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Bandgap circuit

A circuit and core circuit technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as increasing the area occupied by circuits

Inactive Publication Date: 2013-02-06
MEDIATEK SINGAPORE PTE LTD SINGAPORE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] An embodiment of the present invention provides a bandgap circuit to solve the above-mentioned problem of reducing noise at the cost of increasing the occupied area of ​​the circuit

Method used

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Embodiment Construction

[0015] Certain terms are used throughout the description to refer to particular elements. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. In this specification, the difference in names is not used as a way to distinguish components, but the difference in function of components is used as a criterion for distinguishing. "Includes" mentioned throughout the specification is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" here includes any direct and indirect means of electrical connection. Therefore, if it is described in the text that a first device is coupled to a second device, it means that the first device can be directly electrically connected to the second device. second device, or indirectly electrically connected to the second device through other devices or connection means.

[0016] figure 1 It is a schematic structural di...

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Abstract

The invention provides a bandgap circuit for providing stable reference voltages. The bandgap circuit comprises a core circuit and an output branch. The core circuit comprises: a first transistor, coupled between a supplied working voltage and a first node, and having a gate coupled to the first node; a second transistor, coupled between the supplied working voltage and a second node, and having a gate coupled to the first node; a third transistor, coupled between the first node and a ground voltage, and having a gate coupled to a third node; a fourth transistor, coupled between the third node and the ground voltage, and having a gate coupled to the second node; and a first resistor, coupled between the second and third nodes. The output branch is coupled to the core circuit to receive an output of the core circuit, and arranged to output a reference voltage at an output node. The bandgap circuit has a good noise-removing function without increase in the area of the circuit.

Description

technical field [0001] The present invention relates to a bandgap circuit, in particular to a bandgap circuit that can provide a stable reference voltage. Background technique [0002] Bandgap circuits are widely used in power supply circuits, which can generate stable current or voltage without being affected by fluctuations in power supply voltage and temperature. Therefore, in a semiconductor device, a bandgap circuit can be used to generate a reference voltage. [0003] In a conventional bandgap circuit, unless the area occupied by the circuit is increased, it will be difficult to effectively reduce noise. In view of this, there is a need for a brand-new bandgap circuit that can be designed with a small area and has good anti-noise performance. Contents of the invention [0004] An embodiment of the present invention provides a bandgap circuit to solve the above-mentioned problem of reducing noise at the cost of increasing the occupied area of ​​the circuit. [0005...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F3/30
Inventor 黄健忠
Owner MEDIATEK SINGAPORE PTE LTD SINGAPORE
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