
SimplIQ Software Manual 13BFilters
MAN-SIMSW (Ver. 1.4)
14-7
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:
⎟
⎠
⎞
⎜
⎝
⎛
=
2
tan
2
T
d
c
k
k
k
ω
,
2
2
tan
1
⎟
⎠
⎞
⎜
⎝
⎛
=
T
p
k
k
ω
, ( 2,1
k )
1
22
++= cpq
14.2.3 Double-lead Element
(Represented by Second-order Block)
The basic continuous-time double lead-lag element is:
2
⎟
⎠
⎞
⎜
⎝
⎛
+
+
⋅
bs
as
a
b
The frequency a / (2
π
) [Hz] is the lead corner frequency. The frequency b / (2
π
) [Hz] is the lag
corner frequency.
The discrete equivalent form is:
2
-z
)-z(1
G)-(1 G
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
+
β
β
Order Parameter
1
k
1
= (1 - β)
2
2 k
2
= Gβ · (Gβ + 2 · (1 - β))
3
k
3
= - (Gβ)
2
4
k
4
= β
2
The DC gain of this block is unity.
β is selected as β = e
-bt
.
G is selected by
a
b
G
=
, with 0 < β < 1 and 1 < G < 3.
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