LTC2057/LTC2057HV
Typical applicaTions
DC Stabilized, Ultralow Noise Composite Amplifier
Input Voltage Noise Spectrum
of Composite Amplifier
20V
R
F
20
18
16
14
12
10
8
A
=
+ 1 = 101
V
R
G
+
LTC2057HV
–
47nF
20V
1MΩ
–20V
1k
6
20k
20V
OUT
4
V
+
IN
8
2
R
G
LT1037
V
0
20Ω
0.1
1
10
100
–
FREQUENCY (Hz)
2057 TA02b
R
F
–20V
2k
2057 TA02
COMPOSITE AMPLIFIER COMBINES THE EXCELLENT BROADBAND NOISE
PERFORMANCE OF THE LT1037 WITH THE ZERO-DRIFT PROPERTIES OF
THE LTC2057. THE RESULTING CIRCUIT HAS MICROVOLT ACCURACY,
SUPPRESSED 1/f NOISE, AND LOW BROADBAND NOISE.
Low-Side Current Sense Amplifier
Transfer Function
Low-Side Current Sense Amplifier
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
AMPLIFIER OUTPUT SATURATES
WITH DIODE SHORTED
28V
10Ω
1N4148
I
SENSE
+
–
OR EQUIVALENT
V
SENSE
V
LTC2057
OUT
+
R
SENSE
OPTIONAL
SHORT
–
1k
2057 TA03
10Ω
DIODE NOT SHORTED
DIODE SHORTED
IDEAL TRANSFER
FUNCTION
V
= 101 • R
• I
OUT
SENSE SENSE
0
10
15
30
5
20
25
V
(µV)
SENSE
2057 TA03b
2057f
23
For more information www.linear.com/LTC2057
LINEAR_DIMENSIONS [ Linear Dimensions ]
