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A circuit for generating multiple current references

A technology of current reference and voltage reference, which is applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., and can solve the problems of high cost and many operational amplifiers or compensation capacitors.

Active Publication Date: 2015-11-11
SHANGRUI MICROELECTRONICS SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This method has the disadvantage of using an operational amplifier or too many compensation capacitors and high cost

Method used

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  • A circuit for generating multiple current references
  • A circuit for generating multiple current references
  • A circuit for generating multiple current references

Examples

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Embodiment Construction

[0020] The embodiment of the present invention is illustrated below by specific examples, please refer to Figure 3 to Figure 4 . Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various modifications or changes may be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0021] An example of the present invention is image 3 shown. This example is for figure 1 The current detector, current mirror, and current reference output are specifically refined. It includes a first current reference generator (1), a second current reference generator (2), and an output current reference (3). The voltage reference Vref is connected to an input terminal of the operational amplifier Amp...

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PUM

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Abstract

The invention discloses a circuit capable of generating multiple current references, wherein a reference voltage and a first resistor form a first current reference through a first feedback loop; an image of the first current reference is made, and an image current flows through a second resistor; the current of the second resistor is compensated through a second feedback loop, so as to enable the voltage of the second resistor to be equal to the reference voltage; the compensating current can serve as a second current reference. The first current reference and the second current reference can be summed, so as to obtain the current reference which is only related to the reference voltage and the second resistor.

Description

technical field [0001] The invention relates to a semiconductor integrated circuit, in particular to a new circuit for generating multiple current references based on a reference voltage and multiple resistors. Background technique [0002] Many applications in analog circuits require a current or voltage reference. A voltage reference is typically generated using a bandgap reference voltage, and a current reference is typically generated by means of a reference voltage and a resistor. Different applications have different requirements for current references, such as value size, temperature coefficient, accuracy, and so on. This requires the use of resistors with different sizes, or resistors with different temperature coefficients and accuracy. [0003] A common method for generating different current references is to use an operational amplifier for each current reference to obtain the required current through a feedback loop, and each feedback loop has a corresponding s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/26
Inventor 马军
Owner SHANGRUI MICROELECTRONICS SHANGHAI