High Quality Content by WIKIPEDIA articles! Passive integrator circuit is a simple four-terminal network consisting of two passive elements. It is also the simplest (first-order) low-pass filter.A transfer ratio is a gain factor for the sinusoidal input signal with given frequency.A transfer function shows the dependence of the transfer ratio from the signal frequency, given that the input signal is sinusoidal. A passive integrator circuit is often used in cheap digital audio systems (i.e. cheap soundcards) as a reconstruction filter.

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