AG920-07E NVE, AG920-07E Datasheet - Page 103

• Manufacturer Part Number: AG920-07E
• Description: KIT EVALUATION GT SENSOR
• Manufacturer: NVE

Specifications of AG920-07E

• Sensor Type: Magnetic. GMR (Giant Magnetoresistive)
• Interface: Analog
• Embedded: No
• Utilized Ic / Part: ABL & AKL Series GT Sensors
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Sensitivity: -
• Sensing Range: -
• Other names: 391-1063

Instrumentation Amplifier Bridge Preamplifier
The advent of low-cost, high-performance Instrumentation Amplifier (IAs) such as the Analog Devices
AD620 and the Burr Brown INA118 have greatly simplified the design of bridge preamplifiers while
adding significant advantages in noise, size, and performance over op amp implementations. The
figure below shows the design of a bridge amplifier circuit using an INA118 (the Analog Devices
AD620 is pin-for-pin compatible with the INA118).
The gain of this circuit is:
point is given by f
Integrated circuit instrumentation amplifiers utilize circuit techniques where resistor matching is not as
critical to the CMRR as active device matching. Active device matching can be easily controlled on
integrated circuits allowing for greatly improved CMRR of instrumentation amplifiers over op amp
implementations. Also, the gain-bandwidth product of instrumentation amplifier circuits can be higher
than op amp circuits.
V
O U T
=



1
8 Vin+
4 Vin-
+
50K
R
I
+5V
NSTRUMENTATION
G



=
V
C1 0.1uF
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1 Vout-
2
5 Vout+
IN
π
R C
+
1
3
V
3
C3
re
C3
f
R3
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R3
A
with V
Use for AC
MPLIFIER
coupling
RG
- 103 -
Vref
3 IN+
1 RG1
2 IN-
8 RG2
5 REF
IN
= (V
P
REAMPLIFIER
INA118/BB
out+
+5V
7
4
) - (V
U2
Application Notes
-5 V
C2 0.1uF
out-
6
) and the frequency 3dB
C
IRCUIT
Vout