Active filters are vital in modern electronics; every data acquisition systems need them for bandwidth-limiting signals before ADCs as anti-aliasing filters, or after DACs as anti-imaging filters. Instrumentation also relies on them for accurate signal measurements. Active filters are used for cutoff frequencies that range from sub -1 Hz to 10 MHz, where passive filter designs would require prohibitively large component values and sizes. Their design and verification can be tedious and time consuming.
WEBENCH® Filter Designer lets you design, optimize, and simulate complete multi-stage active filter solutions within minutes. Create optimized filter designs using a selection of TI operational amplifiers and passive components from TI's vendor partners.
SELECT from Lowpass, Highpass, Bandpass, and Bandstop filter types. Specify performance constraints for attenuation, group delay, and step response. Choose from a variety of filter responses such as Chebyshev, Butterworth, Bessel, transitional Gaussian to 6 dB, transitional Gaussian to 12 dB, linear phase 0.05°, and linear phase 0.005°. Determine the filter response best suited for your design by optimizing for pulse response, settling time, lowest cost, pass-band ripple, and stop-band attenuation.
DESIGN your filter using Sallen-Key, multiple feedback, and Bainter topologies. Select the best operational amplifiers for your design by evaluating gain bandwidth vs. current vs. cost and other parameters. Specify your resistor/capacitor tolerances between ideal, 0.1%, 1%, 2%, and 5% values. Experiment with user-defined capacitor seed values. Optimize your filter topologies for sensitivity, lowest cost, and smallest footprint.
ANALYZE your design by running SPICE electrical simulation with closed-loop frequency response, step response, and sine-wave response analysis options.
See Filter Designer for step-by-step instructions on how to use the tool