A stochastic delay-derivative element (SDDE) using an immiscible polymer binary mixture of poly(L-lactic acid) with poly(ε-caprolactone) is fabricated, which is useful for a basic electronic component in a novel bioinspired signal/information processing device. Noise power spectral density(PSD) that is a Fourier transform of temporal correlation function of electric current fluctuations for SDDEs is investigated and the correlation between morphology of the binary mixture and PSD is explored. The PSD is varied with depended on the fabrication processes of SDDE and cooling procedure after the isothermal crystallization of PLLA.