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SCC-LP Series Lowpass Filter Modules User Guide 10 ni.com
Theory of Operation
SCC-LPXX Performance
The SCC-LPXX uses a Butterworth filter, which is characterized by
maximal flatness in the passband with very sharp monotonic rolloff. It has
a nonlinear phase response, the delay is not constant, and the step response
exhibits a moderate amount of overshoot (ringing). These characteristics
present no problems in applications where only the amplitude of signal
frequency components is of interest.
The Butterworth filter is a good general-purpose filter. Figures 2 through 5
show the typical gain response curve for each SCC-LPXX.
Figure 2. Typical SCC-LP01 Response Curve
Frequency (Hz)
Amplitude (dB)
– 25.0
1234510202550
– 20.0
– 15.0
– 10.0
– 5.0
– 5.0
0.0