参数资料
型号: 12217
厂商: NVE Corp/Sensor Products
文件页数: 103/145页
文件大小: 0K
描述: MAGNET 3.5MM DIA X 4MM THICK
标准包装: 10
系列: *
其它名称: Q7078272A
Application Notes
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).
+5V
C1 0.1uF
+5V
C2 0.1uF
Use for AC
coupling
8 Vin+
5 Vout+
C3
R3
2 IN-
7
C3
RG
3 IN+
1 RG1
8 RG2
U2
INA118/BB
6
Vout
4 Vin-
1 Vout-
R3
5 REF
4
-5 V
Vref
I NSTRUMENTATION A MPLIFIER P REAMPLIFIER C IRCUIT
The gain of this circuit is:
V OUT = ? 1 +
? V IN + V ref
?
?
50K ?
R G ?
with V IN = (V out+ ) - (V out- ) and the frequency 3dB
point is given by f =
1
2 π R 3 C 3
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.
- 103 -
www.nve.com phone: 952-829-9217 fax: 952-829-9189
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