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A closed-loop curvature compensation CMOS band-gap reference voltage source

A reference voltage source, curvature compensation technology, applied in the direction of regulating electrical variables, instruments, control/regulating systems, etc., can solve the problem of insufficient temperature stability, achieve high practical value, improve temperature stability, and reduce process requirements. Effect

Inactive Publication Date: 2009-09-16
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0019] In order to solve the problem that the temperature stability of the reference voltage of the bandgap reference voltage source is not high enough in an actual working environment, the present invention provides a closed-loop curvature compensation CMOS bandgap reference voltage source, and the reference voltage source includes:

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  • A closed-loop curvature compensation CMOS band-gap reference voltage source
  • A closed-loop curvature compensation CMOS band-gap reference voltage source
  • A closed-loop curvature compensation CMOS band-gap reference voltage source

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Embodiment Construction

[0040] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0041] see figure 2 , the embodiment of the present invention provides a closed-loop curvature compensation CMOS bandgap reference voltage source, the voltage source is based on the existing first-order temperature compensation bandgap reference voltage source circuit, using the current I PTAT Generate current I CTAT , while using the output reference voltage Vref to feed back to generate a closed-loop compensation current I CL . Current I CL The accuracy depends on the stability of the reference voltage Vref; the higher the stability of the reference voltage Vref, the current I CL The higher the accuracy, the higher the stability of the output reference voltage Vref, which forms a positive feedback. Therefore, it is possible to c...

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Abstract

The invention discloses a closed-loop curvature compensation CMOS band-gap reference voltage source, belonging to the field of power and microelectronics technology. The reference voltage source includes: a CTAT current generation circuit, for generating PTAT current (I [PTAT]); a closed-loop compensation current generating circuit, for generating closed-loop compensation current (I [CL]); a voltage generating circuit in reference to the generated closed-loop compensation current (I [CL]), for generating a reference voltage source (Vref), wherein, the PTAT current generation circuit is connected to the CTAT current generating circuit, the CTAT current generation circuit is connected to the closed-loop compensation current generating circuit, the reference voltage generation circuit is connected to the CTAT current generation circuit and the closed-loop compensation current generating circuit. The closed-loop curvature compensation CMOS band-gap reference voltage source structure provided by the invention can effectively improve the accuracy of compensation current, thereby increasing the temperature stability of the output reference voltage.

Description

technical field [0001] The invention relates to the technical fields of power supply and microelectronics, in particular to a closed-loop curvature compensation CMOS bandgap reference voltage source. Background technique [0002] Generally speaking, there are certain fluctuations in the supply voltage introduced from the outside of the chip, and high-precision analog circuits have high requirements for the stability of the bias voltage. Therefore, in analog circuits, we generally use a reference voltage source, which It can convert the power supply voltage into a voltage with good voltage stability and temperature stability, and provide a good reference voltage for other parts of the circuit. [0003] A reference voltage source usually refers to an accurate and stable voltage source used as a voltage reference in a circuit. With the continuous increase of the scale of integrated circuits, especially the development of system integration technology, the reference voltage sou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/30
Inventor 范涛袁国顺
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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