Boosting clock circuit and charge pump with same

Abstract

A boosting clock circuit comprises N stages of single-stage boosting clock circuits (CK_BST 1-CK_BST N) in a cascading connection manner, wherein at least one stage of single-stage boosting clock circuit is connected with a comparison selection circuit, the power supply voltage VDD' of all single-stage boosting clock circuits is the same, and the boosting clock circuit is characterized in that the at least one comparison selection circuit is connected with a tracking circuit; the input voltage VIN of the tracking circuit and the power supply voltage VDD' of the ingle-stage boosting clock circuit meet the following relation: VIN=F (VDD'), wherein N is an integral number larger than or equal to 1, and F is a fixed function. A charge pump circuit comprises a charge pump and the boosting clock circuit with the tracking circuit and the comparison selection circuit, wherein the boosting clock circuit charges the charge pump. The boosting clock circuit and the charge pump circuit overcome the problems that the traditional boosting clock circuit with the comparison selection circuit, and the charge pump circuit have large errors in the practical application, and can better meet the requirement of practical application.

Description

technical field [0001] The invention belongs to the technical field of charge pumps, in particular to a boost clock circuit and a charge pump with the boost clock circuit. Background technique [0002] A charge pump, also known as a switched capacitor voltage converter, is a DC-DC (DC-DC) converter that uses "flying" or "pumping" capacitors to store energy. The charge pump can make the input voltage Raised or lowered, can also be used to generate negative voltages. Traditional charge pumps control the charging and discharging of flying capacitors to multiply or reduce the input voltage by a certain factor (0.5, 2 or 3) to obtain the required output voltage. [0003] At present, commonly used charge pumps have a boost clock circuit. The input clock signal CK and the reverse clock signal CKB are boosted by the boost clock circuit and output as the clock signal CKO and the reverse clock signal CKOB; the corresponding high-low level difference VH of the clock signal CK and the...

AI Technical Summary

Problems solved by technology

[0010] However, in actual circuits, the boost clock circuit has factors that change its boost characteristics, such as various parasitic capacitances, environmental factors such as temperature and humidity

Direct detection of the power supply voltage VDD' or the change of the input voltage VIN that has a fixed corresponding relationship with the power supply voltage VDD' cannot completely and directly reflect the voltage change of the actual boost clock circuit, because the actual circuit is not considered at this time. Various parasitic capacitances, environmental factors such as temperature and humidity

Therefore, directly detecting the change result of the supply voltage VDD' or the input voltage VIN that has a fixed corresponding relationship with the supply voltage VDD' to select the size of the charging capacitor of each single-stage boost clock circuit has a large error in actual circuit applications.

Images