Applied Electronic Circuit

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Applied Electronic Circuit. #7 . 2007102832 . Instrumentation Amplifier : IA. High Input Impedance Low Output Impedance Accurate and Stable Gain (1 ~ 1000) High CMRR . Instrumentation Amplifier : IA. . For CMRR Tuning. Instrumentation Amplifier : IA. Differential Mode Input - PowerPoint PPT Presentation

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Applied Electronic Circuit

Applied Electronic Circuit#7 12007102832 #Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.1Instrumentation Amplifier : IA2High Input Impedance

Low Output Impedance

Accurate and Stable Gain (1 ~ 1000)

High CMRR #Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.2Instrumentation Amplifier : IA3For CMRR Tuning

#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.3Instrumentation Amplifier : IA4Differential Mode Input Differential Mode Output AmplifierOne Chip Instrumentation Amplifier

AD620 or etc#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.4Dual OP AMP Instrumentation Amplifier5Gain

#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.5Ground loop6Stray capacitor

Capacitor Capacitor#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.6Ground loop7CMRR R : lead wire !#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.7Shield Cable8cablecoaxial cableTriaxial cable#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.8Shield9220V60Hz

Shield() : ()Grounded Shield( )Chassis#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.9Shield10220V60HzGround ShieldShield interference DM current Leakage Current increased +

-IAShield #Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.10Shield11Active Shield(Driven Shield) +

-IA -

+ -

+Cable Shield Drive#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.11Shield12Active Shield & Ground Shield -

+ Ground Shield#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.12Transducer Bridge Amplifier13Resistive Sensor

Temperature ; Thermister, RTDLight ; Photoresistor

Strain ; Straingage

Pressure ; piezo resistive sensor -> -> #Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.13Bridge Circuit14AC

Capacitive sensorInductive Sensor Balanced

#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.14Conduction in Metal (Conductor)15+e-+e-+e-+e-+e-+e-+e-+e-+e-+e-+e-+e-mobilityn; conductivity = #Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.15Conduction in Metal (Conductor)16 N Free electronAL#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.16Conduction in Metal (Conductor)17(Temp wett.)#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.17Conduction in Metal (Conductor)18Ex. Pt RTD#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.18Conduction in Metal (Conductor)19Ex. Pt RTD

(xA)#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.19Conduction in Metal (Conductor)20Ex. Pt RTDTo prevent self heating 0.1V/ margin#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.20Conduction in Metal (Conductor)21Ex. Pt RTD , 0.26 #Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.21Bridge Balancing221% , 5% Bridge Arm Balancing ( )14-16V0-2V2mA14V1mA1mA

(xA)#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.22Bridge Balancing23To be safe, =14VTo be safe,#Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ.23