Patent ID: 9065392
Filing Date: 2015-06-23
Classification: H02M,H03F

Abstract:
1. A method achieving high power conversion efficiency of ground-centered charge pumps and minimizing output impedance on both outputs to achieve good load regulation, wherein both positive and negative output voltages have an equally divided output voltage compared to an input voltage VDD of the charge pump, wherein the equally divided output voltages comprise +/−VDD/2 and +/−VDD/3 voltages, the method comprising the steps of: (1) providing a ground-centered charge pump, a switching network, a port for positive output voltage (VPOS), a port for negative output voltage (VNEG), and at least one flying capacitor; (2) reducing number of switching states of the switching network to two states; (3) reducing the time required for transition through all switching states; and (4) maintaining constant flying capacitor voltages in all switching states.