Charge pump circuit working at extra low voltage

Abstract

The invention discloses a charge pump circuit working at extra low voltage, comprising a common-source common-body body drive current mirror, a first operational amplifier and a second operational amplifier, wherein the common-source common-body body drive current mirror consists of a first N-type MOS tube, a second N-type MOS tube, a third N-type MOS tube, a fourth N-type MOS tube, a first P-type MOS tube, a second P-type MOS tube, a third P-type MOS tube and a fourth P-type MOS tube, the second N-type MOS tube and the fourth N-type MOS tube not only realize the function of pulling down current tubes, but also realizes the function of pulling down the MOS tubes; the second P-type MOS tube and the fourth P-type MOS tube not only realize the function of pulling up the current tubes, but also realizes the function of pulling up the MOS tubes, thereby realizing the parallel connection relation of an MOS switch function and a current mirror function. The goal of increasing gains is achieved through the two operational amplifiers, i.e. the output resistance of the common-source common-body current mirror can be increased under low supply voltage.

Description

technical field [0001] The invention relates to the field of charge pump circuits, in particular to a charge pump circuit operating at extremely low voltage. Background technique [0002] Phase-locked loop (Phase-Locked Loop, PLL) has unique frequency multiplication and phase-locking functions, and has been widely used in wireless communication, clock recovery and other systems. With the further development of CMOS technology scaling down, integrated circuits (Integrated Circuits, IC) will enter the nanometer size, which increases the density of functional modules, the speed of devices and the ability of circuits to process signals. However, in order to satisfy reliability and avoid problems such as breakdown, hot carrier effect, and excessive power consumption density, its operating voltage is also proportionally reduced. Traditional analog circuits are usually designed for higher supply voltages, and many devices need to be cascaded. The supply voltage is gradually reduc...

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem that the traditional charge pump circuit works under extremely low voltage, the present invention adopts the body-driven current mirror structure, and the gate of the current mirror is controlled by the control signal, thereby realizing the parallel relationship between the MOS tube function and the current mirror function

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