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Tension de desviacion de entrada en un operacional

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Tension de desviacion de entrada en un operacional

Notapor blas » Mar, 20 Mar 2012, 11:58

Última edición por blas el Mar, 20 Mar 2012, 12:02, editado 1 vez en total
blas
 
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Re: Tension de desviacion de entrada en un operacional

Notapor blas » Mar, 20 Mar 2012, 12:00

DC Parameters: Input Offset Voltage (VIO)
http://www.ti.com/lit/an/sloa059/sloa059.pdf

1 Introduction...................................................................................................................................2
2 Input Offset Voltage Defined........................................................................................................3
3 Cause of VIO ..................................................................................................................................4
4 VIO and Temperature Drift in the Major Device Types ................................................................5
4.1 Bipolar.....................................................................................................................................6
4.2 BiFET......................................................................................................................................8
4.3 CMOS.....................................................................................................................................8
5 Manufacturer Measurement, Trim, and Specification of VIO ......................................................9
5.1 Measurement..........................................................................................................................9
5.2 Trim.......................................................................................................................................10
5.3 Specifications........................................................................................................................10
6 Impact of VIO on Circuit Design and Methods of Correction....................................................15
6.1 AC Coupling..........................................................................................................................16
6.2 DC Feedback ........................................................................................................................18
6.3 Internal Calibration ................................................................................................................18
6.4 External Calibration...............................................................................................................20
7 Summary .....................................................................................................................................22
References..........................................................................................................................................23
Figures
Figure 1. Ideal Op-Amp Model and Model Parameters ..................................................................3
Figure 2. Nonideal Op-Amp Model..................................................................................................3
Figure 3. Distribution of VIO for the TLV2721 .................................................................................4
Figure 4. Simplified Differential-Pair Amplifier. Q1 and Q2 Are BJT, FET or MOS. .....................5
Figure 5. Bipolar Transistor Differential-Pair Circuit. (a) Basic Circuit and (b) General Circuit
Used to Calculate VIO .......................................................................................................6
Figure 6. Simplified Servo-Loop Test Circuit ...............................................................................10
Figure 7. Graph of VIO Drift Over 0–70 C ......................................................................................12
Figure 8. VIO vs VIC for (a) TLC071 and (b) TLC081 Op Amps .....................................................14
Figure 9. VIO Changes With Common Mode Input Voltage (VIC) for (a) the TLV247x and (b) the
TLV2731 ..........................................................................................................................15
Figure 10. Inverting Op-Amp Circuit With VIO Included.................................................................15
Figure 11. AC Coupled Inverting Amplifier ....................................................................................16
Figure 12. General Form of DC Feedback Loop.............................................................................18
Figure 13. Simplified Block Diagram of the TLC2654 Chopper-Stabilized Amplifier ..................19
Figure 14. Block Diagram of Channel One of the TLC4502...........................................................20
Figure 15. Typical Null Configuration of an Amplifier ...................................................................21
Figure 16. VIO Adjustment With (a) Potentiometer and (b) Low Temperature Coefficient
Resistor...........................................................................................................................21
Tables
Table 1. Range of Input Offset Voltage and Drift Per Device Process........................................6
Table 2. Example of VIO Specifications Taken From TLE2021 Data Sheet (SLOS191) ............11
Table 3. Converter Resolution.....................................................................................................17
blas
 
Mensajes: 201
Registrado: Mié, 15 Feb 2012, 19:50


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