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Low-voltage, high-accuracy current mirror circuit

A current mirror and circuit technology, applied in the direction of adjusting electrical variables, instruments, control/regulating systems, etc., can solve problems such as expensive connections and achieve low cost effects

Active Publication Date: 2014-08-13
NVIDIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such connections are also expensive in terms of the silicon area

Method used

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  • Low-voltage, high-accuracy current mirror circuit
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  • Low-voltage, high-accuracy current mirror circuit

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Embodiment Construction

[0012] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.

[0013] System Overview

[0014] figure 1 is a block diagram illustrating a computer system 100 configured to implement one or more aspects of the present invention. Computer system 100 includes a central processing unit (CPU) 102 and system memory 104 including device drivers 103 . CPU 102 and system memory 104 communicate via an interconnect path that may include memory bridge 105 . The memory bridge 105 may be, for example, a north bridge chip, connected to an input / output (I / O) bridge 107 via a bus or other communication path 106 (eg, a HyperTransport link). I / O br...

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PUM

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Abstract

An approach is provided for a low-voltage, high-accuracy current mirror circuit. In one example, a current mirror circuit includes an input circuit configured to receive an input reference current. The input circuit includes a feedback channel for comparing and substantially matching the input reference current with an output current. The feedback channel is not configured for matching an input voltage with an output voltage. The input circuit does not include a comparator having an operational amplifier to compare the input reference current with the output current. The current mirror circuit also includes an output circuit coupled to the input circuit. The output circuit is configured to send the output current to one or more components of a circuit block.

Description

technical field [0001] This invention relates generally to integrated circuits and, more particularly, to low voltage, high precision current mirror circuit designs. Background technique [0002] Integrated circuits typically include components (eg, buffers, amplifiers, flip-flops, etc.) that operate based on a bandgap voltage reference. A bandgap voltage reference is a temperature-independent voltage reference circuit widely used in integrated circuits. There can be hundreds of components operating on one bandgap voltage reference within a given circuit because bandgap circuits require significant silicon area. Typically, each component receives information of the bandgap voltage reference over a long distance (eg 2mm). If voltages are used to convey such information over long distances, it is difficult to ensure that the bandgap voltage is measured and converted to current at the same ground potential. Further, such voltage-to-current conversion is expensive in terms of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/10G05F1/561G05F3/26
Inventor 西芳典
Owner NVIDIA CORP