Reset circuit

A reset circuit and reset signal technology, applied in the direction of electrical components, electronic switches, pulse technology, etc., can solve the problems of great impact, low power supply voltage, and inability to reset integrated circuit chips, so as to ensure effective reset and reduce impact Effect

Active Publication Date: 2012-03-21
SHANGHAI FUDAN MICROELECTRONICS GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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[0028] In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar promotions without departing from the connotation of the present invention. Accordingly, the present invention is not limited by the specific embodiments disclosed below.

[0030] image 3 It is a schematic diagram of the reset circuit of the first embodiment of the present invention, such as image 3 As shown, the reset circuit includes a voltage dividing unit 201, a voltage detecting unit 202 and an output unit 203,

[0031] The voltage divi...

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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...

Claims

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Application Information

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IPC IPC(8): H03K17/14H03K17/16H03K17/22
Inventor 关锐
Owner SHANGHAI FUDAN MICROELECTRONICS GROUP
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