Three-junction bandgap circuit with zero Kelvin reference voltage

Abstract

The invention discloses a three-junction bandgap circuit with zero Kelvin reference voltage, and belongs to the technical field of integrated circuits. The circuit comprises a voltage generation module, a voltage bootstrap module and a voltage summation module. The voltage generation module comprises three diodes, and the three diodes are biased by positive temperature coefficient current and constant current to obtain output voltage of the three diodes; the voltage bootstrap module comprises three voltage bootstrap units, three input ends of the three voltage bootstrap units are correspondingly connected with cathodes of three diodes in the voltage generation module, and gains are carried out on output voltages of the three diodes to obtain three gain voltages; and the three input ends of the voltage summation module are correspondingly connected with the output ends of the three voltage bootstrap units, and summation is carried out on the three gain voltages to obtain a reference voltage. All temperature nonlinearity is ideally eliminated, the defects of a band-gap circuit in the prior art are overcome, and the temperature dependence of reference output voltage is eliminated.

Description

technical field [0001] The present application relates to the technical field of integrated circuits, in particular to a triple-junction bandgap circuit with a zero-Kelvin reference voltage. Background technique [0002] The reference voltage source is an important part of an analog integrated circuit. In many integrated circuits (such as analog-to-digital converters, digital-to-analog converters, linear regulators and switching regulators), precise and stable voltage references are required, regardless of Whichever scenario is used, it is required that the output voltage of the voltage reference does not change with the voltage, the voltage changes little when the temperature fluctuates, and the output voltage cannot be affected by the process. [0003] Aiming at the problem of the influence of temperature fluctuations on voltage, in the prior art, it is usually attempted to reduce the degree of temperature dependence by reducing the temperature curvature or introducing a s...

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Problems solved by technology

[0004] The present invention provides a three-junction bandgap circuit with a zero-Kelvin reference voltage to solve the problem in the prior art that the additional term or multiple terms will not naturally track the nonlinearity in the original reference output, so cumbersome adjustments are required to obtain the reference The problem of lowering the temperature coefficient

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