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No need for precision resistors is the benefit in comparison with the approach with an inverting op amp configuration. The simple schematic with a shunt device (LT1021) also does not need precision resistors. So I wonder why should I choose the complex one?
A simple negative voltage reference circuit is shown in the following schematic:
while a complex negative voltage reference circuit, where there is an integrator, is shown in the following schematic:
What is the benefit of the integerator in the complex circuit in comparison with the simple...
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