Voltage reference source with high-order temperature compensation circuit

Abstract

A voltage reference source with high-order temperature compensation circuit belongs to the electronic technical field. The voltage reference source comprises a starting current and positive temperature coefficient current generating circuit, a negative temperature coefficient current generating circuit, a high-order temperature compensation current generating circuit and a superimposition and summation output circuit. The added high-order temperature compensation current generating circuit performs linearization to the breakover voltage VBE between the voltage of the base and emitter of a triode to obtain a high-order compensation amount which is in agreement with the high-order temperature amount of the PN junction voltage, and the high-order temperature coefficient of the PN junction voltage can be eliminated fundamentally after proportional offset, thus realizing a CMOS voltage reference source with the lower temperature coefficient. The voltage reference source is prepared by the common CMOS technology with lower cost, has extremely low temperature coefficient, less power consumption and smaller area, and can be used in the reference circuits such as analog circuits and digital-analog hybrid circuits which are required to have low temperature coefficients.

Description

technical field [0001] The invention belongs to the field of electronic technology and relates to a voltage reference source, in particular to a CMOS voltage reference source with a high-order temperature compensation current generating circuit, which is mainly used in reference circuits that need to generate low temperature coefficients in analog and digital-analog hybrid circuits. Background technique [0002] Reference source circuits are required in analog, digital-analog hybrid, and even pure digital circuits. The reference source circuit is required to maintain a stable output when the power supply voltage or temperature changes, and at the same time, it is required not to change with the change of the process. According to the different output modes, the reference circuit can be divided into: voltage-type reference source (a circuit aimed at outputting a constant voltage) and a current-type reference source (a circuit aimed at outputting a constant current). [0003]...

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Problems solved by technology

However, the above-mentioned methods only realize a function of a certain power to partially compensate the high-order temperature coefficient of the PN junction voltage, and are highly sensitive to the process.

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