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

Abstract

The invention provides a fast power-down signal detection circuit and a power-on reset device for detecting power supply voltage jitter, including an edge generation circuit that senses power supply voltage jitter and generates a spike signal, receives the spike signal and outputs a fast power-down signal The fast power-down signal generation circuit, the fast power-down signal generation circuit includes a latch, the output point of the falling edge signal is passed through the capacitor C 6 The Ns point of the gate of the first-stage inverter connected to the latch, the output point of the rising edge signal is passed through the capacitor C 5 The s point of the output of the first-stage inverter connected to the latch, and the Ns point outputs the fast power-down signal. Through the power supply voltage jitter detection, an effective long-term reset signal is generated, and the power-down detection of the 10ns level can be realized at the fastest.

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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