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Low temperature coefficient bandgap voltage reference circuit

A technology with low temperature coefficient and voltage reference, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve problems such as difficulty in temperature coefficient, and achieve the effect of reducing temperature coefficient, reducing cost, and high compensation stability

Active Publication Date: 2012-08-01
HI TREND TECH SHANGHAI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the independence of the reference voltage from temperature directly depends on the complexity of the circuit, that is, the number of sampling circuits. Therefore, it is difficult to obtain an extremely low temperature coefficient under the condition of limited complexity.

Method used

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  • Low temperature coefficient bandgap voltage reference circuit
  • Low temperature coefficient bandgap voltage reference circuit
  • Low temperature coefficient bandgap voltage reference circuit

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Embodiment Construction

[0027] In the following description, many technical details are proposed in order to enable readers to better understand the application. However, those skilled in the art can understand that without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.

[0029] The first embodiment of the present invention relates to a low temperature coefficient bandgap voltage reference circuit. figure 1 It is a structural schematic diagram of the low temperature coefficient bandgap voltage reference circuit.

[0030] The difference between the bottom of the conduction band and the top of the valence band of a ...

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Abstract

The invention relates to the field of design of an integrated circuit and discloses a low temperature coefficient bandgap voltage reference circuit. In the circuit, a temperature compensation circuit is introduced to perform feedback correction on a temperature coefficient of output reference voltage based on the traditional current mode bandgap reference circuit structure, and due to a nonlinear temperature coefficient compensation mode, the temperature coefficient of the output reference voltage can be greatly reduced, and the reference circuit has high compensation stability and slight influence on initial accuracy of the preference voltage. By a nonlinear temperature sensing unit, the base-emitter (BE) junction voltage of a crystal triode is subjected to temperature detection, and a nonlinear current is generated and is superposed with two circuits with opposite temperature coefficients in the reference circuit, so that zero temperature coefficient reference voltage which is hardly related to the temperature is generated.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a low temperature coefficient bandgap voltage reference source circuit with temperature compensation. Background technique [0002] The difference between the bottom of the conduction band and the top of the valence band of a semiconductor is the band gap (Bandgap), and the band gap voltage reference (Bandgap voltage reference) uses a voltage proportional to temperature and the sum of the diode voltage drop, and the temperature coefficients of the two cancel each other out. Implements a temperature-independent voltage reference. Because this reference voltage is close to the bandgap voltage of silicon, it is called a bandgap reference. [0003] The bandgap voltage reference circuit is widely used in analog integrated circuits. Its main function is to provide stable reference voltage or current for other units in the system. Especially in the design of precision circuit s...

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Application Information

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IPC IPC(8): G05F1/567
Inventor 王永寿萧经华郎君佘龙
Owner HI TREND TECH SHANGHAI
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