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Starting-up reset circuit

A technology for resetting circuits and voltage comparators, which is applied to electrical components, electronic switches, pulse technology, etc., and can solve the problem that the signal processing system 6 cannot start to operate from a predetermined state.

Active Publication Date: 2012-12-12
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will cause the signal processing system 6 to fail to operate from the predetermined state, resulting in unexpected problems

Method used

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  • Starting-up reset circuit
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Embodiment Construction

[0032] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings.

[0033] refer to image 3 , the preferred embodiment of the power-on reset circuit 1 of the present invention is suitable for being arranged in an electronic system 100 , including a voltage comparator 11 , a clamping signal generator 12 and a judger 13 electrically connected to each other. The voltage comparator 11 is an analog circuit (that is, in an analog form), and is controlled by an operating voltage VDD to send out a trigger signal. Clamping signal generator 12, which is a digital circuit (i.e. in digital form), generates a clamping signal according to the trigger signal, and the judger 13 will determine the potential of a reset signal based on the trigger signal and the clamping signal, and then drive the electronic A processing circ...

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Abstract

The invention relates to a starting-up reset circuit which comprises a voltage comparer, a clamp signal generator and a judger, wherein the voltage comparer is used for outputting a trigger signal according to a working voltage; the clamp signal generator is coupled to the voltage comparer and used for generating a clamp signal according to the potential conversion of the trigger signal, the clamp signal generator comprises a feedback unit and an output unit, wherein the feedback unit is used for generating a feedback signal according to the trigger signal or the clamp signal; the output unitis used for updating the clamp signal according to the feedback signal; and the judger is coupled to the voltage comparer and the clamp signal generator and used for outputting a reset signal according to the trigger signal and the clamp signal.

Description

technical field [0001] The invention relates to a signal generation technology, in particular to a power-on reset circuit for generating a reset signal. Background technique [0002] Generally speaking, a signal processing system often needs to rely on a reset signal for initialization, so as to definitely start the system from a predetermined state to achieve desired performance. [0003] Common reset signal generation methods are mostly presented by analog circuits. figure 1 This is one example. figure 1 The power-on reset circuit 7 includes a resistor 71 , a capacitor 72 and a comparator 73 . A working voltage VDD charges the capacitor 72 through the resistor 71 . Until the voltage across the capacitor 72 is greater than a reference voltage, the comparator 73 turns a reset signal from low to high, thereby driving the digital signal processing system 6 from the initial mode to the operation mode. On the other hand, when the working voltage VDD is removed, the capacitor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/22
Inventor 周裕彬张贤钧吴文哲
Owner REALTEK SEMICON CORP