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Controlled switch switching circuit and switching device

A controlled switch and circuit technology, applied in the electronic field, can solve the problems of NVDD circuit influence, overvoltage risk, etc., and achieve the effect of avoiding current backflow, improving work performance, and improving stability and safety.

Active Publication Date: 2021-11-26
GUANGZHOU HUIZHI MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the enable signal EN fails, the schematic diagram of the waveform of each node of the traditional controlled switch switching circuit in the negative pressure module is as follows: image 3 As shown, and this phenomenon will become more obvious as the load driven by VNEG becomes heavier. The current flowing back will raise the NVDD level, which will affect the NVDD generating circuit, and there is a risk of overvoltage. At the same time, NVDD is used in the entire system All circuit blocks are likely to be affected by elevated NVDD

Method used

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  • Controlled switch switching circuit and switching device
  • Controlled switch switching circuit and switching device
  • Controlled switch switching circuit and switching device

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Embodiment Construction

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings, and the described embodiments should not be considered as limiting the present invention, and those of ordinary skill in the art do not make any All other embodiments obtained under the premise of creative labor belong to the protection scope of the present invention.

[0023] In the following description, references to "some embodiments" describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or a different subset of all possible embodiments, and Can be combined with each other without conflict.

[0024] In the following description, the term "first\second\third" is only used to distinguish similar objects, and does not represent a specific ordering of objects. Understandably, "first\second\third" Where p...

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Abstract

The invention provides a controlled switch switching circuit and a switching device. The circuit comprises a first enable signal receiving end used for receiving a first enable signal of a negative voltage module; a control output end which is used for being connected with a controlled end of a controlled switch in the negative pressure module; a second control assembly which is used for outputting a first voltage when the first enable signal is enabled and outputting a second voltage when the first enable signal fails, the first voltage is a ground voltage, and the second voltage is gradually increased from a negative voltage value to the ground voltage, the difference value between the negative voltage value and the output voltage of the negative voltage module is smaller than a preset threshold value; a first control assembly which is used for outputting a first control signal to control the controlled switch to be switched off when the first enable signal is enabled and outputting a second control signal to control the controlled switch to be switched on when the first enable signal fails.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a controlled switching circuit and a switching device. Background technique [0002] Negative pressure is often used in integrated circuit systems. For example, switches in radio frequency front-ends need to use negative pressure to control the on-off of the switch. The structure of the negative pressure module in the related art can be as follows: figure 1 As shown, its working principle is that before the enable signal (EN) takes effect, the switches S1a and S2 are closed, and the switch S1b is opened. At this time, the capacitor C is precharged through the power supply NVDD, and the switches S1a, S1b and S2 are activated by the enable signal. EN control, when the enable signal EN takes effect, the switches S1a and S2 are turned off, and the switch S1b is turned on. When the switch S1b is closed, the positively charged capacitor VNEG_B is pulled to the ground level. Since...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/041H03K17/687
CPCH03K17/04106H03K17/687
Inventor 刘炽锋张鑫
Owner GUANGZHOU HUIZHI MICROELECTRONICS