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

Active Publication Date: 2017-01-11
成都启臣微电子股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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, it will cause signal duty cycle distortion, or even signal frame loss, resulting in logic errors

Method used

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

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Embodiment 1

[0036] Such as figure 1 The shown positive and negative voltage dynamic bias level shift circuit based on negative voltage detection and bandgap reference includes a power supply voltage detector 101, an adaptive bias circuit 102 and a level shift circuit 103, wherein,

[0037] The power supply voltage detector 101 detects the negative power supply voltage VS- and the positive power supply voltage VS+ of the chip, and compares the negative power supply voltage VS-, the positive power supply voltage VS+ with the ground level GND respectively. Output a negative power supply voltage signal when the power supply voltage reaches the threshold;

[0038] The adaptive bias circuit 102 adaptively adjusts the bias current according to the negative power supply voltage signal and the power supply voltage;

[0039] The level shift circuit 103 performs level shift on the driving signal according to the positive power supply voltage VS+, the negative power supply voltage signal and the bia...

Embodiment 2

[0042] The level shift circuit of the present invention adopts dynamic self-adaptive bias adjustment technology, the positive and negative power supply voltage is detected by the power supply voltage detector and compared with the common ground voltage to obtain the power supply voltage state signal, when the positive power supply voltage reaches the set normal voltage value or more And when the negative voltage is lower than the threshold, a negative power supply voltage signal is output, wherein the normal value of the positive power supply voltage is generally set to 5V, and the negative voltage is lower than the threshold -2V, that is, a negative power supply voltage status signal is output. This embodiment refines each circuit on the basis of Embodiment 1, specifically, the power supply voltage detector includes a positive power supply voltage comparator 201, a negative power supply voltage comparator 202, a trigger latch 204 and a signal amplifier 203 , wherein, the posit...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175
CPCH03K19/017509
Inventor 黄家荣代成志何兵赵波许刚颖
Owner 成都启臣微电子股份有限公司
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