Positive and negative voltage dynamic bias level shifting circuit based on negative voltage detection and band-gap reference

A technology of negative pressure detection and displacement circuit, applied in the direction of logic circuit interface device, logic circuit connection/interface layout, etc., can solve problems such as signal distortion, signal frame loss, signal duty ratio distortion, etc., and achieve high reducibility effect
CN106330171AActive Publication Date: 2017-01-11成都启臣微电子股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
成都启臣微电子股份有限公司
Publication Date
2017-01-11

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Abstract

The invention discloses a positive and negative voltage dynamic bias level shifting circuit based on negative voltage detection and band-gap references, comprising a power supply voltage detector, an adaptive bias circuit and a level shifting circuit, wherein the power supply voltage detector is used for detecting the negative power supply voltage and positive power supply voltage of a chip, respectively comparing the negative power supply voltage and the positive power supply voltage with a ground level, and outputting a negative power supply voltage signal when the positive power supply voltage reaches a set value and the negative power supply voltage reaches a threshold; the adaptive bias circuit is used for adaptively adjusting bias current according to the negative power supply voltage signal and the power supply voltage; and the level shifting circuit is used for implementing level shifting on a driving signal according to the positive power supply voltage, the negative power supply voltage signal and the bias current to obtain a switch signal which cannot be changed with the power supply voltage and has fixed rising and falling edge delays. According to the positive and negative voltage dynamic bias level shifting circuit disclosed by the invention, the signal transmission distortion caused by power supply voltage changes even the negative voltage can be solved, and thus high reducibility of the signals in a level shifting process under high-speed signal transmission can be improved.
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Description

technical field

[0001] The invention relates to the field of level shifting circuits, in particular to a positive and negative voltage dynamic bias level shifting circuit based on negative pressure detection and bandgap reference. Background technique

[0002] The traditional level shifting circuit cannot automatically adjust according to the voltage. For an application that changes the power supply voltage or even negative voltage, the traditional level shifting circuit cannot adaptively adjust according to the power supply voltage, resulting in distortion of the rising / falling edge of the signal during the signal transmission displacement process. In high-speed signal transmission applications, the signal duty cycle will be distorted, and even signal frame loss will cause logic errors. Contents of the invention

[0003] The main purpose of the present invention is to provide a positive and negative voltage dynamic bias level shift circuit based on negative voltage detect...

Claims

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