Coleccion de circutos con opamp

Application Report
SLOA058– November 2000

A Single-Supply Op-Amp Circuit Collection
Bruce Carter Op-Amp Applications, High Performance Linear Products One of the biggest problems for designers of op-amp circuitry arises when the circuit must be operated from a single supply, rather than ±15 V. This application note provides working circuit examples.

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Contents Introduction................................................................................................................................... 3 1.1 Split Supply vs Single Supply.................................................................................................... 3 1.2 VirtualGround........................................................................................................................... 4 1.3 AC-Coupling ............................................................................................................................. 4 1.4 Combining Op-Amp Stages ...................................................................................................... 5 1.5 Selecting Resistor and Capacitor Values.................................................................................. 5 Basic Circuits ................................................................................................................................ 5 2.1 Gain.......................................................................................................................................... 5 2.2 Attenuation............................................................................................................................... 6 2.3 Summing .................................................................................................................................. 9 2.4 Difference Amplifier .................................................................................................................. 9 2.5 SimulatedInductor.................................................................................................................... 9 2.6 Instrumentation Amplifiers ...................................................................................................... 10 Filter Circuits ............................................................................................................................... 12 3.1 Single PoleCircuits................................................................................................................. 13
3.1.1 Low Pass Filter Circuits .............................................................................................................13 3.1.2 High Pass FilterCircuits.............................................................................................................13 3.1.3 All-Pass Filter ............................................................................................................................14

3.2 Double-Pole Circuits ............................................................................................................... 15
3.2.1 3.2.2 3.2.3 3.2.4 3.2.5 3.2.6 3.2.7Sallen-Key.................................................................................................................................15 Multiple Feedback (MFB)...........................................................................................................16 Twin T .......................................................................................................................................17 Fliege........................................................................................................................................20 Akerberg-Mossberg Filter ..........................................................................................................22 BiQuad ......................................................................................................................................24 State...