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Amplificadores de Transimpedancia

Dudas, comentarios sobre la teoria de instrumentacion electronica

Re: Amplificadores de Transimpedancia

Notapor charly » Vie, 23 Mar 2012, 12:55

Voltage Feedback Vs CurrentFeedback Op Amps

http://www.ti.com/lit/an/slva051/slva051.pdf

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 Ideal Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
3 Ideal Models with Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4 Frequency Dependant Gain Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5 Feedback with Frequency Dependant Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Appendix A Derivation of Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A−1
List of Figures
1 Ideal Op Amp Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Noninverting Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 Frequency Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Feedback with Frequency Dependant Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Bode Plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
charly
 
Mensajes: 188
Registrado: Lun, 11 Jul 2011, 08:56


Re: Amplificadores de Transimpedancia

Notapor charly » Vie, 23 Mar 2012, 13:08

Selecting High-Speed Operational Amplifiers Made Easy

http://www.ti.com/lit/an/sloa051a/sloa051a.pdf

1 Introduction .................................................................................................................................. 2
2 Voltage Feedback and Current Feedback.................................................................................... 2
2.1 Voltage-Feedback Op Amps ..................................................................................................... 2
2.2 Current-Feedback Op Amps ..................................................................................................... 3
2.3 Applying Current-Feedback Op Amps....................................................................................... 3
3 Compensated vs Uncompensated Op Amps............................................................................... 6
4 Differential vs Single-Ended Op Amps ........................................................................................ 9
5 Putting It All Together: Selecting the Right High-Speed Op Amp............................................ 10
5.1 Any Differential Load............................................................................................................... 10
5.2 High Speed............................................................................................................................ 10
Figures
1 Ideal Voltage-Feedback Op Amp.....................................................................................................2
2 Ideal Current-Feedback Op Amp.....................................................................................................3
3 Gain Stage Topology for Voltage and Current-Feedback Op Amps.................................................4
4 Use of a Current-Feedback Op Amp as a Unity Gain Buffer............................................................4
5 Low Pass Filter With a Current Feedback Op Amp..........................................................................5
6 Two-Pole Low Pass Filter With Current Feedback Op Amps...........................................................5
7 Effect of Capacitance at the Inverting Input .....................................................................................6
8 Load Capacitance Causes Instability...............................................................................................7
9 Load Capacitance Can Be Isolated With a Resistor ........................................................................7
10 Lead Compensation for Load Capacitance......................................................................................8
11 Lead Compensation for Inverting-Input Capacitance .......................................................................8
12 Traditional Method of Interfacing to Differential-Input A/D Converters .............................................9
13 Improved Differential A/D Interface................................................................................................10
Tables
1 Voltage- and Current-Feedback Characteristics ..............................................................................3
2 High-Speed Op Amp Parameters ..................................................................................................12
charly
 
Mensajes: 188
Registrado: Lun, 11 Jul 2011, 08:56


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