On Tue, Aug 21, 2012 at 4:57 AM, Michael Hill
<address@hidden> wrote:
Hi All,
I'm looking at the parts of the XCVR2450 trying to do theoretical gain / noise calcs.
My first question is... has anyone else done these? Do my numbers seem reasonable?
Secondly.. I don't know what gain the AD8132 has.. it seems to offer G =1,2,5,10 according to page 15...
Should I be assuming the Gain is maxed out to 10?
http://www.analog.com/en/specialty-amplifiers/differential-amplifiers/ad8132/products/product.html
Thanks,
-Michael
http://en.wikipedia.org/wiki/Friis_formulas_for_noise
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| 2.45 |
GHz |
|
Gain (dB) |
Gain |
Noise Figure (dB) |
Noise Factor |
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Wire |
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-1 |
0.794328235 |
1 |
1.258925412 |
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F1 |
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1.258925412 |
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| c |
Switch |
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-0.75 |
0.841395142 |
0.75 |
1.188502227 |
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(F2-1)/G1 |
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0.237310244 |
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| b |
Diplexer |
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-0.7 |
0.851138038 |
0.7 |
1.174897555 |
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(F3-1)/(G1*G2) |
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0.261687958 |
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| a |
Band Pass Filter |
-2.2 |
0.602559586 |
2.2 |
1.659586907 |
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(F4-1)/(G1*G2*G3) |
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1.1595034 |
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| i |
Maxim2829 |
30 |
1000 |
0 |
1 |
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(F5-1)/(G1*G2*G3*G4) |
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0 |
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| j |
AD8132 |
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10 |
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1001 |
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(F5-1)/(G1*G2*G3*G4) |
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2.917427014 |
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| Total |
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F |
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5.834854028 |
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7.660299957 |
dB |
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| 5.4 |
GHz |
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Gain (dB) |
Gain |
Noise Figure (dB) |
Noise Factor |
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Wire |
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-1 |
0.794328235 |
1 |
1.258925412 |
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F1 |
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1.258925412 |
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| c |
Switch |
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-0.9 |
0.812830516 |
0.9 |
1.230268771 |
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(F2-1)/G1 |
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0.289891207 |
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| b |
Diplexer |
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-1.6 |
0.691830971 |
1.6 |
1.445439771 |
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(F3-1)/(G1*G2) |
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0.68990452 |
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| i |
Maxim2829 |
30 |
1000 |
0 |
1 |
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(F4-1)/(G1*G2*G3) |
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0 |
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| j |
AD8132 |
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10 |
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1001 |
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(F5-1)/(G1*G2*G3*G4) |
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2.238721139 |
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| Total |
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F |
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4.477442277 |
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6.510299957 |
dB |
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