Quick power-down signal detection circuit and power-on reset device for detecting power supply voltage jitter

Abstract

The invention provides a quick power-down signal detection circuit and a power-on reset device for detecting power supply voltage jitter. The quick power-down signal detection circuit includes: an edge generating circuit which is used for sensing voltage jitter of a power supply and generating a peak signal; a quick power-down signal generation circuit which is used for receiving the peak signal and outputting a quick power-down signal, wherein the quick power-down signal generation circuit comprises a latch, wherein an output point of the falling edge signal is connected to an Ns point of a grid electrode of a first-stage phase inverter of the latch through a capacitor C6, an output point of the rising edge signal is connected to an s point output by the first-stage phase inverter of thelatch through a capacitor C5, and the Ns point outputs the fast power-down signal. Through power supply voltage jitter detection, an effective long-time reset signal is generated, and 10ns-level powerfailure detection can be realized at the soonest.

Description

technical field [0001] The invention relates to the technical fields of large-scale integrated circuits and power supply management, in particular to a fast power-down signal detection circuit and a power-on reset device for detecting power supply voltage jitter. Background technique [0002] When powering an electronic system, it takes time for the supply voltage to stabilize. In this transient period when the power supply voltage is stable, if the system is not reset by the trigger of the reset signal, for example, the initial state of the digital register and the analog integrator cannot be defined, that is, the circuit is in an unknown state, so the behavior of the entire circuit cannot be defined. Sure. Therefore, these circuits need a certain command signal to initialize the circuit during or after power-on, and this command signal is power-on reset (POR). The POR signal is supposed to hold the circuit in reset until the power supply reaches a steady state level wher...

AI Technical Summary

Problems solved by technology

[0004] The best current technology can achieve the fastest detection speed of the power supply voltage jitter is 1ms. When the power supply voltage jitter speed is faster than 1ms, the reset signal cannot be generated, which cannot meet the design requirements.

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