单电源运放 A Single-Supply Op-Amp Circuit Collection
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Application Report
SLOA058– November 2000
1
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.
Contents
1 Introduction ................................................................................................................................... 3
1.1 Split Supply vs Single Supply.................................................................................................... 3
1.2 Virtual Ground........................................................................................................................... 4
1.3 AC-Coupling ............................................................................................................................. 4
1.4 Combining Op-Amp Stages ...................................................................................................... 5
1.5 Selecting Resistor and Capacitor Values .................................................................................. 5
2 Basic Circuits ................................................................................................................................ 5
2.1 Gain.......................................................................................................................................... 5
2.2 Attenuation ............................................................................................................................... 6
2.3 Summing .................................................................................................................................. 9
2.4 Difference Amplifier .................................................................................................................. 9
2.5 Simulated Inductor.................................................................................................................... 9
2.6 Instrumentation Amplifiers ...................................................................................................... 10
3 Filter Circuits ............................................................................................................................... 12
3.1 Single Pole Circuits................................................................................................................. 13
3.1.1 Low Pass Filter Circuits .............................................................................................................13
3.1.2 High Pass Filter Circuits.............................................................................................................13
3.1.3 All-Pass Filter ............................................................................................................................14
3.2 Double-Pole Circuits ............................................................................................................... 15
3.2.1 Sallen-Key.................................................................................................................................15
3.2.2 Multiple Feedback (MFB)...........................................................................................................16
3.2.3 Twin T .......................................................................................................................................17
3.2.4 Fliege ........................................................................................................................................20
3.2.5 Akerberg-Mossberg Filter ..........................................................................................................22
3.2.6 BiQuad......................................................................................................................................24
3.2.7 State Variable............................................................................................................................25
4 References................................................................................................................................... 25
Appendix A – Standard Resistor and Capacitor Values ................................................................. 26
Figures
1 Split Supply (L) vs Single Supply (R) Circuits ..................................................................................3
2 Single-Supply Operation at Vcc/2....................................................................................................4
3 AC-Coupled Gain Stages ................................................................................................................6
4 Traditional Inverting Attenuation With an Op Amp ...........................................................................6
5 Inverting Attenuation Circuit ............................................................................................................7
6 Noninverting Attenuation .................................................................................................................8
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