Analog Filter Wizard™ v1.0

## Design & Product Selection Tool

Definition of terms
 Power Supply Power supply definition goes here. Common Mode Voltage Common Mode Voltage definition goes here. Input Signal Level Input Signal Level definition goes here. Gain Gain definition goes here. Fo Center frequncy for bandpass filter.s Fc Cutoff frequency for highpass and lowpass filters. Q "Quality factor" of the filter. Q is directly related to peaking in the individual sections. Resistance The impedance at DC. Reactance The impedance at frequencies other than DC. α The damping ratio. Which is the inverse of Q (1/Q) (the quality factor Q). Filter Type This describes the transfer function of the filter: Lowpass, highpass or bandpass Highpass Passes frequencies above the cutoff, atenuates those below. Lowpass Passes frequencies below the cutoff, atenuates those above. Bandpass Passes frequencies around the center frequency, attenuates those on either side. Filter Response This describes the transfer function of the filter as it relates to amplitude and phase response. Standard responses that we support are Bessel, Butterworth, Chebyshev (0.01 dB to 1 dB), Equiripple (0.05° & 0.5°), Gaussian (6 dB & 12 dB). Filter Order Describes the attenuation rate. Each degree in the order provide 6 dB/octave (or 20 dB/decade) attenuation and 180° phase shift. Filter Topology Decribes the actual circuit schematic. H Filter gain (can also be called A). A Filter gain (can also be called H). S This is =jω. Filters are often described by the response in the s plane. The degree of s is the order of the filter. ω The frequency in radians/sec. = 1/2π the frequency in Hertz. Hertz The frequency in cycles/sec. Amax The maximum ripple in the amplitude of the filter in the passband. Amin The minimum attenuation in the stopband. Fmax [Fmax info goes here] Fs The edge of the stopband. Passband The band in which the signal remains unattenuated. Stopband The band beyond Fs. This is the band where the response of the filter never exceedes the minimum attenuation (Amin). Transition band The band between the [passband and the stopband. Transfer function The frequency response of a function or circuit. Usually given in terms of s.

 Legal Disclaimer:Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. back to top