Power-on reset signal generator and related electronic device

Abstract

The invention discloses a power-on reset signal generator and a related electronic device. The power-on reset signal generator comprises a detection circuit and a comparator. The detection circuit detects a power supply voltage to generate a set of detection signals, and includes: a plurality of sets of transistors stacked and coupled between the power supply voltage and a ground voltage, each setof transistors including a first transistor and a second transistor respectively located in a first current path and a second current path; the first resistor and the second resistor are coupled between the two groups of transistors and are respectively positioned on the first current path and the second current path; and a third resistor coupled between the power supply voltage and the pluralityof groups of transistors. The comparator receives the set of detection signals from the detection circuit and compares the set of detection signals to generate a power-on reset signal. The power-on reset signal generator has the advantages that the power-on reset signal generator has high-precision control, and particularly, a voltage detection point VPOR required when a power-on reset signal isgenerated is irrelevant to temperature and a manufacturing process.

Description

technical field [0001] The present invention relates to power-on control, in particular to a power-on reset (POR) signal generator and related electronic devices. Background technique [0002] When powering up an electronic system, it takes a certain length of time for the power supply to stabilize the voltage and reach its steady state value. During such transitions, if no reset command is provided, it is generally not possible to define the initial state of the storage elements and thus the circuit behavior of the entire electronic system. According to the related art, a command signal for circuit initialization, such as a power-on reset signal, is generally required during or after power-on. The power-on-reset signal should keep the circuit in reset until the power supply reaches a steady-state voltage level, such as a level at which all circuits operate normally. [0003] There are still certain problems in such an architecture. For example, the voltage level of a cer...

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Problems solved by technology

During such transitions, if no reset command is provided, it is generally not possible to define the initial state of the storage element and thus the circuit behavior of the entire electronic system

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