Circuit Design 0.75V Voltage Reference

Exactly what accuracy do you need? What is the application?

as to the accuracy, i donnt need quite high precision. it can be better stay the .001 level. my mean is : i just want the voltage to stay at 0.75V, all the reference voltage 0.751 to 0.759 are available for my circuit design.

The application: i view the 0.75V reference voltage to be one part of non-inverting voltage adder circuit.

any suggestion? thanks.

Numbers,

This shows a 2V voltage regulation which will operate on input voltages greater than 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.

It is important to use an operational amplifier with low quiescent current such as an LM108. The quiescent current flows through R2 and tends to turn on Q2. However, the value shown is low enough to insure that Q2 can be turned off.

You will notice that pin 3 of the Op Amp is compared to the feed back voltage at pin 2. If R2 and R3 were values that produce Vout of 0.75V then would that solve your problem?

Kuduk

hey,Kuduk, thanks for your reply. it's a good idea to design a 0.75V circuit with the materials you offered. i'll try to match the value of the resistor for my design. i think i can solve the problem now.really thanks.