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 From: Michael Hill Subject: [Discuss-gnuradio] XCVR2450 Gain Calculations: AD8132 Low Cost High Speed Differential Amplifier Date: Tue, 21 Aug 2012 21:27:13 +0930

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?

Thanks,

-Michael

http://en.wikipedia.org/wiki/Friis_formulas_for_noise

 2.45 GHz Gain (dB) Gain Noise Figure (dB) Noise Factor Wire -1 0.794328235 1 1.258925412 F1 1.258925412 c Switch -0.75 0.841395142 0.75 1.188502227 (F2-1)/G1 0.237310244 b Diplexer -0.7 0.851138038 0.7 1.174897555 (F3-1)/(G1*G2) 0.261687958 a Band Pass Filter -2.2 0.602559586 2.2 1.659586907 (F4-1)/(G1*G2*G3) 1.1595034 i Maxim2829 30 1000 0 1 (F5-1)/(G1*G2*G3*G4) 0 j AD8132 10 1001 (F5-1)/(G1*G2*G3*G4) 2.917427014 Total F 5.834854028 7.660299957 dB 5.4 GHz Gain (dB) Gain Noise Figure (dB) Noise Factor Wire -1 0.794328235 1 1.258925412 F1 1.258925412 c Switch -0.9 0.812830516 0.9 1.230268771 (F2-1)/G1 0.289891207 b Diplexer -1.6 0.691830971 1.6 1.445439771 (F3-1)/(G1*G2) 0.68990452 i Maxim2829 30 1000 0 1 (F4-1)/(G1*G2*G3) 0 j AD8132 10 1001 (F5-1)/(G1*G2*G3*G4) 2.238721139 Total F 4.477442277 6.510299957 dB