Charge pump circuit capable of preventing overshooting and being started fast and overshooting preventing and fast starting method thereof

Abstract

The invention discloses a charge pump circuit capable of preventing overshooting and being started fast and a fast overshooting preventing starting method of the charge pump circuit. The charge pump circuit comprises a boost control circuit, a standard reference voltage source circuit, a feedback circuit, a fast starting reference voltage source circuit, a time-delay circuit and a switching circuit. Under an FF process angle, the time needed by standard reference voltages to reach a stable amplitude is T0, and the amplitude of temporary reference voltages obtained after starting within T0 at any moment is smaller than the stable amplitude of the standard reference voltages; under an SS process angle, the amplitude of the temporary reference voltages after starting within T0 is larger than that of the standard reference voltages at the same moment. The temporary reference voltages are adopted by the switching circuit as reference voltages to be output within T0, the standard reference voltages are adopted by the switching circuit as the reference voltages to be output after T0, output voltage overshooting under the condition of high power voltages and the FF process angle can be restrained, the starting speed of a charge pump under the condition of low power voltages and the SS process angle can be improved, and the convergence performance of the output voltages is good.

Description

technical field [0001] The invention relates to the field of charge pumps, in particular to an anti-overshoot and fast-start charge pump circuit and an overshoot-proof fast start method for feedback charge pumps under wide power supply voltage operating conditions. Background technique [0002] Charge pumps are widely used in power supply, memory, and radio frequency chips. Different chip applications have different requirements for charge pumps; some require large current output capabilities, some require accurate output voltage, and some require fast Boot speed. In some applications, the start-up speed of the charge pump is very important, and it needs to reach a predetermined voltage value within a certain time after start-up. Considering the influence of power supply voltage, process angle, temperature and other factors, the general charge pump output voltage at start-up It will be distributed in a large voltage range for a short time. For the feedback regulated charge...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to aim at the defects of the prior art that the above-mentioned accelerated start-up speed in the case of low power supply voltage and SS process corner is prone to output voltage overshoot in the case of high power supply voltage and FF process corner , providing an overshoot-proof and fast-start charge pump circuit and an overshoot-proof fast-start method for a feedback charge pump under wide power supply voltage operating conditions

Images