National Instruments SCC-LP02 用户手册
SCC-LP Series Lowpass Filter Modules User Guide
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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.
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.
show the typical gain response curve for each SCC-LPXX.
Figure 2. Typical SCC-LP01 Response Curve
Frequency (Hz)
Amplitude (dB)
– 25.0
1
2
3
4
5
10
20 25
50
– 20.0
– 15.0
– 10.0
– 5.0
– 5.0
0.0