# US 2017/0255221 A1 · Voltage reference circuit

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- Number: US 2017/0255221 A1
- Document ID: US20170255221A1
- Status: Published application
- Kind: A1
- Application number: 15/464,056
- Filed: 2017-03-20
- Published: 2017-09-07
- Earliest claimed: 2014-05-07
- Assignees: Analog Devices Global
- Applicants: Analog Devices Global
- Inventors: Stefan Marinca; Gabriel Banarie
- Web page: https://patentgrep.com/patent/US20170255221A1

## CPC

- G05F 3/30: Regulators using the difference between the base-emitter voltages of two bipolar transistors operating at different current densities (G05F3/26 takes precedence)
- G05F 3/16: being semiconductor devices
- G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

## Abstract

The present disclosure relates to a method and apparatus for generating a voltage reference. More particularly the present disclosure relates to a methodology and circuitry configured to provide an output signal that combines a proportional to absolute temperature component with a complimentary to absolute temperature component to generate a stable output which is not temperature dependent.

## Claims

### Claim 1

A voltage reference circuit comprising:
a first set of circuit components configured to generate a proportional to absolute temperature, PTAT, signal that is dependent on a base emitter voltage difference between first and second bipolar transistors operating at different current densities;
a second set of circuit components configured to generate a complimentary to absolute temperature, CTAT, signal;
the circuit being configured to couple the CTAT signal component to the PTAT signal to provide at an output of the circuit an output voltage that is first order temperature insensitive and wherein only the second set of circuit components are used in a calibration of the circuit.