Reset circuit

Abstract

A reset circuit includes a coupling circuit, a control circuit, a discharge circuit and a trigger, the coupling circuit is connected with a direct current voltage and the control circuit and is equipped with a control node which outputs a control voltage; the input end of the trigger is connected with the control circuit, and the trigger is used for receiving a trigger signal to start the reset function. The discharging circuit comprises a bias module and a voltage control module connected with the bias module. The bias module and the voltage control module are connected with the control node;and the control voltage is coupled with the direct current voltage through the coupling circuit, so that the control circuit outputs the trigger signal to the trigger. The voltage control module is used for discharging the control voltage so as to enable the control circuit to output another signal to complete a reset function, and the bias module is used for providing a bias voltage to the control node so as to ensure the discharging time of the control voltage.

Description

technical field [0001] The invention relates to a reset circuit, in particular to a reset circuit inside a chip. Background technique [0002] General integrated circuits are roughly divided into digital circuits and analog circuits. Many digital circuits often include the function of a state machine (State-machine), so a circuit that gives an initial state is required during chip startup. On the other hand, many analog circuits have a minimum operating voltage limit (headroom), and in In the process of starting the power supply, if the voltage is abnormal, the analog circuit will cause abnormally high current due to abnormal operation, which may cause the chip to burn out in severe cases. Therefore, in order to prevent the above events from happening, there needs to be a start-reset circuit inside the chip to prevent the chip from being damaged. Contents of the invention [0003] In view of the above situation, it is necessary to provide a reset circuit that can prevent...

AI Technical Summary

Problems solved by technology

Many digital circuits often include the function of a state machine (State-machine), so a circuit that gives an initial state is required during chip startup. On the other hand, many analog circuits have a minimum operating voltage limit (headroom), and in In the process of starting the power supply, if it is under abnormal voltage, the analog circuit will cause abnormally large current due to abnormal operation, which may cause the chip to burn out in severe cases

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