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High-order temperature compensating current reference source

A technology of high-order temperature compensation and current reference source, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., to achieve the effect of good temperature characteristics and simple circuit structure

Active Publication Date: 2011-03-30
ARKMICRO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned problems in terms of circuit complexity and temperature characteristics, the present invention proposes a high-order temperature-compensated current reference source circuit, which includes a start-up circuit, an IPTAT current source, and a reference current output unit; wherein , the starting circuit is used as the starting circuit of the IPTAT current source, and the reference current obtained by the IPTAT current source is output through the reference current output unit

Method used

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Embodiment Construction

[0018] The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] as attached image 3 Shown is a schematic structural diagram of the high-order temperature compensation current reference source described in the specific embodiment of the present invention, the reference source includes a start-up circuit 101, an IPTAT current source 100 and a reference current output unit 102; wherein the start-up circuit 101 serves as the IPTAT current source 100 The starting circuit is used to start the circuit to prevent the circuit from being locked in the position of zero voltage. The IPTAT current source 100 obtains the IPTAT current with better temperature characteristics, and outputs the high voltage described in the specific embodiment of the present invention through the reference current output unit 102. step temperature compensated reference current.

[0020] like Figure 4 Shown is a high...

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Abstract

The invention discloses a high-order temperature compensating current reference source. The current reference source comprises a start-up circuit, an inversely proportional to absolute temperature (IPTAT) current source and a reference current output unit, wherein the start-up circuit serves as the start-up circuit of the IPTAT current source; and reference current obtained by the IPTAT current source is output through the reference current output unit. The current reference source of the invention has a simple circuit structure, and the output reference current is hardly influenced by temperature.

Description

technical field [0001] The invention relates to the technical field of power supplies in integrated circuits, in particular to the technical field of reference power supplies. Background technique [0002] The function of the current reference source is to provide reference currents to other functional modules in the circuit. It is a very important functional module in analog integrated circuits. It often provides reference currents for oscillators, filters, digital-to-analog conversion and precise time delay modules. For current, there is no loss when transmitting on long metal lines, but there is loss when transmitting voltage, so in analog circuits with long interconnecting metal lines, current reference sources are more preferred. In addition, if the circuit uses current mode, it will work at a higher frequency than voltage mode, increasing the speed of the circuit. However, the accuracy and stability of a current-mode circuit over a wide temperature range is directly d...

Claims

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Application Information

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IPC IPC(8): G05F3/24G05F3/26
Inventor 方尚侠刘敬波胡江鸣刘俊秀石岭
Owner ARKMICRO TECH
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