Noise power spectral density (PSD) (V^2/Hz):

kB = Boltzmann’s constant (1.38065×10^−23 J/K), T = Temperature (K), R = Resistance (ohms)

Power across resistor (W):

Capacitor RMS noise voltage (V):

(R*f term is substituted with 1/4C: web.mit.edu/klund/www/papers/UNP_noise.pdf)

Capacitor noise charge (C):

Capacitor noise energy (J):

Resistor noise PSD at very high frequencies: