The Designer's Guide Community Forum https://designers-guide.org/forum/YaBB.pl Modeling >> Behavioral Models >> Baseband Equivalent RF Transceiver https://designers-guide.org/forum/YaBB.pl?num=1112006038 Message started by uncle_ezra on Mar 28th, 2005, 2:33am

Title: Baseband Equivalent RF Transceiver Post by uncle_ezra on Mar 28th, 2005, 2:33am Hi, I have a question related to amplifier noise modeling in simulink. So for Noise I am basically calculating the noise power (equation below) of the amplifier itself and using the Bandlimited White Noise provided in simulink Noise_Power=(10^(0.1*NF) - 1) * 10^(0.1*Gain) * 2*4*k*T*R NF=Noise Figure in dB Gain=Gain of the amplifier in dB Basically I add the input signal with the Bandlimited White Noise. Is this a reasonable model?  If not how would you recommend I model Noise Figure. Thanks

Title: Re: Baseband Equivalent RF Transceiver Post by hjee on Sep 27th, 2005, 7:41pm Basicly, it's better to know the noise model is input equivalent or output equivalent. Then you'd better to declare the match impedence R to generate the noise pwr 4kRT - which is also referred to source noise. noise factor = SNR|output / SNR|input noise figure(NF) = 10*log(noise factor) SNR|output = S|input * Gain^2 / N|input+N|amp_output SNR|input   = S|input/N|input => noise factor = Gain^2*N|input / (N|input+N|amp_output) Up to now, we can model or derive the output equivalent noise N|amp_output At last, we can also derive the input equivalent noise, N|input = N|amp_output / Gain^2 Above is the basic noise modeling for LNA in RF receiver.

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