Voltage stabilizer of charge pump

Abstract

The invention is a charge pump voltage stabilizer. The charge pump outputs a voltage according to a clock signal. The voltage stabilizer includes voltage-stabilizing capacitors, one end of each of which coupled with the output end of the charge pump and the other end receiving the reverse clock signal.

Description

technical field [0001] The present invention relates to a voltage stabilizing device, and in particular to a voltage stabilizing device for a charge pump. Background technique [0002] A charge pump can be used to boost the voltage. For example, in a rewritable flash memory, a low voltage is generally required for reading, such as 3V, and a high voltage is required for writing, such as 12V. However, the power supply voltage of a general integrated circuit chip is usually not high, such as 3V. If a working voltage greater than 3V is required, such as 12V, a charge pump can be used to increase the DC voltage. [0003] Traditional charge pumps include two-phase (2phase), four-phase (4phase) and so on. Here, a two-phase charge pump is taken as an example for illustration. figure 1 It is a schematic diagram of a traditional two-phase charge pump circuit. The two-phase charge pump 100 includes diodes D1, D2, D3, D4, capacitors C1, C2 and C3. For the convenience of description...

AI Technical Summary

Problems solved by technology

If the difference between the upper and lower output voltage Vo is serious, it may be about 1V, so that the actual output voltage waveform has a slight ripple and is not ideal.

Images