Charge pump circuit and operating method thereof

Abstract

The invention provides a charge pump circuit and an operation method thereof. The circuit comprises a flying capacitor connected between a first node and a second node; n-stage charging circuits, wherein each stage of the n-stage charging circuits comprises a first switch of which one end is connected with a first node and the other end is connected with a third node; a second switch, wherein oneend of the second switch is connected with a second node, the other end of the first-stage second switch is connected with a ground end, and the other ends of the rest-stage second switches are connected with a third node; a charging capacitor connected between the third node and the ground end; and a buffer, wherein the positive input end of the buffer is connected with reference voltage, and thenegative input end is connected with the output end and connected with the third node of the mth-stage charging circuit. The period of a control clock adopted by the first switch and the second switch of the mth stage is 1 / (n-1) of the period of the control clocks of other stages, the control clocks from the (m+1) th stage to the nth stage are sequentially delayed by 1 / (n-1) period phases, and the control clock of the mth stage of the first stage is sequentially delayed by 1 / (n-1) period phases with the nth stage as the starting point.

Description

technical field [0001] The present application relates to the field of an integrated circuit, and further relates to a charge pump circuit and an operation method thereof. Background technique [0002] A charge pump has the function of providing a voltage higher than the power supply, and at the same time occupies a small space and has high efficiency, so it is widely used in integrated circuits. The charge pump circuit structure commonly used in the prior art is to set a capacitor and a MOS switch tube, and through the conduction and disconnection of the MOS switch tube, the capacitor is continuously switched between the two states of charging and discharging, so as to realize the charge pump output high voltage output. When a higher multiple voltage needs to be multiplied, more current will be consumed, resulting in high circuit power consumption and low efficiency. Contents of the invention [0003] The purpose of the present application is to provide a charge pump ci...

AI Technical Summary

Problems solved by technology

When it is necessary to multiply the voltage with a higher multiple, it needs to consume more current, and the circuit consumes high power consumption and low efficiency.

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