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# Voltage Reference Circuit

IP.com Disclosure Number: IPCOM000079795D
Original Publication Date: 1973-Sep-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 27K

IBM

## Related People

Scotto, VA: AUTHOR

## Abstract

The circuit configurations shown solve the problem of setting an accurate positive and/or negative-voltage reference when the zener voltage VZ is greater than V1 and V2, but less than V1 + V2.

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Voltage Reference Circuit

The circuit configurations shown solve the problem of setting an accurate positive and/or negative-voltage reference when the zener voltage VZ is greater than V1 and V2, but less than V1 + V2.

Fig. 1 shows the circuit for generating a -3 volt reference. V1 is at +6 volts and VZ is at +6 volts. Feedback resistors R2 and R3 are placed across the zener diode and are made equal. Resistor R1 is such that there is a 3 volt drop across it, making a high-impedance positive-reference voltage VO2 of +3 volts available. A 6 volt drop across the zener diode is split with a 3 volt drop across R2 and a 3 volt drop across R3, which makes available a low-impedance negative-reference voltage VO1 of -3 volts.

Fig. 2 shows a similar circuit for generating a low-impedance positive- reference voltage VO1 and a high-impedance negative-reference voltage VO2. With the zener diode at +6 volts and -V2 at -6 volts, VO1 will be +3 volts and VO2 will be -3 volts.

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