2 0 Modes of Operation
(Continued)
MODE 5 Numerator Complex Zeros BP LP
(See
Figure 13
)
f
O
f
z
Q
Q
Z
H
0z1
e
MODE 6a Single Pole HP LP Filter (See
Figure 14
)
f
c
e
cutoff frequency of LP or HP output
e
R2 f
CLK
R2 f
CLK
e
0
0
1
1
a
b
R2 f
CLK
c
or
R4
100
R2
c
CLK
R4
0
f
or
100
0
1
R3
R2
R3
R1
1
a
b
R2 f
CLK
c
R4
50
R1 f
CLK
c
R4
50
R3 100
H
OLP
e b
H
OHP
e b
R3
R1
R2
R1
or
R3 50
e
0
1
a
R2 R4
c
e
0
1
b
R1 R4
c
MODE 6b Single Pole LP Filter (Inverting and Non-In-
verting) (See
Figure 15
)
e
gain at C Z output (as f
b
R2(R4
b
R1)
x
0 Hz)
x
f
CLK
2
f
c
e
cutoff frequency of LP outputs
j
R1(R2
a
R4)
H
0z2
e
gain at C Z output
H
OBP
e b
H
OLP
e b
J
R2
R1
R2 R4
J
R2
a
1
R1
a
a
c
R3
R2
as f
J
e
b
R2
R2 f
CLK
R2 f
CLK
or
R3 100
R3 50
R1
H
OLP1
e
1 (non-inverting)
H
OLP2
e b
R3
R2
c
R4
R1
TL H 10399 – 22
FIGURE 13 MODE 5
TL H 10399 – 23
FIGURE 14 MODE 6a
TL H 10399 – 24
FIGURE 15 MODE 6b
12
NSC [ NATIONAL SEMICONDUCTOR ]
