HIGHLY ACCURATE POWER-ON RESET CIRCUIT WITH LEAST DELAY

摘要

A power-on reset (POR) circuit for generating a POR signal includes a current source to generate an input current. The input current is a supply voltage dependent current. The POR circuit includes a first diode operable to receive the input current to output a first voltage signal. The first diode is electrically connected in series with a resistor. Further, the POR circuit includes a second diode operable to receive the input current to output a second voltage signal. Further, the POR circuit includes a comparator operable to receive the first voltage signal and the second voltage signal to generate the POR signal at a predefined trip point. The predefined trip point is a point at which the first voltage signal equals the second voltage signal. Furthermore, the POR circuit includes a temperature compensation circuit to compensate for the variation of the predefined trip point.

主权项

1. A power-on reset (POR) circuit for generating a POR signal, the POR circuit comprising:
a current source to generate an input current, wherein the input current is a supply voltage dependent current; a first diode operable to receive the input current to output a first voltage signal, wherein the first diode is electrically connected in series with a resistor; a second diode operable to receive the input current to output a second voltage signal; a comparator operable to receive the first voltage signal and the second voltage signal to generate the POR signal at a predefined trip point, wherein the predefined trip point is a point at which the first voltage signal equals the second voltage signal; and a temperature compensation circuit to compensate for the variation of the predefined trip point, wherein the predefined trip point is temperature dependent.