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Amplificadores de instrumentacion Apuntes

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Re: Amplificadores de instrumentacion Apuntes

Notapor blas » Vie, 13 Abr 2012, 11:40

The Instrumentation Amplifier Handbook



INSTRUMENTATION AMPLIFIERS 2-1
Overview 2-1
THE WHEATSTONE BRIDGE SENSOR 2-2
Error Sources 2-5
AMPLIFIER TOPOLOGIES 3-1
The Difference Amplifier 3-1
The “Classical” Three Op Amp Instrumentation Amplifier 3-3
Internal vs. External Gain Setting Resistors 3-7
The Two Op Amp Instrumentation Amplifier 3-8
AVOIDING INSTRUMENTATION AMPLIFIER PITFALLS 4-1
Input Bias Current Effects 4-1
Avoiding the “Reference Pin” Trap 4-5
A Common Mistake: Floating Inputs 4-8
Common- Mode Voltage Limitations 4-11
Calculating Common Mode Voltage Range Painlessly 4-12
Maintaining “Truth In Output” 4-18
Noise Filtering The IA Input The Wrong Way—Making A Bad Situation Worse 4-20
SOLVING THE GROUND LOOP PROBLEM 5-1
What Are “Ground Loops”? 5-1
Op Amps and Ground Loops 5-1
Instrumentation Amplifiers and Ground Loops 5-2
OFFSET VOLTAGE TRIM 5-3
Trimming Offset Voltage At The Input 5-3
Trimming Offset Voltage Using REF Pin 5-4
BOOSTING THE OUTPUT 5-4
Driving Heavy Loads : The Wrong Way 5-4
Driving Heavy Loads : The Right Way 5-5
APPLICATION CIRCUITS: GENERAL 6-1
A +/-20V Input Diff Amp With +/-200V CMV Applications Circuit 6-1
Two and Three Op Amp IA Applications 6-3
Difference Amplifier Applications In Single- Ended Circuits 6-3
APPLICATIONS CIRCUITS: AUDIO 6-10
Low Noise Applications 6-10
Low Distortion Applications 6-11
DIFFERENCE AMPLIFIER INPUT RESISTANCE 6-12
APPLICATIONS CIRCUITS: CURRENT MEASUREMENT 7-1
Current Shunts 7-1
Low-Side Current Sensing 7-2
High- Side Current Sensing 7-5
MICROPOWER & BATTERY - POWERED APPLICATIONS 8-1
Single Supply Considerations 8-1
Minimizing Supply Current 8-4
APPLICATIONS CIRCUITS: UNUSUAL 8-7
Extending Common Mode Range To 1kV 8-7
An Adjustable Gain Difference Amplifier 8-8
Advantages Of Assymmetrical Power Supplies 8-10
VLF & LF Loop Antenna Amplifiers 8-10
APPLICATIONS CIRCUITS: OPTOELECTRONICS 8-10
Differential Photodetectors (“Edge Detectors”) 8-10
X-Y Position (Quadrant) Detectors 8-10
CW Diode Laser Current Driver 8-10
SELECTING YOUR INSTRUMENTATION AMPLIFIER 9-1
Sensor Source Impedance Considerations 9-1
Very High Impedance Sensor 9-1
Very Low Impedance Sensor 9-3
Power Supply Constraints 9-3
Common Mode Voltage Range Requirements 9-4
Improving Common Mode Rejection 9-4
Bandwidth And Settling Time 9-9
Noise And Distortion 9-10
“Rail- To- Rail” Input & Output Swing 9-12
RFI PROBLEMS 10-1
Input Rectification- the Most Common Problem 10-1
Typical Instrumentation Amplifier Swept- Power RFI Tests 10-2
Input RFI Filtering 10-4
Other RFI Considerations 10-9
MISCELLANEOUS APPLICATIONS CIRCUITS 11-1
Absolute- Value Amplifier 11-1
AVOIDING DIFFERENCE AMPLIFIER PITFALLS 12-1
Adding External Resistors—Don’t!! 12-1
Adding External Resistors—Sometimes? 12-4
blas
 
Mensajes: 201
Registrado: Mié, 15 Feb 2012, 19:50


Re: Amplificadores de instrumentacion Apuntes

Notapor charly » Vie, 25 May 2012, 11:34

TEMA 9 AMPLIFICADORES DIFERENCIALES Y DE INSTRUMENTACION rev 2.



9-1 OBJETIVOS.
9-2 PREGUNTAS DE AUTOEVALUACIÓN.
9-3 AMPLIFICADORES DIFERENCIALES.
9-4 AMPLIFICADORES DE INSTRUMENTACIÓN.
Medidor de pH con IA.
Amplificador de señal de puente de Wheatstone.
Anemómetro de alambre caliente.
Lazo de corriente 4 a 20 mA.
Báscula electrónica.
Circuito de protección de entrada.
9-5 CIRCUITOS DE PROCESAMIENTO DE SEÑAL.
Integrador.
Derivador.
Amplificadores Logarítmicos y Antilogarítmicos.
9-6 RESUMEN DE AMPLIFICADORES BIOELÉCTRICOS.
9-7 CUESTIONARIO.
1
charly
 
Mensajes: 188
Registrado: Lun, 11 Jul 2011, 08:56


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