Charge pump circuit

Abstract

The invention provides a charge pump circuit which comprises a plurality of filtering capacitors and a plurality of spare charge pumps. Each spare charge pump is respectively connected with one or multiple filtering capacitors to charge up the filtering capacitors. As the filtering capacitors are adopted, the capacitance value of each filtering capacitor is smaller than the sum of the whole filtering capacitance values. According to the principle that the smaller the capacitance value is, the shorter the time for charging up the capacitor voltage to the preset value is, the charge pump circuit can quickly charge up the capacitor voltage to the preset value, and the raising time is short.

Description

technical field [0001] The invention relates to the field of semiconductors, in particular to a charge pump circuit. Background technique [0002] The charge pump circuit is widely used in chips such as memory, and usually provides high voltage for the data operation of the chip, that is, converts the low voltage signal input into the charge pump circuit into a high voltage signal. [0003] figure 1 The shown structure is an existing charge pump circuit 10, including a charge pump 11, a filter capacitor (C filter ) 12. Load capacitance (C load )13 and load current structure (I load ) 14; wherein the charge pump 11 includes a signal input terminal 110, a control input terminal 111 and a signal output terminal 112, and the signal output terminal 112 is connected to C filter 12. [0004] figure 2 The waveform shown is figure 1 The waveform of the control signal Web of the charge pump circuit 10 and the waveform of the output high voltage signal HV are combined figure ...

AI Technical Summary

Problems solved by technology

[0009] but due to image 3 C in the shown structure filter Capacitor values ​​of 13 are usually large, so while with figure 2 Compared to the shown structure, image 3 The structure shown can further reduce the rise time, but the reduction is limited, and it is necessary to precisely control the phases of the control signals of each backup charge pump 31 to make them match, so as to prevent the control signals of each backup charge pump 31 from mismatching. The problem that the charging process of each backup charge pump 31 does not match and the ripple increases

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