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Reference current source

A reference current source, current source technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of high power consumption and low precision, and achieve the effect of low power consumption

Active Publication Date: 2013-12-04
四川电子科技大学教育发展基金会
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0024] In order to solve the problems of low precision and excessive power consumption of existing reference current sources, the present invention proposes a reference current source

Method used

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Embodiment Construction

[0043] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0044] Such as Figure 5 As shown, the reference current source of the present invention includes: a current source core circuit, a current bias circuit, an offset voltage circuit and an output stage unit, wherein the first input and output terminals 1 and the second input and output terminals of the current source core circuit 2. The third input and output terminal 3 is respectively connected to the first input and output terminal 1, the second input and output terminal 2, and the third input and output terminal 3 of the current bias circuit, and the fourth terminal 4 of the current source core circuit is connected to the outside The first terminal VDD- of the power supply voltage, the fourth terminal 4+ of the current bias circuit is connected to the second terminal VDD+ of the external power supply voltage; the output stage is connected wit...

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Abstract

The invention discloses a reference current source comprising a current source core circuit, a current bias circuit, an offset voltage circuit and an output stage unit. The reference current source is characterized in that a fifth end and a sixth end of the current source core circuit are respectively connected to a first relative voltage and second relative voltage outside, and the difference between the first relative voltage and the second relative voltage serves as offset voltage which maintains constantly while the temperature changes and which is reserved to carrier mobility along the process changing tendency. According to the reference current source, the temperature coefficient of the voltage of two end of an MOS (metal oxide semiconductor) resistor can be changed by guiding in the offset voltage in the current source core circuit and can compensate mutually with that of the carrier mobility, and output current with zero temperature coefficient can be realized. The reference current source further has the advantages of process compensation, and influences on current source accuracy by process variations can be reduced.

Description

technical field [0001] The invention belongs to the field of analog integrated circuit design, in particular to the design of a reference current source. Background technique [0002] The reference current source is an important module circuit in an integrated circuit. It provides a stable static operating point for other functional modules. It is widely used in amplifiers, oscillators, comparators, phase-locked loops, ADC / DAC and other circuits. The current source The accuracy of the function largely determines the stability of the function module. [0003] Power supply voltage, temperature variation and process deviation are important factors affecting the accuracy of the reference current source. A well-designed reference current source should have a stable output current with the power supply voltage, temperature change and process deviation. The output current of the reference current source can be Represented by the following model: [0004] I=f(V,T,P) [0005] Amon...

Claims

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Application Information

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IPC IPC(8): G05F3/30
Inventor 文光俊刘佳欣王耀张涛
Owner 四川电子科技大学教育发展基金会
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