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Ham Radio 2000 #2
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Ham Radio 2000 - Volume 2.iso
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HAMV2
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MISC
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RF
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NOISE.TXT
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1996-06-22
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820b
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14 lines
This routine computes the overall performance of a number (>1) of cascaded
stages. The noise figure (in dB), gain (in dB) and IP3 (in dBm, refereed to
the output) are entered for each stage. The routines computes:
1) Overall noise factor, noise figure (dB) and noise temperature (K)
2) Overall gain (just adds up individual stages)
3) Input intercept (dBm) and output intercept (dBm)
4) The Minimum detectable signal (MDS). This is the smallest useable signal at
the input, without it being below the noise level. Its equal to kTB(NF-1).
5) The maximum (IPmax) level of one of two equal tones at f1 and f2, that may
be applied to the input without the 3rd order product (2 f1 - f2 or 2 f2 - f1)
being above the noise level.
6) The two-tone dynamic range, which is the difference between the MDS and IPmax