参数资料
型号: AG003-01E
厂商: NVE Corp/Sensor Products
文件页数: 102/145页
文件大小: 0K
描述: ASSEMBLY CURRENT SENSOR EVAL
标准包装: 1
传感器类型: 磁性 GMR(大型磁阻传感)
接口: 模拟
嵌入式:
已供物品: 板,CD
已用 IC / 零件: AA 系列电流传感器
产品目录页面: 2839 (CN2011-ZH PDF)
相关产品: 391-1054-5-ND - SENSORS MAGNETIC FIELD LP 8-SOIC
391-1052-5-ND - SENSORS MAGNETIC FIELD 8SOIC
391-1050-5-ND - SENSORS MAGNETIC FIELD 8SOIC
391-1049-5-ND - SENSORS MAGNETIC FIELD 8MSOP
391-1048-5-ND - SENSORS MAGNETIC FIELD 8SOIC
391-1045-5-ND - SENSORS MAGNETIC FIELD 8SOIC
391-1032-5-ND - SENSORS MAGNETIC FIELD 8MSOP
391-1030-5-ND - SENSORS MAGNETIC FIELD 8MSOP
AB001-02-ND - SENSORS MAGNETIC FIELD 8SOIC
391-1020-5-ND - SENSORS MAGNETIC FIELD LP 8-SOIC
更多...
其它名称: 391-1060
Application Notes
Three Op Amp Bridge Amplifier
The three op-amp circuit shown in the figure below is the most robust version of an op amp
implementation. In this circuit the CMRR still depends on the resistor ratios of the differential
amplifier (U4) but is not dependent on the resistors R1, RG, and R2. Therefore to minimize common
mode errors the gain of the first stage should be made large compared to the gain of the second stage.
The minimum gain of the second stage is dependent on amplifiers U2 and U3 output voltage range and
Op Amp U4’s common-mode input range, which for the LMC7101, is rail-to-rail allowing a gain of
one (1) in the second stage.
+5V
C2 0.1uF
3 +
7 V+
U2
2 -
LMC7101A/NS
4 V-
6
Vref
+5V
C1 0.1uF
R4
R6
+5V
C4 0.1uF
R2
8 Vin+
5 Vout+
RG
+5V
C3 0.1uF
3 +
2 -
7 V+
U4
LMC7101A/NS
4 V-
6
Vout
1 Vout-
3 +
7 V+
4 Vin-
2 -
U3
LMC7101A/NS
4 V-
6
R3
R5
R1
T HREE O P A MP P REAMPLIFIER C IRCUIT
The DC transfer function of the circuit is:
Vout = V ref + ? 1 +
? ?
? V IN for R 1 = R 2 , R 3 = R 5 , R 4 = R 6 and V IN =(V out+ ) - (V out- )
?
?
2R 1 ? ? R 4 ?
R G ? ? R 3 ?
The symmetrical nature of this configuration also allows for cancellation of common mode errors in
amplifiers U2 and U3 if the errors track.
- 102 -
www.nve.com phone: 952-829-9217 fax: 952-829-9189
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