Filter
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Sallen-Key High-Pass Filter
3-7
Example Circuits
Figure 3–5. Sallen-Key High-Pass Filter With Single Supply Using Area 200
C206 C207
C209
C210
V2+
V2–
V2+
GND2
V2–
Power Supply Bypass
+
–
14
1
4
3
2
V2+
V2–
R212
C215
R216 C211
R221
R220
R218
R219
R217
R215
C212
C213
A2OUT
1/2 Dual Op Amp
A201–
A202–
A203+
A204+
+
–
R206
C202
R207 C203
R204
R203
R202
R201
R209
C204
C201
B2OUT
1/2 Dual Op Amp
B201–
B202–
B204+
B203+
R211
C
R
A
U202
R213
Voltage Reference
U201A
U201B
V2+
VREF2 = 2.5 V
R210
13
11
12
+
–
V
in
Jumper
Not Used
Jumper
Jumper
R205
CnC
Jumper
mR
TL431ACLP
Jumper
0.1 µF 10 µF
fo =
1
2π √mn
RC
Q =
√mn
m+1
V
OUT
= V
IN
–(f/fo)
2
1+(j/Q)(f/fo) – (f/fo)
2
+ VREF2
Jumper B204 + to VREF2
2.2 kΩ
6
A2/SD
A2 FLT
9
B2/SD
B2 FLT
C208
10 µF
R208
C205
R214
C214
R