Pass band filter 20Hz-20kHz with R thermal noise sources

Passive band pass filter of bandwidth 20Hz-20kHz. Resistor's inherent thermal noise is represented as a separated AC source (Vrms). Vinn values calculated according to Johnson–Nyquist noise: Vinn=sqr(4*Kb*K*R)*sqr(BW) Pass band filter transfer function: H(s)= (s/w1)/[(s/W1 + R1/R2 + 1)(s/W2 + 1)-(R1/R2)] Pass band filter transfer function with noise refered to the input: H(s)_n= (1+ s/w1 + sqr(R1/R1))/[(s/W1 + R1/R2 + 1)(s/W2 + 1)-(R1/R2)] Filtro Pasa banda Pasivo de 2do Orden RC. Ancho de banda . Con fuentes de ruido.