Current biasing circuit for fast wake-up of the chip

Abstract

The invention provides a current bias circuit for quickly waking up a chip, which belongs to the technical field of integrated circuits. The current bias circuit includes a bias current generating circuit, a low-precision bias current generating circuit, and a current output branch, and also includes an additional switch circuit; the additional switch circuit is arranged between the bias current generating circuit and the current Between the output branches, it is used to pull down the potential of the operating point of the current output branch instantaneously during the process of the current bias circuit from being turned off to on, so as to quickly open the current output branch to output the Bias current generating circuit generates bias current. The present invention pulls down the potential of the working point of the current output branch instantaneously through an additional switch circuit in the process of the current bias circuit from being turned off to on, so as to quickly open the current output branch to output the bias current, thereby quickly starting the chip All kinds of key circuits can wake up the chip quickly, which solves the problem of long wake-up time of the chip.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a current bias circuit for quickly waking up a chip. Background technique [0002] Most chips used in the Internet of Things, industrial control, communication and other fields need to have multiple working modes to meet the low power consumption requirements in battery-powered and wireless power supply scenarios. Most of the time the chip is in sleep mode, and most circuits in the chip are turned off to reduce power consumption and loss. When the chip is triggered by a wake-up source, it enters the normal working state, and re-enters the sleep state after completing related tasks to save power consumption. When the chip wakes up, its internal voltage reference, oscillator circuit, clock circuit, phase-locked loop and other high-precision circuits need accurate bias current when starting from the off state, and the bias circuit that generates the bias current also ne...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a current bias circuit for quickly waking up the chip to quickly start the key circuits in the chip, thereby solving the problem of long wake-up time of the chip

Images