Genesis GEN3t, Руководство пользователя

Страница: 496 / 1124

Bessel Filter (Analog Anti
-
Alias)
δs
ωp ωs
Passband Stopband
δp : Passband ripple
δs: Stopband attenuation
ωp
ωc
ωs
: Passband frequency
: Corner frequency
: Stopband frequency
Frequency [kHz]
Magnitude [dB]
ωc
1 + δp
1 - δp
-3 dB
Figure A.62: Bessel Filter
When Bessel filter is selected, this is only the analog Bessel anti
-
alias filter and not a digital filter.
Bessel filter bandwidth
10 MHz
±
1 MHz (
-
3 dB)
Bessel filter characteristic
6
-
pole Bessel, optimal step response
Bessel filter 0.1 dB passband flatness
(1) DC to 500 kHz
Bessel filter stop band attenuation (δs) 60 dB
Bessel filter roll
-
off
36 dB/Octave
Frequency [MHz]
Frequency [MHz]
± 2 V Bessel overview ± 2 V Bessel passband flatness
0.001 0.01 0.1 1 10 100 0.001 0.01 0.1 1 10 100 100
-150
-130
-110
-90
-70
-50
-30
-10
10
0
M
a
g
n
it
u
d
e
[dB]
M
a
g
n
it
u
d
e
[dB]
M
a
g
n
it
u
d
e
[
%
]
2.33
1.74
1.15
0.57
-0.57
0
-1.14
-1.71
-2.28
Frequency [MHz] Frequency [MHz]
± 20 V Bessel overview ± 20 V Bessel passband flatness
M
a
g
n
it
u
d
e
[dB]
M
a
g
n
it
u
d
e
[dB]
0.001 0.01 0.1 1 10 100 100
-150
-130
-110
-90
-70
-50
-30
-10
10
0.001 0.01 0.1 1 10 100
0
M
a
g
n
it
u
d
e
[
%
]
2.33 0.2
0.15
0.1
0.05
0
-0.05
-0.1
-0.15
-0.2
0.2
0.15
0.1
0.05
0
-0.05
-0.1
-0.15
-0.2
1.74
1.15
0.57
-0.57
-1.14
-1.71
-2.28
0
Figure A.63: Representative Bessel examples
(1) Measured using Fluke 5700A and 5820A calibrators, DC normalized
GEN3t
496 I3995-3.1 en HBM: public