Reference Instruction Manual

The discrete equivalent form is:
21
2
0
azaz
zb
++
where:

2
2
2
2
1
44
8
2
ω
ω
ω
++
−
=
T
T
d
T
a

2
2
2
2
2
44
4
4
ω
ω
ω
ω
++
−+
=
T
T
d
T
d
T
a

2
2
2
210
44
4
1
ω
ω
ω
++
=++=
T
T
d
aab
7.2.2 Notch Filter Element
(Represented by Second-order Block)
The basic continuous-time notch filter element is:
2
222
2
2
111
2
2
1
2
2
2
2
ωω
ωω
ω
ω
+⋅⋅⋅+
+⋅⋅⋅+
sds
sds
where:
 ω
1
= 2π · f
1
, and f
1
[Hz] is the notch frequency.
 ω
2
= 2π · f
2
, and f
2
[Hz] is the notch frequency.
 d
1
is the notch damping.
 d
2
is the double-pole damping.
The discrete equivalent form is:
21
2
21
2
0
azaz
bzbzb
++
++
where:

q
cp
b
1
11
0
++
=
,
q
p
b
)1(2
1
1
−
=
,
q
cp
b
1
11
2
+−
=
,
q
cp
a
1
22
2
+−
=

q
p
abbba
)1(2
1
2
22101
−
=−−++=
assuming:
SimplIQ for Steppers Application Note Filters
MAN-STECR (Ver. 1.1)
87