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Summary form only given. The goal of this work is to show a software package, based in Matlab, that simplifies the process of designing analog filters. This package is menu oriented using the Matlab capabilities for doing so. The package is able to design lowpass, highpass, bandpass, and bandreject filters. The approximation magnitude responses can be Butterworth (maximally flat magnitude), Chebyshev (equal-ripple), Inverse Chebyshev, and Elliptic ones. In the case of phase response we have the Thomson one (maximally flat delay) also known as Bessel response. The output for the approximation stage is a set of data that includes the transfer function poles and zeros, quadratic factors for both numerator and denominator polynomials, and the numerator and denominator polynomials. The network realizations can be either passive or active realizations. For the passive realizations we have the low sensitivity ladder realization. This realization is available for any approximation type. In the case of the active realizations we have implemented the cascade of biquad stages but we are working in the active ladder realization. For the biquad stages available we have the Sallen-Key realization, multiple feedback, state-variable KHN, state variable Tow-Thomas, and the GIC based biquad.