Voltage reference circuit fixable in temperature coefficient

Abstract

A voltage reference circuit fixable in temperature coefficient comprises a starting circuit, a positive temperature coefficient current generating circuit, a negative temperature coefficient current generating circuit, a zero temperature coefficient current generating circuit, a zero temperature coefficient current regulating circuit and a fixed temperature coefficient voltage synthesis circuit. Image current of the positive temperature coefficient current generating circuit and the negative temperature coefficient current generating circuit is output to the zero temperature coefficient current regulating circuit and the fixed temperature coefficient voltage synthesis circuit, the zero temperature coefficient current regulating circuit provides image current for the fixed temperature coefficient voltage synthesis circuit, and the reference voltage end of the fixed temperature coefficient voltage synthesis circuit outputs stable reference voltage. The voltage reference circuit fixable in temperature coefficient fully utilizes the high-matching characteristic of an integrated circuit to enable the reference voltage temperature coefficient to be unrelated with the temperature characteristics of a resistor and an MOS transistor, achieves the fixed temperature characteristic of a reference voltage source and calibrates the reference voltage to enable the temperature coefficient of the reference voltage not to be influenced.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a voltage reference circuit with a fixed temperature coefficient. Background technique [0002] The voltage reference is a module commonly used in the circuit. It provides a reference voltage for the system. It is extremely important in digital-to-analog converters, oscillators, delayers, some analog-to-digital converters, signal transceivers, and power supply stabilization modules. . An accurate reference voltage source is especially important in precise signal processing or high stable voltage modules. Since most device characteristics vary with temperature, some circuits require the reference voltage to have a certain temperature coefficient for compensation. [0003] Ordinary voltage reference sources will have different reference voltages due to process deviations, which can be corrected by digital methods, but it is difficult to achieve in analog chips; or use electri...

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Problems solved by technology

[0003] Ordinary voltage reference sources will have different reference voltages due to process deviations, which can be corrected by digital methods, but it is difficult to achieve in

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