Low-power and high-output voltage charge pump

Abstract

The invention discloses a low-power and high-output voltage charge pump. The output voltage amplitude can be digitally controlled. The circuit comprises a bias circuit, a digital-to-analogue conversion circuit, a charge pump main body circuit and a digital I<2>C circuit, which are sequentially connected, wherein the digital I<2>C circuit is connected with the digital-to-analogue conversion circuit; the charge pump main body circuit comprises a clock oscillator and charge pump units; the charge pump units are sequentially cascaded; an analogue voltage generated by the digital-to-analogue conversion circuit is simultaneously taken as a working voltage of the clock oscillator and an input voltage of the first stage of charge pump unit; the clock oscillator generates two groups of non-overlapping clocks; the first group of non-overlapping clocks are connected with a switch of each charge pump unit; and the second group of non-overlapping clocks are connected to terminals among various stages of charge pump units through capacitors C among the pumps respectively. By the low-power and high-output voltage charge pump, a relatively high output voltage is achieved; the output voltage is adjustable; the circuit structure is simplified; the power consumption is reduced; charges are transferred by creatively adopting a forward conduction mode of an MOS tube drain-substrate diode; and the stabilization time of a system is greatly reduced.

Description

technical field [0001] The invention relates to a charge pump, in particular to a charge pump with low power consumption and high output voltage. Background technique [0002] A charge pump is a circuit that generates a high DC voltage from a low voltage. Charge pumps are widely used in many circuit systems, for example: non-volatile memory requires higher voltage than conventional circuits, volatile memory requires high voltage to achieve faster operating speed, LCD screen requires high voltage to control contrast etc. [0003] In recent years, the rapid development of portable battery-driven consumer electronics has put forward higher requirements on the power consumption of the charge pump. As integrated circuit technology continues to advance, supply voltages continue to shrink with typical dimensions, making it increasingly difficult to generate higher bias voltages. Therefore, it is particularly important to design a charge pump circuit with low power consumption an...

AI Technical Summary

Problems solved by technology

As integrated circuit technology continues to advance, supply voltages continue to shrink with typical dimensions, making it increasingly difficult to generate higher bias voltages

Images