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Low-offset bandgap circuit and corrector

An offset band and circuit technology, applied in amplifiers, instruments, amplifiers with semiconductor devices/discharge tubes, etc., can solve problems such as instability, improve stability and reduce output fluctuations

Active Publication Date: 2014-07-23
VIA TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in reality, the output potential of the bandgap circuit is often negatively affected by the offset (Offset) of the operational amplifier (Operational Amplifier, OP), so it is far more unstable than the ideal state.

Method used

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  • Low-offset bandgap circuit and corrector

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Embodiment Construction

[0015] In order to make the purpose, features and advantages of the present invention more comprehensible, specific embodiments of the present invention are listed below, together with the attached drawings, for detailed description as follows.

[0016] figure 1 It is a schematic diagram showing a low-offset bandgap circuit (Low-offset Bandgap Circuit) 100 according to an embodiment of the present invention. Such as figure 1 As shown, the low-skew bandgap circuit 100 includes a core bandgap circuit 110 and an offset cancellation circuit 120 . The core bandgap circuit 110 is coupled to a working potential (not shown), and outputs an output potential VOUT (eg, 1.2V) at the bandgap output node NBO. The core bandgap circuit 110 includes at least one core operational amplifier (Operational Amplifier, OP) 115 . To simplify the drawing, the remaining elements of the core bandgap circuit 110 are omitted and not shown in figure 1 displayed in . The core operational amplifier 115 h...

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PUM

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Abstract

A low-offset bandgap circuit and a corrector are disclosed. The low-offset bandgap circuit comprises a core bandgap circuit and an offset elimination circuit. The low-offset bandgap circuit provides a reference potential at an output node. The core bandgap circuit comprises a core computation amplifier to generate a core current. The offset elimination circuit is coupled to two input ends of the core computation amplifier. The offset elimination circuit generates a compensation current according to the potential of the input ends of the core computation amplifier, in order to compensate an offset potential of the core computation amplifier. The reference potential is generated according to the core current and the compensation current. With the low-offset bandgap circuit and the corrector, output fluctuation caused by offset of the computation amplifier can be reduced, and stability of the output potential of the core bandgap circuit can be improved effectively.

Description

technical field [0001] The present invention relates to a bandgap circuit (Bandgap Circuit), in particular to a low-offset bandgap circuit (Low-offset Bandgap Circuit) and an offset elimination circuit thereof. Background technique [0002] Bandgap circuits are widely used in the field of power supply circuits, which can generate stable reference potentials or reference currents without being affected by power supply potential fluctuations or temperature changes in semiconductor devices. [0003] However, in practice, the output potential of the bandgap circuit is often negatively affected by the offset of the operational amplifier (Operational Amplifier, OP), so it is far more unstable than the ideal state. In view of this, it is necessary to propose a new bandgap circuit design to reduce the output fluctuation caused by the offset of the operational amplifier. Contents of the invention [0004] In a preferred embodiment, the present invention provides a low-offset bandg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/46
CPCH03F3/45475H03F3/45982G05F3/30H03K5/003H03F2203/45212
Inventor 李永胜
Owner VIA TECH INC
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