Low drift voltage reference

Abstract

Circuits and method for providing voltage reference circuits that include low drift over time and lower operating voltages are provided. Generally, it is desirable that a reference circuit provide an accurate and precise reference over time. The voltage reference circuits described can provide for good long term stability, operation at lower voltages than prior designs, consistent output voltage with reduced variability due to process changes and mismatches, low noise in the reference voltage, and other advantages.

Description

technical field [0001] The present disclosure relates to a method and apparatus for generating a voltage that can be used as a reference in a system such as an integrated circuit. Background technique [0002] A voltage reference is typically provided by an electronic circuit that provides a constant voltage at the output of the circuit with no fluctuations even when temperature or power supply changes that normally or otherwise cause voltage fluctuations. As a result, it is desirable that a voltage reference provide a point of reference even as system conditions change. Voltage references are used in supply voltage regulators, analog-to-digital converters, digital-to-analog converters, and many other measurement and control systems. Typically, a reference voltage can be generated by balancing a voltage that increases with increasing temperature and decreases with decreasing temperature. [0003] The voltage proportional to absolute temperature (PTAT) increases with temper...

AI Technical Summary

Problems solved by technology

The problem with conventional voltage references involves the instability of the reference over time

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