sketch below shows a three-stage cascade of two amplifiers and a mixer. Each element is specified in terms of noise figure and gain. Note that the gain of a passive element, in this case a mixer, is actually a loss so its gain is entered as a negative number.
The sketch below shows a three-stage cascade of two amplifiers and a mixer. Each element is specified in terms of noise figure and gain. Note that the gain of a passive element, in this case a mixer, is actually a loss so its gain is entered as a negative number.
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Cascade Noise Figure
Calculate the noise figure and noise temperature of a cascaded network Enter # of Stages [<Enter>=Quit] ? _ |
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Enter NF and Gain of Stage 1 : ? _
Enter NF and gain of Stage 1 as "2,10" (note the comma between the two numbers) and press <Enter>.
In similar fashion, enter the NF and gain of the remaining two stages. Note that the entry for Stage 2 should be "7,-7" because it's a passive element.
Here is the output calculation for the three-stage cascade:
Noise Figure = 4.871 dB
Noise Temp = 600.238 deg K
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