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Current generating circuit and reference voltage circuit using it

A current generation circuit and current technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as insufficient use

Active Publication Date: 2011-12-28
ROHM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The BGR circuit described in Patent Document 1 can generate a stable reference voltage Vref with respect to power supply voltage and temperature, but the temperature coefficient δVref / δT is not completely zero, which may be insufficient depending on the application

Method used

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  • Current generating circuit and reference voltage circuit using it
  • Current generating circuit and reference voltage circuit using it
  • Current generating circuit and reference voltage circuit using it

Examples

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Embodiment Construction

[0045] Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. The same or equivalent structural elements, members, and processes shown in the respective drawings are assigned the same reference numerals, and correspondingly repeated descriptions are omitted. In addition, the embodiment is not to limit the invention but to illustrate, and all the features described in the embodiment or combinations thereof are not necessarily essential features or combinations of the invention.

[0046] In this specification, the so-called "state where member A and member B are connected" includes not only the case where member A and member B are physically and directly connected, but also other members through which member A and member B do not affect the electrical connection state. The case of indirect connection.

[0047] Similarly, "a state in which member C is installed between member A and member B" includes, in addition to th...

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Abstract

A first current source generates a first current having positive temperature characteristics. A second current source generates a second current. A first current mirror circuit generates a third current by multiplying, by a first coefficient, the base current of a compensation transistor configured as an NPN bipolar transistor arranged on a path of the second current. A second current mirror circuit generates a fourth current that is proportional to the difference between the first current and the third current. A current generating circuit outputs the sum total of the fourth current and a fifth current that is proportional to the base current.

Description

technical field [0001] The present invention relates to current generating circuits. Background technique [0002] In semiconductor integrated circuits, a band gap reference voltage circuit (also called a band gap reference (BGR) circuit (band gap reference circuit)) is used for the purpose of generating a constant voltage regardless of power supply voltage fluctuations or temperature fluctuations. Patent Document 1 discloses an example of a BGR circuit. [0003] The BGR circuit described in Patent Document 1 can generate a stable reference voltage Vref with respect to power supply voltage and temperature, but the temperature coefficient δVref / δT is not completely zero, which may be insufficient depending on the application. [0004] [Prior art literature] [0005] [Patent Document] [0006] [Patent Document 1] JP-A-5-088767 [0007] [Non-Patent Document 1] PAUL R.GRAY, PAUL J.HURST, STEPHEN H.LEWIS, ROBERT G.MEYER, ANALYSIS AND DESING OF ANALOG INTEGRATED CIRCUIT 4th Ed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/26
CPCG05F3/30G05F3/26G05F3/225G05F3/267
Inventor 菊池弘基
Owner ROHM CO LTD
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