Charge pump output voltage regulation circuit

Abstract

The invention discloses a charge pump output voltage regulation circuit, which regulates the output voltage of a charge pump so as to generate a required stable voltage value. The voltage regulation circuit comprises a CMOS phase inverter unit and a PMOS transistor, wherein the CMOS phase inverter unit receives a clock input signal from the charge pump and feeds the inverted clock input signal back to the charge pump; and a source electrode of the PMOS transistor is coupled with the input voltage of the charge pump, a grid electrode of the PMOS transistor is coupled with a feedback signal of the output voltage of the charge pump, and a drain electrode of the PMOS transistor is connected with the power input end of the charge pump and the CMOS phase inverter unit. The mode reduces the introduction of an additional analog circuit, reduces the complexity of the circuit and improves the stability of the circuit.

Description

technical field [0001] The invention relates to the field of charge pumps, in particular to a charge pump output voltage regulation circuit. Background technique [0002] A charge pump is a capacitive voltage converter that can be used to step up or down a voltage, or to generate a negative voltage. Because of its simple circuit and high efficiency, it is widely used in integrated circuits powered by a single power supply. For example, in Electrically Erasable Programmable Read-Only Memory (EEPROM) or Flash Memory (Flash Memory), the charge pump converts the power supply voltage into a high voltage signal higher than the power supply voltage to drive the write operation of the load, PROM or FlashEPROM. [0003] However, the output voltage generated by the charge pump without any restrictions often deviates from the required value, so the voltage regulation circuit is often set to clamp its output voltage at the required value, and at the same time, the charge pump has A ce...

AI Technical Summary

Problems solved by technology

[0005] Although the above prior art realizes the adjustment of the output voltage, it needs to use a discharge circuit or an additional reference voltage generating circuit, and the circuit structure is complicated and increases the area of ​​the chip.

Moreover, the introduction of these analog circuits will produce the phenomenon that the circuit characteristics change with the process and temperature. This unstable factor also brings challenges to the accuracy of the charge pump output voltage.

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