This is a design circuit for voltage regulator. This circuit is based on LM108 National Semiconductor Op Amp. This is the figure of the circuit;
The 2V voltage regulation which will operate on input voltages of only 3V. An LM113 is the voltage reference and is driven by a FET current source, Q1. An operational amplifier compares a fraction of the output voltage with the reference. Drive is supplied to output transistor Q2 through the Va power lead of the operational amplifier. Pin 6 of the op amp is connected to the LM113 rather than the output since this allows a lower minimum input voltage. The dynamic resistance of the LM113 is so low that current changes from the output of the operational amplifier do not appreciably affect regulation. Frequency compensation is accomplished with both the 50 pF and the 1 mF output capacitor.
[Circuit source: National Semiconductor Notes]
The 2V voltage regulation which will operate on input voltages of only 3V. An LM113 is the voltage reference and is driven by a FET current source, Q1. An operational amplifier compares a fraction of the output voltage with the reference. Drive is supplied to output transistor Q2 through the Va power lead of the operational amplifier. Pin 6 of the op amp is connected to the LM113 rather than the output since this allows a lower minimum input voltage. The dynamic resistance of the LM113 is so low that current changes from the output of the operational amplifier do not appreciably affect regulation. Frequency compensation is accomplished with both the 50 pF and the 1 mF output capacitor.
[Circuit source: National Semiconductor Notes]
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