Novel power-on reset circuit

Abstract

The invention discloses a novel power-on reset circuit. The power-on reset circuit generates reset signals inside a chip and is very important to the normal work of the chip. The novel power-on reset circuit can precisely detect various power voltages without an external voltage reference or generating an inner band-gap reference, overcomes the defects that a traditional power-on reset circuit needs an accurate reference voltage provided by the outside, is greatly promoted in performance compared with the traditional power-on reset circuit, and has low power consumption and temperature coefficient and small process change.

Description

technical field [0001] The invention relates to a power-on reset circuit. Background technique [0002] The power-on reset circuit generates a reset signal inside the chip, which is crucial to the normal operation of the chip. In 2004, W.C.Yen et al. introduced their research in an academic paper titled "A precision CMOS power-on reset circuit with power noise immunity for low-voltage technology" published in "IEICE Trans. Electron" A power-on reset circuit based on the Kuijk bandgap reference, such as figure 1 As shown, the principle is to detect whether the difference between the power supply voltage VDD and the voltage Vb at point b is higher than the bandgap reference voltage. Since Vb is grounded, it can be regarded as Vb=0, that is, to detect whether the power supply voltage VDD is higher than the bandgap reference voltage. Since the voltage difference between the emitter and the base of the triode and the voltage drop of the diode have the same negative temperature ...

AI Technical Summary

Problems solved by technology

[0003] The above two circuits based on the Kuijk bandgap reference voltage have the advantages of simple circuit structure and small deviation with temperature and process. The disadvantage is that the detected power level is fixed at the bandgap reference voltage

However, in general applications, the power level is determined according to other circuit requirements, so the above circuit cannot meet this requirement

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