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High-precision complementary current source circuit

A current source, high-precision technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of obvious channel modulation, inappropriate high power supply voltage, etc., to achieve the effect of increasing current mode control

Active Publication Date: 2019-01-25
NORTH ELECTRON RES INST ANHUI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Invention patent CN105739586A "A Current Reference Source Circuit" realizes a method for generating a reference current source, but it is obviously modulated by the channel and is not suitable for higher power supply voltages

Method used

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  • High-precision complementary current source circuit
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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0026] like figure 2 and image 3 As shown, the circuit of the present invention includes operational amplifiers referred to as operational amplifiers OP1, OP2, MOS tubes M0, M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11, M12, M13, M14, M15 , M16, M17, M18, M19, M20 and capacitor Cc.

[0027] The input reference voltage VREF is input to the gate of MOS transistor M1, the sources of MOS transistors M1 and M2 are connected to the drain of MOS transistor M9, the drain of MOS transistor M1 is connected to the source of MOS transistor M0, and the drain of MOS transistor M3 The drain of the MOS transistor M0 is connected to the gate of the MOS transistor M2, the drain of the MOS transistor M11, and...

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Abstract

The invention discloses a high-precision complementary current source circuit. Based on a standard CMOS (complementary metal-oxide-semiconductor) process, the same current source serves as draw-off current and sink current mirror image sources, an operational amplifier clamp is introduced to reduce mirror image errors, the matching degree of draw-off current and sink current is further increased,and high impedance of the current source is realized. according to the circuit, the draw-off current and the sink current can be completely matched without subsequent resistor trimming, current mode control is added, an independent sink current mode or an independent draw-off current mode or the two modes can be selected to realize the complementary current source.

Description

technical field [0001] The invention relates to a high-precision complementary current source generation technology, which belongs to the analog integrated circuit technology. Background technique [0002] In analog integrated circuit applications, high precision complementary current sources are usually required, such as figure 1 As shown, that is, the sinking current and the sourcing current are required to be strictly equal. [0003] However, the current integrated circuit technology generally uses thin-film or polysilicon resistance trimming to realize a fully complementary current source, but this undoubtedly increases the cost and complexity of use. [0004] The paper "Baseline Current Source Design Using Segmented Linear Compensation" records a low-temperature drift current source circuit. Although the temperature coefficient is low, it only has a method of generating current. The paper "High Performance CMOS Bandgap Reference Source with Multiple VI Outputs" record...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/26
CPCG05F3/262Y02B70/10
Inventor 李秋利白涛戴放简云飞
Owner NORTH ELECTRON RES INST ANHUI CO LTD