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High-precision current source circuit with high power supply rejection ratio

A high power supply rejection ratio, high precision technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as increasing cost, increasing area, increasing chip area, etc., to reduce impact, improve rejection ratio, improve The effect of precision

Inactive Publication Date: 2014-08-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional method to alleviate this problem is to increase the channel length of the transistor and reduce the channel length modulation effect, but this will undoubtedly increase the chip area and increase the cost, especially in wide power supply voltage applications, the sharp increase in area is usually unacceptable

Method used

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  • High-precision current source circuit with high power supply rejection ratio
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  • High-precision current source circuit with high power supply rejection ratio

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Experimental program
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Embodiment Construction

[0015] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0016] The existing traditional PTAT current source generation circuit principle, such as figure 1 As shown, the left half is the PTAT current generation circuit, which uses the generation principle of the bandgap reference, which can be obtained:

[0017] V beQNA2 =V beQNA1 +I QNA1 × R A1

[0018] V T ln I QNA 2 I S = V T ln I QNA 1 AI S + I QNA 1 × R A 1 ...

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Abstract

The invention relates to a technology of an analog integrated circuit, and in particular relates to a high-precision current source circuit with the high power supply rejection ratio. The high-precision current source circuit with the high power supply rejection ratio is characterized by comprising a starting circuit, a temperature direct proportion current generating circuit, a power supply rejection ratio enhancing feedback circuit and a mirror image output circuit which are sequentially connected. The current source circuit disclosed by the invention has the beneficial effects that through a clamping principle and a feedback principle, the influence of a channel regulating effect on a current source is greatly reduced, and the rejection ratio of a mirror image current source module on power voltage change is increased; moreover, the precision of output mirror image current is enhanced, so that the output current is stable proportional-to-absolute temperature (PTAT) current which can not change along with other factors. The current source circuit disclosed by the invention is especially applicable to a current mirror current source circuit.

Description

technical field [0001] The invention relates to analog integrated circuit technology, in particular to a high-precision current mirror current source circuit with high power supply rejection ratio. Background technique [0002] The current mirror current source circuit is one of the most common and important integrated circuit modules in analog integrated circuit design. Its function is to generate a stable current source for other modules to ensure that the circuit performance of other modules will not change due to changes in the bias current source. It can be seen that how to ensure that the output current value of the current mirror current source is constant and does not vary with the input voltage is the key to the design of the current mirror current source circuit. [0003] The PTAT (Proportional to absolute temperature) current source is an important current source in the current mirror current source, that is, the size of the current source becomes larger as the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/46
Inventor 周泽坤董渊程洁张瑜石跃明鑫王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA