Browse Prior Art Database

Monolithic Voltage Reference Source

IP.com Disclosure Number: IPCOM000085261D
Original Publication Date: 1976-Mar-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Delaporte, F: AUTHOR

Abstract

This is a precision voltage reference source suitable for monolithic microcircuit integration which provides improved characteristics over known methods.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Monolithic Voltage Reference Source

This is a precision voltage reference source suitable for monolithic microcircuit integration which provides improved characteristics over known methods.

The circuit is based on the fact that the voltage differential between two matched diodes is only dependent on the junction temperature and on the ratio of currents into the diodes, as already disclosed by Karel E. Kuijk in an article published in the IEEE Journal of Solid-State Circuits, Vol. SC-8, nr. 3, June 1973, pp. 222-226.

The circuit proposed here includes a voltage or current source feeding two circuits in parallel. The first circuit comprises a resistor R1 and n diodes in series, while the second comprises m diodes in series with a resistor R2. The end of the second circuit is grounded, while the end of first circuit provides the reference voltage output, an operational amplifier Aop being connected as shown in the figure.

Depending on the number of diodes m and n and of the values of resistors R1 and R2, the temperature coefficient can be made positive, negative or null.

This circuit may be converted into a circuit for measuring temperatures by doing m=n. Then the output voltage becomes temperature dependent according to the relation: V = n kT over q log (I2) over I1 = n log kT over q log (R1) over R2.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]