R3
3MΩ
9
68MΩ(1)
2
R1
11kΩ(2)
3MΩ
10
1µF
22pF
R2
100kΩ
D
R4
330kΩ
M
6
14
1N4148s
15
OPA177
LA
100MΩ(4)
D
330kΩ
1W
High
A2
13
11
A1
17
16
1N4148s 300kΩ
12
Low
7
D1
D3
D2
D4
0.47µF(3)
4
100kΩ
330kΩ
1
1W
3
RA
RL
O/P PWR
19
+
–
Pulse GEN
20
15VDC
0.47µF
24V
0.5W
I/P PWR
NOTES: (1) Bandpass 0.05Hz to 100Hz. (2) Adjustable resistor may be used to achieve max common-mode
rejection between LA /RA and RL.(3) Negative 15V supply may be connected in place of 0.47µF capacitor if available.
(4) See offset trimming section.
FIGURE 6. ECG Amplifier.
+V
D1
9
2
+V
330kΩ
LA
3MΩ
10
1/2
OPA1013
D
D2
–V
300kΩ
M
–V
6
14
D
R1
20kΩ
High
Out
15
A2
R2
20kΩ
20
+V
D3
+V
Low
Out
17
13
1/2
16
A1
330kΩ
OPA1013
RA
19
7
11
270kΩ
100kΩ
12
–V
3MΩ
D4
–V
3656
4
0.1µF
1
R3
3
VO
0.1µF
3MΩ
24V
0.5W
+V
R4
+V
–V
OPA177
–
+
id
15VDC
D1 = D2 = D3 = D4 = 1N459
–V
FIGURE 7. Driven Right-Leg Amplifier.
®
12
3656
BB [ BURR-BROWN CORPORATION ]
