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Band-gap reference voltage source compensated by using high-order curvature

A reference voltage source, order curvature technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of increasing circuit complexity and power consumption, and achieve improved stability, simple control structure, and the number of compensation components. less effect

Inactive Publication Date: 2011-04-13
TIANJIN VAST TECH
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Problems solved by technology

However, this solution has the following disadvantages compared with the present invention. The operational amplifier circuit is used in the circuit to increase the complexity and power consumption of the circuit, and the impact of the input offset of the operational amplifier on the output reference voltage will be more obvious. At the same time, the compensation circuit to generate the I PTAT Compensation by two branches

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  • Band-gap reference voltage source compensated by using high-order curvature
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  • Band-gap reference voltage source compensated by using high-order curvature

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with accompanying drawings and examples.

[0032] The technical solution of the present invention to solve the problem is: the bandgap reference voltage of the high-order curvature compensation proposed by the present invention is as follows: figure 2 shown. It is based on the traditional first-order bandgap reference, adding some circuits to obtain an output reference voltage with more excellent temperature characteristics. figure 2 Medium current I a , I b respectively by working in the linear region M NS and work in the subthreshold and saturation region M PI tube produced.

[0033] NMOS tube M NS The role is to extract the flow through the resistor R 4 the I PTAT current, while the PMOS tube M PI The role is to give the resistor R 4 Inject positive temperature coefficient current. m NS The shunting effect of the tube is through the resistor R 2 , R 3 , R 4 jointly controlled. m P...

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Abstract

The invention relates to the field of nonlinear compensation of band-gap reference, which is characterized in that: two branch circuit currents are added according to a principle of nonlinear subsection compensation; the currents are extracted and introduced into divider resistances of a reference output branch circuit according to an internal temperature negative feedback structure of the output branch circuit; and the temperature characteristics of an output reference voltage source are changed according to the influence of temperature coefficients of current extraction and introducing on output voltages in different temperature ranges to ensure that the output reference voltages repeatedly reach local extreme points in the whole working temperature range. The output voltage reference first derivatives with respect to the temperatures at the points are zero, so that the aim of subsection compensation is fulfilled, and the temperature coefficients of the output reference voltage source are effectively reduced.

Description

technical field [0001] The invention designs a bandgap reference voltage source circuit with a low temperature coefficient, and in particular relates to a bandgap reference voltage source for high-order curvature compensation. Background technique [0002] The reference voltage source is a very important module in an analog integrated circuit. An effective reference voltage source is basically independent of power supply voltage changes, process parameter changes, temperature changes, etc. within a certain range. Since the Widlar reference voltage source was introduced, the bandgap voltage source technique has been widely used in bipolar integrated circuits. With the design of some new circuits and technological innovations, such as temperature compensation, laser correction and other technologies, the performance of the bandgap reference voltage source has been continuously improved; with the rapid development of CMOS technology today, the bandgap reference voltage source t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/30
Inventor 李景虎马杰喻明艳
Owner TIANJIN VAST TECH
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