A charge pump circuit system

Abstract

A charge pump circuit system comprises two or more charge pumps. When the charge pumps are positive-pressure charge pumps, the charge pump circuit system further comprises a first current source circuit and first external circuits corresponding to the positive-pressure charge pumps one to one. The first external circuits comprise first N-type MOS tubes with sources grounded and first high-voltage switch tubes. The input end of a first current source in the first current source circuit is connected with a high electric level and the output end of the first current source in the first current source circuit is connected with drains of second N-type MOS tubes and grids of the second N-type MOS tubes. Grids of the first N-type MOS tubes are connected with the grids of the second N-type MOS tubes and the sources of the first N-type MOS tubes are connected with sources of the second N-type MOS tubes. When the charge pumps are negative-pressure charge pumps, the charge pump circuit system further comprises a second current source circuit and second external circuits corresponding to the negative-pressure charge pumps one to one. The second external circuits comprise first P-type MOS tubes with sources connected with a high electric level and second high-voltage switch tubes. The output end of a second current source in the second current source circuit is grounded, and the input end of the second current source in the second current source circuit is connected with sources of second P-type MOS tubes and grids of the second P-type MOS tubes. The sources of the first P-type MOS tubes are connected with the sources of the second P-type MOS tubes and grids of the first P-type MOS tubes are connected with the grids of the second P-type MOS tubes.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a charge pump circuit system. Background technique [0002] In many systems / chips, a charge pump (Pump) circuit is required. Taking Flash memory as an example, in order to complete various required operations, such as programming (Program), erasing (Erase), reading (Read), etc., it is necessary to use a positive charge pump (Positive Pump) and a negative charge pump (Negative Pump) circuit, including a variety of charge pump circuits. [0003] In a system where several different charge pumps coexist, there is an easily overlooked phenomenon that can cause serious harm. Since the output voltage of these charge pumps is usually high voltage, positive high voltage (much higher than the power supply voltage) or negative high voltage, it needs to go through a high voltage path (such as a series of HV Switch high voltage switches) before it can be transmitted to other circuit parts that need ...

AI Technical Summary

Problems solved by technology

Therefore, when these charge pumps stop working and start discharge (discharge), if the discharge speed is different, the capacitive coupling (couple) phenomenon will occur, so that the pump output voltage is coupled to a higher or lower voltage, these undesirable Higher voltage / lower voltage will cause serious harm to the high-voltage path behind, and even break down and destroy the devices in the high-voltage path. This is a situation we should try our best to avoid

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