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Power rail switching circuit

A technology for switching circuits and power rails, applied in the field of power rail switching circuits, which can solve the problems of logic risk and glitch risk, low anti-logic and glitch ability, etc., and achieve the effect of strong resistance to power rail glitches and strong anti-glitch ability

Pending Publication Date: 2020-03-27
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of low logic and glitch resistance and logic risk and glitch risk in the traditional method when the bounce or power supply noise is low, the present invention provides a power rail switching circuit

Method used

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Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with the embodiments and the accompanying drawings.

[0014] Such as figure 1 Shown is a schematic structural diagram of a power rail switching circuit provided by the present invention, including a digital unit and a positive feedback unit. The power rail switching circuit includes an input port of the input voltage VIN port and an output port of the output voltage VOUT port; in addition, the power rail switching circuit also includes a first power rail power supply voltage VDD1 port, a first power rail ground terminal GND1 port, The second power rail power supply voltage VDD2 port, the second power rail ground terminal GND2 port four power rail ports and the control voltage VA port and the control voltage VB port two internal signal ports.

[0015] Such as figure 2 As shown, the digital unit also includes a first NMOS transistor N1, a second NMOS transistor N2, a first PMOS transistor P1, and a ...

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PUM

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Abstract

A power rail switching circuit is characterized by comprising a digital unit and a positive feedback unit, wherein the digital unit comprises an input port connected with an input voltage VIN port, two power rail ports, namely a first power rail power voltage VDD1 port and a first power rail ground end GND1 port, and further comprises two output ports, namely a control voltage VA port and a control voltage VB port; the positive feedback unit comprises two input ports connected with the control voltage VA port and the control voltage VB port, and two power supply rail ports connected with a second power supply rail power supply voltage VDD2 port and a second power supply rail ground end GND2 port. Due to the fact that the positive feedback circuit is adopted, internal logic signals are further locked, the power rail switching function is achieved, and meanwhile the power rail glitch resistance is higher.

Description

technical field [0001] The invention relates to a power rail switching circuit, in particular to a power rail switching circuit utilizing positive feedback. Background technique [0002] At present, with the development of integrated circuits, there may be multiple signal power rails inside digital chips, and more and more analog circuits and digital circuits are integrated in the same chip. In analog circuits and digital, if there are multiple power rails for logic signals in the circuit, if there is no power rail switching, the power rails between the signals will be disordered, resulting in failure of the logic signals; if there is no power rail between the analog circuit and the digital circuit The switching of the ground terminal voltage easily causes the noise between the analog ground and the digital ground to influence each other, thus easily causing the logic signal to be erroneously reversed. Therefore, a power rail switching circuit is required to switch the powe...

Claims

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Application Information

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IPC IPC(8): H03K17/16
CPCH03K17/165
Inventor 王东俊邓乐武张雷刘明川何谟谞
Owner CHENGDU AIRCRAFT INDUSTRY GROUP