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Reference voltage generator

一种参考电压、产生器的技术，应用在仪器、调节电变量、控制/调节系统等方向，能够解决运算放大器耗电、大IC面积等问题

Inactive Publication Date: 2010-06-23
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, op amps are not only very power hungry, but also require considerable IC area to implement

Method used

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Experimental program
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Embodiment Construction

[0018] figure 1 A circuit diagram of a reference voltage generator according to an embodiment of the invention is shown. Please refer to figure 1 . The reference voltage generator 100 includes a bandgap reference circuit 110 , a level shift circuit 120 and a voltage divider 130 . The bandgap reference circuit 110 includes a current generator 111 and a BJT 112 . The current generator 111 outputs a reference current Ir. The reference current Ir flows into the emitter of the transistor 112 through the resistor 113 . Both the base and the collector of the transistor 112 are grounded. The first bias voltage V1 is output at the emitter of the transistor 112 . The bandgap reference voltage Vr is output between the current generator 111 and the resistor 113 .

[0019] The level shift circuit 120 is coupled to the bandgap reference circuit 110 and used for generating a bias voltage V2 higher than the bias voltage V1 and not equal to the bandgap reference voltage Vr. The volta...

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Abstract

A reference voltage generator is provided. The reference voltage generator includes a bandgap reference circuit, a level shifter and a voltage divider. The bandgap reference circuit includes a current generator and a first BJT. The current generator outputs a reference current. The first BJT flows in the reference current from its emitter via a first resistor and has its collector and base grounded, such that a bandgap reference voltage and a first bias voltage can be output at the connection between the current generator and the first resistor and at the emitter of the first BJT. The level shifter is coupled to the bandgap reference circuit and outputs a second bias voltage higher than the first bias voltage and unequal to the bandgap reference voltage. The voltage divider is connected between the second bias voltage and the bandgap reference voltage and outputs a reference voltage therebetween.

Description

technical field [0001] The present invention relates to a reference voltage generator, and in particular to a reference voltage generator with power saving function. Background technique [0002] A conventional reference voltage generator uses a bandgap reference circuit to generate a bandgap reference voltage proportional to absolute temperature (PTAT). Due to the characteristics of the bandgap reference circuit, the range of the bandgap reference voltage is limited. When a higher reference voltage is required, the bandgap reference voltage is output through an additional operational amplifier. A resistor string then generates a higher reference voltage according to the output bandgap reference voltage. However, operational amplifiers are not only very power hungry, but also require considerable IC area to implement. Contents of the invention [0003] The invention relates to a reference voltage generator. The reference voltage generator can output a reference volt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56G05F3/22
CPCG05F3/242
Inventor 王惠民
Owner HIMAX TECH LTD