HBM Genesis GEN5i User Manual page 387

Elliptic IIR Filter
When Elliptic IIR filter is selected, this is always a combination of an analog Butterworth anti alias filter and a digital Elliptic IIR filter.
Analog anti alias filter bandwidth
Analog anti alias filter characteristic
Elliptic IIR filter characteristic
Elliptic IIR filter user selection
Elliptic IIR filter bandwidth (ωc)
Elliptic IIR passband ripple (δp)
Elliptic IIR passband (ωp)
Elliptic IIR filter stopband attenuation (δs)
Elliptic IIR filter roll-off
(1) Measured using Fluke 5700A calibrator, DC normalized
I2679-4.0 en
Figure A.44: Digital Elliptic IIR Filter
450 kHz ± 25 kHz (-3 dB)
7-pole Butterworth, extended passband response
7-pole Elliptic 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 filter bandwidth (ωc)
-75 dB
-72 dB/octave
Figure A.45: Elliptic IIR 50 kHz Overview and passband flatness
(1)
GEN5i
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