"Filter Designer" calculates multistage analog active filters.Convenience, visibility and ability to find an optimal solution in minimum time.*** No ads, No Internet required. **** Low-pass filters* High-pass filters* Band-pass filters* Band-stop filters* All-pass filtersResponses:* Bessel* Butterworth* Chebyshev* Linear Phase 0.05 degrees* Linear Phase 0.5 degrees* Gaussian to 6dB* Gaussian to 12dBTopologies:* Real Pole Non-Inverting* Real Pole Inverting* Real Pole Fully Differential* Multiple-Feedback, Single-Ended Input* Multiple-Feedback, Fully Differential* Multiple-Feedback, Differential Input for 2-nd order LP* In-The-Loop, Single-Ended Input* In-The-Loop, Fully Differential* Sallen-Key* RLC for 2-nd order LPF* 3d and 4th order low-pass filter with one Op Amp* 3d order high-pass filter with one Op AmpTuning of the values of all circuit components.Monte-Carlo worst-case analysisReverse: calculation of filter parameters at known values of its components.Auxiliary tools."Circuit Calculator" has the same user interface, so you can try "Circuit Calculator Demo" before you buy:https://play.google.com/store/apps/details?id=com.vdv.circuitcalculator.demo