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158
Advanced Filters
Frequency Response Graphs
These graphs illustrate the frequency response of the different filters at 12 and 24 dB/oct.
Each stage of the Gaussian filter has the same ENBW as a single stage of the RC filter.
Each stage of the Linear Phase filter has the same roll-off as a single stage of the RC
filter.
-20
-40
-60
-80
-100
-120
-140
-160
SR865A DSP Lock-in Amplifier
0
0.1
0
-20
-40
-60
-80
0.1
Advanced filters
more bandwidth
1
Frequency (f
)
c
Advanced filters
more bandwidth
1
Frequency (f
)
c
Appendix A
12dB/oct
RC
Gaussian (FIR)
Linear Phase
Gaussian
23dB better
rejection
10
24dB/oct
RC
Gaussian (FIR)
Linear Phase
Gaussian
46dB better
rejection
10
100
100
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