Bandgap reference source with multiple point curvature compensation

Abstract

This invention belongs to band gap basic power field, which is characterized by adding two current branches on current power and dividing two triodes integration injection current and fetch current to change their temperature properties and to change output basic voltage temperature property to achieve three basic voltage local maximum points in whole work range to make the output voltage basic temperature first degree derivative as zero.

Description

technical field [0001] The technical field of direct application of the "bandgap reference voltage source for multi-point curvature compensation" is the occasion with higher precision requirements for the reference voltage. The proposed circuit is a class of bandgap voltage references that can provide lower temperature coefficient reference voltages. Background technique [0002] The reference voltage source (Voltage Reference) usually refers to an accurate and stable voltage source used as a voltage reference in the circuit. With the continuous increase of the scale of integrated circuits, especially the development of system integration technology (SOC), the reference voltage source has become an indispensable basic circuit module in large-scale, VLSI and almost all digital and analog systems. [0003] Precision and stable voltage references are required in a large number of integrated circuits and circuit units, such as digital-to-analog converters (DACs), analog-to-digi...

AI Technical Summary

Problems solved by technology

It can be seen that the essence of these methods is to control the triode emitter junction voltage V BE (T) A certain reference temperature point T in the entire temperature range r The high-order items of the Taylor expansion are compensated, and they often have the disadvantages of complex circuits, large occupied areas, and increased manufacturing processes to varying degrees.

In the article published by Wu Guoping in 2005 (see literature Wu Guoping, Huang Nianya, Liu Guizhi, Research on a Second-Order Curvature Compensation Bandgap Benchmark, Electronic Devices, Volume 28, Issue 3, 2005), a new The second-order curvature compensation circuit (see Figure 3), but he failed to elaborate on the working principle of the circuit theoretically, and failed to discover the essential characteristics of the circuit, and this circuit only provides one branch current, so the compensation effect not as good as the invention

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