Boost Charge Pump

Abstract

The invention discloses a boosting charge pump. The boosting charge pump comprises at least one first charge drawing unit, a second charge drawing unit and an output storage capacitor, wherein the first charge drawing unit comprises a first charge pump capacitor, a first output P-channel metal oxide semiconductor (PMOS) transistor and at least one charging clock signal end; the second charge drawing unit comprises a second charge pump capacitor, a second output PMOS transistor and at least one charging clock signal end; the first output PMOS transistor and the second output PMOS transistor interact with each other and are respectively turned on or off according to a charging clock signal, so that the first charge pump capacitor and the second charge pump capacitor periodically charge the output storage capacitor. By ingenious connection between the output PMOS transistors in each charge drawing unit, the design complexity is effectively reduced, the same output voltage performance is obtained, and requirements of design key points are effectively met; the output storage capacitor is charged in a period for at least two times. Compared with a conventional structure, the structure of the boosting charge pump has the advantages that the ripple is much smaller; better output characteristics are obtained.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a boost type charge pump with simple structure and excellent performance. Background technique [0002] Charge pump circuits are widely used in analog circuits, which are mainly composed of capacitors, switches, non-overlapping clocks and level conversion circuits, the most important of which are the realization of capacitors and switches. Existing simple charge pumps such as figure 1 As shown, it is implemented by using capacitors and diodes, and ck1 and ck2 are a pair of non-overlapping clocks. The working principle of the charge pump is as follows: Assuming that the conduction voltage of the diode is vt, when ck1=0, D1 conducts, and in steady state, va=vin-vt; when ck1=vin, ck2=0, va=2vin-vt , At the same time, D2 is turned on, and vb=2vin-2vt in steady state. In this way, the voltages of va, vb, and vcp are gradually raised, and the number of capacitors and diodes ...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a step-up charge pump to solve the problem that the design of the charge pump in the prior art needs a

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