LM158,A-LM258,A-LM358,A
HIGH INPUT Z, DC DIFFERENTIAL AMPLIFIER
USING SYMMETRICAL AMPLIFIERS TO
REDUCE INPUT CURRENT
R4
100k
R2
100k
1/2
LM158
W
W
eo
I I
I
B
R1
100k
W
e I
R3
100k
I
I
B
B
W
2N 929
1/2
LM158
1/2
LM158
V
o
+V1
+V2
m
0.001 F
I
B
1/2
LM158
if R1 = R5 and R3 = R4 = R6 = R7
W
3M
e
= [ 1 +
] ( (e + e )
2R1
-----------
R2
o
2 1
Input current compensation
I
B
As shown e = 101 (e + e )
o
2
1
W
1.5M
HIGH INPUT Z ADJUSTABLE GAIN DC
INSTRUMENTATION AMPLIFIER
LOW DRIFT PEAK DETECTOR
R1
100k
W
R3
100k
R4
100k
W
W
1/2
LM158
I
B
e1
eO
1/2
1/2
LM158
LM158
Gain adjust
eo
R2
I
B
W
2k
1/2
LM158
R5
100k
W
Zo
C
2I
e I
B
1m F
R6
100k
R7
100k
W
W
ZI
1/2
LM158
2N 929
0.001
m
F
e2
I
2I
B
B
if R1 = R5 and R3 = R4 = R6 = R7
R
1/2
LM158
3R
3M
e
= [ 1 +
] ( (e + e )
2R1
-----------
R2
o
2 1
1M
W
W
Input current
compensation
I
B
As shown e = 101 (e + e )
o
2
1
ACTIVE BAND-PASS FILTER
R1
100k
W
C1
330pF
1/2
LM158
R2
R5
470k
100k
W
W
+V1
R4
10M
W
1/2
LM158
C2
R6
470k
330 F
p
R3
100k
W
W
Vo
1/2
LM158
R7
100k
W
VCC
C3
R8
100k
m
10 F
W
8/12
STMICROELECTRONICS [ ST ]
