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Supply-voltage-splitter

2017-08-21 22:10  
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This simple circuit can convert a single supply voltage, such as a battery, into a bipolar supply. Sense resistors Rl and R2 establish relative magnitudes for the resulting positive and negative voltages. Their rail-to-rail value, of course, equals VsUPPLY?· R4 and R5 represent the load impedances. For example, equalvalue sense resistors produce 1/z VsvPPLY across each of the load resistors, R4 and R5.
Supply-voltage-splitter

The op amp maintains these equal voltages by sinking or sourcing current through R3; the op amp`s action is equivalent to that of variable conductances Gland G2 in shunt with each load resistor. Choose a value for R3 so that the largest voltage across it, the greatest load-current mismatch, won`t exceed the op amp`s output-voltage capability for the application. You can add a buffer amplifier at the op amp`soutput to provide greater load currents. Ifyou need bypass capacitors across the load resistors as well, connect a capacitor (dashed lines) to ensure that the amplifier remains stable.



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