Reset circuit

Abstract

The invention relates to a reset circuit, which comprises a voltage distribution unit, a voltage detection unit and an output unit; the voltage distribution unit comprises a first PMOS (P-channel Metal Oxide Semiconductor) tube and a first NMOS (N-channel Metal Oxide Semiconductor) tube; the threshold voltage of the first NMOS tube is smaller than the absolute value of the threshold voltage of the first PMOS tube; the grid electrode of the first PMOS tube is grounded, the source electrode of the first PMOS tube is connected with power source and the drain electrode of the first PMOS tube is connected with that of the first NMOS tube; the grid electrode and the drain electrode of the first NMOS tube are connected with each other, the source electrode of the first NMOS tube is grounded and the drain electrode of the first NMOS tube outputs a first control signal; the voltage detection unit comprises a first CMOS (Complementary Metal Oxide Semiconductor) phase inverter which receives thefirst control signal and outputs a second control signal; and the output unit comprises a first phase inverter which receives the second control signal and outputs a first reset signal. The reset circuit effectively reduces influence of the technology and the temperature on the reset voltage threshold, and ensures effective resetting of an integrated circuit chip.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a novel reset circuit. Background technique [0002] Nowadays, integrated circuits develop very rapidly, and for integrated circuits, especially digital integrated circuits, reset is one of the essential functions. The function of the reset circuit is to initialize the integrated circuit, so as to eliminate the chaotic state of the circuit caused by the power-on of the integrated circuit or the fluctuation of the power supply. [0003] The existing reset circuit usually consists of a voltage divider unit and a voltage detection unit, such as figure 1 As shown, the voltage dividing unit is composed of resistors R1 and R2, and the divided voltage The voltage detection unit is composed of a resistor R3 and an NMOS transistor MN1. The working principle of the reset circuit is as follows: when starting to power on, the power supply voltage Vdd is relatively low, and th...

AI Technical Summary

Problems solved by technology

[0005] To sum up, in the reset circuit of the prior art, the process and temperature have a great influence on the reset voltage threshold, so that the power supply voltage when the reset signal is generated is low or high, and the integrated circuit chip cannot be effectively reset.

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