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The SCXI-1141/1142/1143 module filters are 8th-order elliptic, Bessel, and Butterworth lowpass filters, respectively. These filters are a hybrid of a switched-capacitor and a continuous-time architecture, thus providing good cutoff frequency control while avoiding the sampling errors found in conventional switched-capacitor designs. To better acquaint you with these filters, this section describes what the filters do and presents examples of how to use them on the SCXI-1141/1142/1143 module. Filter Theory Filters are generally grouped into one of five classifications—lowpass, highpass, bandpass, bandstop, and all-pass. These classifications refer to the frequency range (the passband) of signals that the filter is intended to pass from the input to the output without attenuation. Because the SCXI-1141/1142/1143 modules use a lowpass filter, this discussion is limited to lowpass filters. The ideal lowpass filter does not attenuate any input signal frequency components in the passband, which is defined as all frequencies below the cutoff frequency. The ideal lowpass filter completely attenuates all signal components in the stopband, which includes all frequencies above the cutoff frequency. The ideal lowpass filter also has a phase shift that is linear with respect to frequency. This linear phase property means that signal components of all frequencies are delayed by a constant time independent of frequency, thereby preserving the overall shape of the signal. In practice, real filters can only approximate the characteristics of an ideal filter. Figure 4-2 compares the attenuation of a real filter and an ideal filter
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