HBM Genesis GEN5i User Manual page 386

Butterworth IIR Filter
When Butterworth IIR filter is selected, this is always a combination of an analog Butterworth anti alias filter and a digital Butterworth IIR filter.
Analog anti alias filter bandwidth
Analog anti alias filter characteristic
Butterworth IIR filter characteristic
Butterworth IIR filter user selection
Butterworth IIR filter bandwidth (ωc)
Butterworth IIR passband ripple (δp)
Butterworth IIR passband (ωp)
Butterworth IIR filter stopband attenuation (δs)
Butterworth IIR filter roll-off
(1) Measured using Fluke 5700A calibrator, DC normalized
386
Figure A.42: Digital Butterworth IIR Filter
450 kHz ± 25 kHz (-3 dB)
7-pole Butterworth, extended passband response
8-pole Butterworth style IIR
Auto tracking to sample rate divided by: 4, 10, 20, 40
User selects divide factor from current sample rate, software then adjusts filter when sample
rate is changed.
User selectable from 1 Hz to 50 kHz
(1)
0.1 dB
DC to 35 kHz @ ωc = 50 kHz
-75 dB
-48 dB/octave
Figure A.43: Butterworth IIR 50 kHz Overview and passband flatness
(1)
GEN5i
I2679-4.0 en