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Circuit and method for generating power-supply initial reset signal

A technology for resetting signals and generating circuits, used in electrical components, electronic switches, pulse technology, etc.

Active Publication Date: 2007-09-05
HOLTEK SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this power supply initial reset signal generation circuit can avoid the situation that the power supply initial reset signal fails due to the noise on the power supply voltage Vdd, it makes it easy for the power supply to switch between different power supply voltages and cannot really go through the reset stage. situation

Method used

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  • Circuit and method for generating power-supply initial reset signal
  • Circuit and method for generating power-supply initial reset signal
  • Circuit and method for generating power-supply initial reset signal

Examples

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Embodiment Construction

[0047] Please refer to FIG. 5 , which is a schematic circuit diagram of a first embodiment of a power reset signal generation circuit according to the present invention. The power supply reset signal generation circuit 30 includes a first stage circuit 30' and a second stage circuit 30", as shown in Figure 6 and Figure 7 respectively, wherein the first stage circuit 30' is a delay circuit, including A first limited charge path circuit 31 , a first capacitor C1 , a first limited discharge path circuit 32 , a first buffer B1 and a second limited discharge path circuit 33 .

[0048] The first limited charging path circuit 31 receives a power supply voltage Vdd and outputs a first charging current I1 , and only the first charging current I1 flows through the first limited charging path circuit 31 . In this embodiment, the first limited charging path circuit 31 includes a first NMOS (N-channel metal-oxide-semiconductor) transistor N1 and a first PMOS (P-channel metal-oxide-semicond...

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PUM

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Abstract

The invention comprises a delay circuit and a second level circuit of an output circuit. The delay circuit delays a power reset signal of output circuit used for switching a non-active level state into an active level state. Charging and discharging paths are set in both delay circuit and output circuit, which can normally generate reset signals when it is used in the power having all kind of upward speeds, existed with positive and negative wave nosed and having switching voltage.

Description

technical field [0001] The present invention relates to a power supply initial reset signal generation circuit and method, in particular to a power supply initial reset signal generation circuit and method with anti-noise ability and ability to adapt to slowly rising power supply voltage. Background technique [0002] All kinds of electronic devices need power supply to operate, so they also have their power-related circuits. In order to meet general needs, the power supply in the electronic device often has a reset function to allow users to perform soft and hard boots on the electronic device. Resetting a computer is one example. Wherein, soft boot refers to that the electronic device receives a power initial reset signal and resets under the condition of power supply, and hard boot refers to that the electronic device receives a power initial reset signal after its power is forcibly turned off. is turned on, wherein the initial reset signal of the power supply does not r...

Claims

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Application Information

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IPC IPC(8): H03K17/22H03K17/28
Inventor 廖俊尧陈郁仁
Owner HOLTEK SEMICON
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