Startup circuit and startup method for bandgap voltage generator

A technology for voltage generation circuits and start-up circuits, which can be used in power lines, regulation of electrical variables, instruments, etc., and can solve problems such as limiting operational efficiency

Active Publication Date: 2007-07-25
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the existing start-up circuit 110 cannot be applied more flexibly with the design change of the bandgap voltage generating circuit 100, thereby limiting the overall operating performance.

Method used

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  • Startup circuit and startup method for bandgap voltage generator
  • Startup circuit and startup method for bandgap voltage generator
  • Startup circuit and startup method for bandgap voltage generator

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Embodiment Construction

[0020] Certain terms are used in the description and claims to refer to particular components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. In addition, the term "coupled" here includes any direct and indirect means of electrical connection. The delta-sigma modulator and its data conversion method according to preferred embodiments of the present invention will be described below with reference to related drawings. For ease of understanding, the same components in the following embodiments are described with the same symbols.

[0021] FIG. 2 is a schematic circuit diagram of a start-up circuit 210 according to an embodiment of the present invention. The start-up circuit 210 includes a switch circuit 220 , a start-u...

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PUM

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Abstract

The present invention discloses a startup circuit. The startup circuit is utilized for activating a bandgap voltage generator, wherein the bandgap voltage generator includes a first terminal for providing a first voltage level and a second terminal for providing a second voltage level. The startup circuit includes a switching circuit, an activating circuit, and a controlling circuit. The switching circuit is coupled to the bandgap voltage generator; the activating circuit is coupled to the switching circuit for conducting the switching circuit to activate the bandgap voltage generator; and the controlling circuit is coupled to the switching circuit for monitoring the variation of the first voltage level and the second voltage level to control the conductivity of the switching circuit.

Description

technical field [0001] The invention relates to an energy gap voltage generating circuit, in particular to a starting circuit and a starting method applied to the energy gap voltage generating circuit. Background technique [0002] Generally, a bandgap voltage generator is used to generate a precise voltage, which must be resistant to temperature variation. In order to enable the bandgap voltage generating circuit to operate, a startup circuit is usually used to start the bandgap voltage generating circuit to generate the bandgap voltage, and after the bandgap voltage is generated, the startup circuit can automatically shuts down to reduce overall power consumption. [0003] FIG. 1 is a schematic circuit diagram of a conventional start-up circuit 110 . The starting circuit 110 is applied to a bandgap voltage generating circuit 100 . If the current start-up circuit 110 turns on or turns off at the wrong time, the bandgap voltage generating circuit 100 will not work normall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/16G05F3/26
CPCG05F3/30G05F3/267Y10S323/901
Inventor 张文华
Owner REALTEK SEMICON CORP
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